191
191
Jun 1, 2010
06/10
by
Ivanov, K. G
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Earth electric induction current effect on size and form of midnight magnetic storms
Topics: ELECTRIC CURRENT, INDUCTION, MAGNETIC SIGNATURES, MAGNETIC STORMS, NIGHT, ELECTRIC CURRENT,...
We investigate numerically the electric and the magnetic response of the split-ring resonators (SRRs) for different electromagnetic (EM) field polarization and propagation directions. We have studied the current density J of circular and rectangular SRRs at THz frequencies. At low frequencies, J is confined to the edges of the SRRs, while at high frequencies J is all over the width of the wire. The diamagnetic response of the SRRs is also examined. Finally, the role of losses and the magnetic...
Topics: DTIC Archive, AMES LAB IA, *RESONATORS, POLARIZATION, MAGNETIC RESONANCE, MAGNETIC SIGNATURES, LOW...
278
278
May 23, 2011
05/11
by
Rothermel, Jeffry; Chambers, Diana M.; Jarzembski, Maurice A.; Srivastava, Vandana; Bowdle, David A.; Jones, William D
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Two continuous-wave(CW)focused C02 Doppler lidars (9.1 and 10.6 micrometers) were developed for airborne in situ aerosol backscatter measurements. The complex path of reliably calibrating these systems, with different signal processors, for accurate derivation of atmospheric backscatter coefficients is documented. Lidar calibration for absolute backscatter measurement for both lidars is based on range response over the lidar sample volume, not solely at focus. Both lidars were calibrated with a...
Topics: MAGNETIC FIELD CONFIGURATIONS, POLARITY, HEATING, MAGNETIC FIELDS, MAGNETIC SIGNATURES, MAGNETIC...
233
233
Sep 20, 2010
09/10
by
Homaifar, Abdollah; Mccormick, E
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This paper examines the applicability of genetic algorithms (GA) in the complete design of fuzzy logic controllers. While GA has been used before in the development of rule sets or high performance membership functions, the interdependence between these two components dictates that they should be designed together simultaneously. GA is fully capable of creating complete fuzzy controllers given the equations of motion of the system, eliminating the need for human input in the design loop. We...
Topics: FORCE-FREE MAGNETIC FIELDS, MATHEMATICAL MODELS, SOLAR CORONA, SOLAR MAGNETIC FIELD, BOUNDARY...
Simultaneous observations are presented from the S3-A (Explorer 45) satellite of the magnetic signature of the ring current and complete measurements of the proton ring current to distances of 5.24 R sub E during the double magnetic storm of 16 to 19 December 1971.
Topics: NASA Technical Reports Server (NTRS), MAGNETIC SIGNATURES, PROTONS, RING CURRENTS, EXPLORER...
The dielectric properties of soils and plastic targets are given. The approach for finding exact pole locations from a dielectric infinite slab, a dielectric sphere, and a dielectric infinite cylinder is presented (and applied). The exact poles for the slab and sphere are found for various sizes and dielectric properties. There is a discussion (and use) of Carl E. Baum's perturbation formulas for dielectric slabs and spheres. George Hanson's results (formulas, from using Carl's same approach)...
Topics: DTIC Archive, Worthy, Mark C., PHILLIPS LAB KIRTLAND AFB NM, *DIELECTRIC FILMS, PERTURBATIONS, SOIL...
Identifying magnetic signatures that result from unexploded ordnance (UXO) is complicated by the dipolar nature of the signatures themselves and the presence of non-target-generated magnetic fluctuations. Fluctuations in the magnetic field that result from naturally occurring geologic materials, for example, often obscure the signatures from UXO. The presence of metallic debris or shrapnel can also degrade, mask, or complicate analysis. To improve and automate the analysis of magnetic data, a...
Topics: DTIC Archive, AETC INC RALEIGH NC, *EXPLOSIVES DETECTION, *UNEXPLODED AMMUNITION, ALGORITHMS,...
