A Thermal nonthermal Approach to Solar Flares

A Thermal nonthermal Approach to Solar Flares
Author: Stephen G. Benka
Publsiher: Unknown
Total Pages: 116
Release: 1991
Genre: Solar flares
ISBN: NASA:31769000521115

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A Thermal Nonthermal Approach to Solar Flares

A Thermal Nonthermal Approach to Solar Flares
Author: National Aeronautics and Space Administration (NASA)
Publsiher: Createspace Independent Publishing Platform
Total Pages: 114
Release: 2018-07-17
Genre: Electronic Book
ISBN: 172291341X

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An approach for modeling solar flare high-energy emissions is developed in which both thermal and nonthermal particles coexist and contribute to the radiation. The thermal/nonthermal distribution function is interpreted physically by postulating the existence of DC sheets in the flare region. The currents then provide both primary plasma heating through Joule dissipation, and runaway electron acceleration. The physics of runaway acceleration is discussed. Several methods are presented for obtaining approximations to the thermal/nonthermal distribution function, both within the current sheets and outside of them. Theoretical hard x ray spectra are calculated, allowing for thermal bremsstrahlung from the heated plasma electrons impinging on the chromosphere. A simple model for hard x ray images of two-ribbon flares is presented. Theoretical microwave gyrosynchrotron spectra are calculated and analyzed, uncovering important new effects caused by the interplay of thermal and nonthermal particles. The theoretical spectra are compared with observed high resolution spectra of solar flares, and excellent agreement is found, in both hard x rays and microwaves. The future detailed application of this approach to solar flares is discussed, as are possible refinements to this theory. Benka, Stephen G. Goddard Space Flight Center CURRENT SHEETS; ELECTRON ACCELERATION; NONTHERMAL RADIATION; PLASMA HEATING; SOLAR FLARES; SOLAR RADIATION; SOLAR SPECTRA; SPACE PLASMAS; THERMAL RADIATION; BREMSSTRAHLUNG; CHROMOSPHERE; DISSIPATION; IMPINGEMENT; MICROWAVE SPECTRA; MICROWAVES; PLASMA CURRENTS; X RAY SPECTRA; X RAYS...

A Thermal nonthermal Approach to Solar Flares

A Thermal nonthermal Approach to Solar Flares
Author: Stephen G. Benka
Publsiher: Unknown
Total Pages: 116
Release: 1991
Genre: Solar flares
ISBN: UIUC:30112105097148

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NASA Technical Memorandum

NASA Technical Memorandum
Author: Anonim
Publsiher: Unknown
Total Pages: 478
Release: 1991
Genre: Aeronautics
ISBN: MINN:31951P00218514O

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Scientific and Technical Aerospace Reports

Scientific and Technical Aerospace Reports
Author: Anonim
Publsiher: Unknown
Total Pages: 508
Release: 1995
Genre: Aeronautics
ISBN: UVA:X004872569

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Literature 1991 Part 2

Literature 1991  Part 2
Author: Astronomisches Rechen-Institut
Publsiher: Springer Science & Business Media
Total Pages: 1592
Release: 2013-06-29
Genre: Science
ISBN: 9783662123768

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"Astronomy and Astrophysics Abstracts" appearing twice a year has become oneof the fundamental publications in the fields of astronomy, astrophysics andneighbouring sciences. It is the most important English-language abstracting journal in the mentioned branches. The abstrats are classified under more than a hundred subject categories, thus permitting a quick survey of the whole extended material. The AAA is a valuable and important publication for all students and scientists working in the fields of astronomy and related sciences. As such it represents a necessary ingredient of any astronomical library all over the world.

Monthly Catalogue United States Public Documents

Monthly Catalogue  United States Public Documents
Author: Anonim
Publsiher: Unknown
Total Pages: 1194
Release: 1993
Genre: Government publications
ISBN: UIUC:30112063914847

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Monthly Catalog of United States Government Publications

Monthly Catalog of United States Government Publications
Author: Anonim
Publsiher: Unknown
Total Pages: 1308
Release: 2024
Genre: Government publications
ISBN: WISC:89117117267

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