198
198
May 22, 2011
05/11
by
Bourbakis, N. G.; Maas, M.; Tascillo, A.; Vandewinckel, C
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ODYSSEUS is an autonomous walking robot, which makes use of three wheels and three legs for its movement in the free navigation space. More specifically, it makes use of its autonomous wheels to move around in an environment where the surface is smooth and not uneven. However, in the case that there are small height obstacles, stairs, or small height unevenness in the navigation environment, the robot makes use of both wheels and legs to travel efficiently. In this paper we present the detailed...
Topics: DATA REDUCTION, MAGNETOMETERS, SOLAR INSTRUMENTS, SOLAR OBSERVATORIES, TELESCOPES, COMPUTER...
The magnetic mineralogy and magnetic signature of banded ion formations, diagenetic (unmetamorphosed) and low grade banded iron formations, high-grade mineralogy, and phase equilibria of magnetite inorogenic magmers are discussed.
Topics: NASA Technical Reports Server (NTRS), FORMATIONS, MAGNETIC ANOMALIES, MAGNETIC SIGNATURES, MAGMA,...
266
266
May 24, 2011
05/11
by
NON
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Summary of research/publications include:(1) Comment on broadening of water microwave lines by collisions with helium atoms; (2) Calculations of ion-molecule deuterium fractionation reactions involving HD; (3) Ab initio predictions on the rotational spectra of carbon-chain carbene molecules; (4) Theoretical IR spectra of ionized naphthalene; (5) Improved collisional excitation rates for interstellar water; (6) Calculations on the competition between association and reaction for C3H H2; (7)...
Topics: MAGNETIC FIELD RECONNECTION, CONVECTION, MAGNETIC SIGNATURES, SOLAR FLARES, PHOTOSPHERE, SOLAR...
An objective method of inferring the polarity of the interplanetary magnetic field using the H-component at Godhavn is presented. The objectively inferred polarities are compared with a subjective index inferred earlier. It is concluded that no significant difference exists between the two methods. The inferred polarities derived from Godhavn H is biased by the (slp) sub q signature in the sense that during summer prolonged intervals of geomagnetic calm will result in inferred Away polarity...
Topics: NASA Technical Reports Server (NTRS), INTERPLANETARY MAGNETIC FIELDS, MAGNETOMETERS, POLARITY,...
This is the final report for Phase II of a three phase project. In this three phase project, we are integrating inexpensive, easily deployable magnetic measurement systems into small autonomous underwater vehicles (AUVs). These AUVs are being trained to work together to assess the magnetic signature of a forward deployed ship or submarine. This assessment is important to establish a vehicle's stealth condition relative to potential threats. Navy vessels, including submarines, go through a...
Topics: DTIC Archive, IDAHO UNIV MOSCOW CENTER FOR INTELLIGENT SYSTEMS RESEARCH, *MAGNETIC SIGNATURES,...
The regional gravity and magnetic features of the South Indian Shield were discussed. The prominent regional gravity low of 20 to 30 mgls over the charnockite terrain of South India, coupled with the correlation of a steep gravity gradient with a prominent shear zone to the north, can be interpreted in terms of increased crustal thickness in the South Indian high-grade terrain. There is some support for this from deep seismic sounding. The magnetic signature of the high-grade terrain is also...
Topics: NASA Technical Reports Server (NTRS), EARTH CRUST, GEOPHYSICS, INDIA, MAGNETIC SIGNATURES,...
A large surge was observed on September 17, 1971 part of which, after travelling 200,000 km across the surface, returned to the surface to form a filament. The filament lasted about 30 minutes, then rose up and returned to the source of the surge. This was interpreted as the filling of a semi-stable magnetic trap. Analysis of the microwave radio burst showed it to have been produced by a source optically thick at 8,800 MHz, with area 4 (arc min)squared and T approximately 275,000 deg, N squared...
Topics: NASA Technical Reports Server (NTRS), SOLAR ATMOSPHERE, SOLAR SPECTRA, ELECTROMAGNETIC SPECTRA,...
Magnetic susceptibility and magnetization data are presented for Nd2- xCexCuO4-sigma system. The Nd-local moments are seen to be crucial in interpreting the magnetic response. Evidence for a pervasive diamagnetic component (onsetting near 24K) in the low field response which is sharply maximized near x=0.16 is presented. Keywords: Electron-doped superconductor, Diamagnetic, Hystersis loop.
Topics: DTIC Archive, Liang, G, RUTGERS - THE STATE UNIV NEW BRUNSWICK NJ DEPT OF CHEMISTRY, *MAGNETIC...
Imaging of weak magnetic fields at ambient temperatures and pressures with submicron spatial resolution and wide field of view is an outstanding challenge of great importance in both the physical and life sciences. A robust instrument able to image such magnetic fields will have wide-ranging and far-reaching applications in science and technology, including: minimally-invasive imaging of functional activity and magnetic structures in living cells; imaging and detection of magnetically-labeled...
Topics: DTIC Archive, QUANTUM DIAMOND TECHNOLOGIES INC CAMBRIDGE MA, *MAGNETIC DETECTION, CANCER, COLOR...
Using NSO/KP magnetograms, the pattern and rate of the emergence of magnetic flux and the development of the large-scale patterns of unipolar fields are considered in terms of the solar magnetic cycle. Magnetic flux emerges in active regions at an average rate of 2 x 10(exp 21) Mx/day, approximately 10 times the estimated rate in ephemeral regions. Observations are presented that demonstrate that the large-scale unipolar fields originate in active regions and activity nests. For cycle 21, the...
Topics: NASA Technical Reports Server (NTRS), MAGNETIC FLUX, SOLAR CYCLES, SOLAR MAGNETIC FIELD, DIPOLE...
This report provides a description of the NASA Marshall Space Flight Center's Solar Vector Magnetograph Facility and gives a summary of its observations and data reduction during January to December 1987. The systems that make up the facility are a magnetograph telescope, an H-alpha telescope, a Questar telescope, and a computer code. The data are represented by longitudinal contours with azimuth plots.
Topics: NASA Technical Reports Server (NTRS), OPTICAL EQUIPMENT, RESEARCH FACILITIES, SOLAR OBSERVATORIES,...
This manual for use of the magnetograph program describes: (1) black box use of the programs; (2) the magtape data formats used; (3) the adjustable control parameters in the program; and (4) the algorithms. With no adjustments on the control parameters this program may be used purely as a black box. For optimal use, however, the control parameters may be varied. The magtape data formats are of use in adopting other programs to look at raw data or final magnetograph data.
Topics: NASA Technical Reports Server (NTRS), DENSITOMETERS, MAGNETOMETERS, RECORDING INSTRUMENTS, USER...
During the reporting period 1 Jul. - 31 Dec. 1991, work continued in each of the major areas of study proposed for this project: analysis of radially polarized pulsations; impulse event studies; and radial boundaries of Pc 3-4 pulsations in the dayside magnetosphere.
Topics: NASA Technical Reports Server (NTRS), EARTH MAGNETOSPHERE, MAGNETIC FIELDS, POLARIZED ELASTIC...
A description is provided of the NASA-Marshall's Solar Vector Magnetograph Facility and a summary of its observations and data reduction during January to December 1989 is given. The systems that make up the facility are a magnetograph telescope, and H-alpha telescope, a Questar telescope, and a computer code. The data are represented by longitudinal contours with azimuth plots.
Topics: NASA Technical Reports Server (NTRS), COMPUTER PROGRAMS, MAGNETIC SIGNATURES, MAGNETOMETERS, SOLAR...
449
449
May 23, 2011
05/11
by
Zhang, Zhon
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The development of large-scale, composite software in a geographically distributed environment is an evolutionary process. Often, in such evolving systems, striving for consistency is complicated by many factors, because development participants have various locations, skills, responsibilities, roles, opinions, languages, terminology and different degrees of abstraction they employ. This naturally leads to many partial specifications or viewpoints. These multiple views on the system being...
Topics: LUNAR TOPOGRAPHY, PLANETARY MAPPING, VALLEYS, CALDERAS, STRESSES, MATHEMATICAL MODELS, CORONAS,...
This report investigates identical model small arms, in particular eight same-model pistols and seven same-model shotguns. This is an adjunct to experiments to obtain statistically significant quantities of signatures of objects of military interest. Magnetic signature features were compared to find similarities and differences between all the pistols and all the shotguns tested. In the far field region, the shapes of the component curves for each weapon were similar; the relative shapes of the...
Topics: DTIC Archive, ARMY RESEARCH LAB ADELPHI MD SENSORS AND ELECTRON DEVICES DIRECTORATE, *SMALL ARMS,...
OBJECTIVE: To investigate the relationship between magnetic field gradients and cell-material interactions using integrated experimental and computational approaches in a multidisciplinary effort; to develop an experimental system to create magnetized structures for examining cell interactions; to examine the magnetic response of surfaces through a computational analysis approach; to probe the response of Magnetospirillum magneticum to localized magnetic fields with cell-material interactions;...
Topics: DTIC Archive, CARNEGIE-MELLON UNIV PITTSBURGH PA, *MAGNET COILS, *MAGNETIC FIELDS, *MAGNETIZATION,...
A new algorithm was developed, tested, and applied to determine coronal magnetic fields above solar active regions. The coronal field above NOAA active region AR5747 was successfully estimated on 20 Oct. 1989 from data taken at the Mees Solar Observatory of the Univ. of Hawaii. It was shown that observational data can be used to obtain realistic estimates of coronal magnetic fields. The model has significantly extended the realism with which the coronal magnetic field can be inferred from...
Topics: NASA Technical Reports Server (NTRS), ALGORITHMS, SOLAR CORONA, SOLAR FLARES, SOLAR MAGNETIC FIELD,...
Under the educational Resident Research Associateships (RRA) program, NASA Headquarters funds post-doctoral research scientists through a contract with the National Research Council (NRC). This short article reviews the important influence that the RRAs have had on solar research at NASA s Marshall Space Flight Center (MSFC). Through the RRA program the National Research Council under the National Academy of Sciences has provided the Marshall Space Flight Center s Solar Physics Group with 29...
Topics: NASA Technical Reports Server (NTRS), MAGNETIC SIGNATURES, X RAY TELESCOPES, SOLAR INSTRUMENTS,...
Flux Transfer Events (FTEs) are magnetopause signatures that result from the passage of flux ropes produced by transient bursts of reconnection. They exhibit bipolar signatures in the component of the magnetic field normal to the magnetopause and transient increases or crater-like structures in the magnetic field strength. We use the bipolar magnetic field signatures and magnetic field strength variations observed by all four Cluster spacecrafts during the years of 2002 and 2003 to determine...
Topics: NASA Technical Reports Server (NTRS), FLUX TRANSFER EVENTS, MOTION, MAGNETOPAUSE, MAGNETIC...
Observations and studies of solar magnetic fields that were carried out during the period of the solar maximum year (SMY) January 1980 to June 1981, are reviewed with the goal of providing a summary of what was learned about solar magnetic fields during the SMY. Such subjects as the relationship between solar magnetic fields and flares, the role of magnetic fields in the sunspot phenomenon, the magnetic-canopy structure overlying the supergranular network as well as the turbulent magnetic...
Topics: NASA Technical Reports Server (NTRS), SOLAR ACTIVITY, SOLAR FLARES, SOLAR MAGNETIC FIELD, SUN,...
We have measured the meridional motions of magnetic elements observed in the photosphere over sunspot cycles 23 and 24 using magnetograms from SOHO/MDI and SDO/HMI. Our measurements confirm the finding of Komm, Howard, and Harvey (1993) that the poleward meridional flow weakens at cycle maxima. Our high spatial and temporal resolution analyses show that this variation is in the form of a superimposed inflow toward the active latitudes. This inflow is weaker in cycle 24 when compared to the...
Topics: NASA Technical Reports Server (NTRS), MERIDIONAL FLOW, SUNSPOT CYCLE, HIGH RESOLUTION, MAGNETIC...
Long-wavelength, relative high amplitude-magnetic anomalies obtained at satellite altitudes have provided an understanding of the nature of the deeper crust of the Earth. We have studied one such long-wavelength (19 nT positive, -6 nT negative) feature on the Canada Basin continental margin in the Northwest and Yukon Territories, Canada. This area is also the focus of significant stress and earthquake activity. We interpret this anomaly and associated tectonic activity with this region's...
Topics: NASA Technical Reports Server (NTRS), CANADA, MAGNETIC ANOMALIES, EARTHQUAKES, TECTONICS, MAGNETIC...
In simple terms the corrosion related magnetic (CRM) field arises due to the flow of corrosion currents through the sea water. This current density has many sources with one of the most prominent being the currents that arise due to the corrosion of the metal work of the ship. Various corrosion countermeasures, for example an impressed current cathodic protection (ICCP) system, also directly affect the current density and hence an accurate model of the electromagnetic signatures can provide...
Topics: DTIC Archive, DEFENCE RESEARCH AND DEVELOPMENT ATLANTIC DARTMOUTH (CANADA), *CORROSION, *MAGNETIC...
This paper presents a simple and efficient algorithm for deriving images of polarity inversion from NSO/Kitt Peak magnetograms without use of contouring routines and shows by example how these maps depend upon the spatial scale for filtering the raw data. Smaller filtering scales produce many localized closed contours in mixed polarity regions while supergranular and larger filtering scales produce more global patterns. The apparent continuity of an inversion line depends on how the spatial...
Topics: NASA Technical Reports Server (NTRS), BIPOLARITY, SUN, SOLAR OBSERVATORIES, ALGORITHMS, MAGNETIC...
The determination of coronal magnetic fields from vector magnetograms, including the development and application of algorithms to determine force-free coronal fields above selected observations of active regions is studied. Two additional active regions were selected and analyzed. The restriction of periodicity in the 3-D code which is used to determine the coronal field was removed giving the new code variable mesh spacing and is thus able to provide a more realistic description of coronal...
Topics: NASA Technical Reports Server (NTRS), FORCE-FREE MAGNETIC FIELDS, MATHEMATICAL MODELS, SOLAR...
Magnetic signature measurements of tanks at Aberdeen, MD, are taken that effectively measure the vertical field in a plane below the tank at points spaced 1 ft apart in a 20 x 40 ft grid. By use of a discrete Fourier series expansion, the measurements A(pq) are extended to arbitrary points within the area by R(uv) where R(pq) = A(pq) for integer p,q. This extension allows one to compare sets of measurements that are slightly shifted with respect to one another. Formulas are given by which one...
Topics: DTIC Archive, Karayianis, Nick, HARRY DIAMOND LABS ADELPHI MD, *FOURIER SERIES, *MAGNETIC...
A description of the NASA Marshall Space Flight Center's Solar Vector Magnetograph Facility is presented and a summary of its observations and data reduction is given. The systems that make up the facility are a magnetograph telescope, an H alpha telescope, a Questar telescope, and a computer code. The data are represented by longitudinal contours with azimuth plots.
Topics: NASA Technical Reports Server (NTRS), COMPUTER PROGRAMS, H ALPHA LINE, MAGNETIC SIGNATURES, SOLAR...
Dangerous space weather is driven by solar flares and Coronal Mass Ejection (CMEs). Forecasting flares and CMEs is the first step to forecasting either dangerous space weather or All Clear. MAG4 (Magnetogram Forecast), developed originally for NASA/SRAG (Space Radiation Analysis Group), is an automated program that analyzes magnetograms from the HMI (Helioseismic and Magnetic Imager) instrument on NASA SDO (Solar Dynamics Observatory), and automatically converts the rate (or probability) of...
Topics: NASA Technical Reports Server (NTRS), SPACE WEATHER, WEATHER FORECASTING, MAGNETIC SIGNATURES,...
A computer program and procedure for plotting the contour of the data transferred from the Marshall Space Flight Center solar magnetography is presented. The plotted data then can be easily compared with solar data from other sources, such as the Solar Maximum Mission. From the data file for circular polarization the longitudinal program plots the contours for filtered longitudinal plot and intensity plot by choosing the positive and negative contour levels, intensity levels, and also X,Y...
Topics: NASA Technical Reports Server (NTRS), COMPUTER PROGRAMS, MAGNETIC SIGNATURES, SOLAR MAGNETIC FIELD,...
The 1/R3 sensitivity of total field magnetometers makes them highly sensitive to nearby ferrous metal, including that of a towing vehicle. The magnetic signature of a vehicle varies primarily with the orientation of the vehicle in the Earth's magnetic field. It also varies with the orientation of the sensor array relative to the tow vehicle (eg. in a tight turn). In addition, if the vehicle signature is very high and / or the sensor array is very close, small changes in vehicle pitch and roll...
Topics: DTIC Archive, SCIENCE APPLICATIONS INTERNATIONAL CORPORATION NEWTON MA, *HIGH SENSITIVITY, *TOWING...
This program was initiated to investigate the potential of nuclear magnetic resonance (NMR) for remote detection. Remote regions accessible from only one side and the remote detection of explosives were topics of particular interest. The program involved the following seven specific tasks and subtasks: (1) to identify the compounds of interest, both benign and explosive; (2) to locate and catalog available data on the compounds of interest; (3) to review current remote NMR technology; (4) to...
Topics: DTIC Archive, Burnett, L J, SAN DIEGO STATE UNIV CA, *EXPLOSIVES, NUCLEAR MAGNETIC RESONANCE,...
The Ordinary High Water Mark (OHWM) is a method used to identify the lateral limits of non-wetland waters. Lichvar and McColley (2008) developed an OHWM delineation manual for ephemeral and intermittent streams in the Arid West. Their approach identified key hydrologic, geomorphic, and vegetation indicators useful in OHWM delineation. This technical note provides an updated datasheet to the manual. The datasheet has been simplified but still includes the overall field signatures and preliminary...
Topics: DTIC Archive, COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER NH, *FLOOD PLAINS, *ARID LAND,...
This ASSERT grant was to support the Ph.D. work of Tom Spirock who is a native of New Jersey. Tom will finish his Ph.D. this year, thanks in large part to ASSERT support. His work was to build an infrared magnetograph and use it for scientific work. Solar magnetic fields are concentrated in flux tubes, and appear on different scales: sunspots, pores (small sunspots without penumbra) and magnetic network flux elements. The magnetic network elements are the detritus of decaying active regions and...
Topics: DTIC Archive, Goode, Philip, BIG BEAR SOLAR OBSERVATORY BIG BEAR CITY CA, *MAGNETIC FIELDS,...
A videomagnetograph patterned after the BBSO system was installed at Huairou in 1987, and five days of coordinated observing were carried out from September 24 to 29, 1987. The data were combined to make a continuous movie of the fields abound a stable spot. A 57 hour magnetograph run with two seven hour gaps were achieved from 2330 UT, September 24 to 0830 UT, September 27. The frames were reregistered and justified to eliminate the change of scale with meridian distance. The intensities were...
Topics: NASA Technical Reports Server (NTRS), FACULAE, MAGNETIC FIELDS, MAGNETIC SIGNATURES, VIDEO DATA,...
This report provides a description of the NASA Marshall Space Flight Center's Solar Vector Magnetograph Facility and gives a summary of its observations and data reduction during July-December 1992. The systems that make up the facility are a magnetograph telescope, an H-alpha telescope, a Questar telescope, and a computer code.
Topics: NASA Technical Reports Server (NTRS), COMPUTER PROGRAMS, DATA REDUCTION, MAGNETIC SIGNATURES,...
Work under the subject grant began in August 1992, when Mr. J. J. Blanchette began study and data analysis in the area of solar flare research. Mr. Blanchette passed all requirements toward a Ph.D., except for the thesis. Mr. Blanchette worked with the APL Flare Genesis Experiment team to build a balloon-borne solar vector magnetograph. Other work on the magnetograph was partially supported by AFOSR grant F49620-94-1-0079. Mr. Blanchette assisted the Flare Genesis team prepare the telescope and...
Topics: DTIC Archive, Rust, David M., JOHNS HOPKINS UNIV LAUREL MD APPLIED PHYSICS LAB, *SOLAR FLARES,...
The differential affine velocity estimator (DAVE) that we developed in 2006 for estimating velocities from line-of-sight magnetograms is modified to directly incorporate horizontal magnetic fields to produce a differential affine velocity estimator for vector magnetograms (DAVE4VM). The DAVE4VM's performance is demonstrated on the synthetic data from the anelastic pseudospectral ANMHD simulations that were used in the recent comparison of velocity inversion techniques by Welsch and coworkers....
Topics: NASA Technical Reports Server (NTRS), CORRELATION DETECTION, MAGNETIC FIELDS, MAGNETIC SIGNATURES,...
This report provides a description of the NASA Marshall Space Flight Center's Solar Vector Magnetograph Facility and gives a summary of its observations and data reduction during January-June 1993. The systems that make up the facility are a magnetograph telescope, an H-alpha telescope, a Questar telescope, and a computer code.
Topics: NASA Technical Reports Server (NTRS), COMPUTER PROGRAMS, DATA REDUCTION, MAGNETOMETERS, NASA...
A streamer puff is a recently identified variety of coronal mass ejection (CME) of narrow to moderate width. It (1) travels our along a streamer, transiently inflating the streamer but leaving it largely intact, and (2) occurs in step with a compact ejective flare in an outer flank of the base of the streamer. These aspects suggest the following magnetic-arch-blowout scenario for the production of these CMEs: the magnetic explosion that produces the flare also produces a plasmoid that explodes...
Topics: NASA Technical Reports Server (NTRS), BLOWOUTS, CORONAL MASS EJECTION, DIMMING, PLASMAS (PHYSICS),...
It has been known for decades that auroral substorm onset occurs on (or at least near) the most equatorward auroral arc, which is thought to map to the near geosynchronous region. The lack of auroral signatures poleward of this arc prior to onset has been a major criticism of flow-burst driven models of sub storm onset. The combined THEMIS 5 spacecraft in-situ and ground array measurements provide an unprecedented opportunity to examine the causal relationship between midtail plasma flows,...
Topics: NASA Technical Reports Server (NTRS), MAGNETOHYDRODYNAMIC FLOW, IN SITU MEASUREMENT, GEOMAGNETIC...
Using the Flare Genesis Experiment (FGE), a balloon-borne observatory with an 80-cm solar telescope we observed the active region NOAA 8844 on January 25, 2000 for several hours. FGE was equipped with a vector polarimeter and a tunable Fabry-Perot narrow-band filter. It recorded time series of filtergrams, vector magnetograms, and Dopplergrams at the Ca(I) 6122.2 angstrom line, and H-alpha filtergrams with a cadence between 2.5 and 7.5 minutes. At the time of the observations, NOAA 8844 was...
Topics: NASA Technical Reports Server (NTRS), MAGNETIC SIGNATURES, SUNSPOTS, SOLAR MAGNETIC FIELD, MAGNETIC...
This report details activities performed in order to accomplish the optical design of a balloon-borne solar vector magnetograph.
Topics: NASA Technical Reports Server (NTRS), BALLOON-BORNE INSTRUMENTS, DESIGN ANALYSIS, MAGNETIC...
