Microwave signature of thick-target electron beams in solar flares

Details Microwave signature of thick-target electron beams in solar flares Microwave signature of thick-target electron beams in solar flares

Apr 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...279..882e&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 279, April 15, 1984, p. 882-895.

Astronomy and Astrophysics

Astrophysics

43

Electron Beams, Microwave Emission, Microwave Signatures, Plasma Radiation, Solar Electrons, Solar Flares, Solar Radio Emission, Coulomb Collisions, Electron Distribution, Ion Acoustic Waves, Plasma Turbulence, Relaxation (Mechanics)

Scientific paper

The steady-state behavior of a flux of nonthermal electrons injected into a fully ionized thick target is examined. Owing to the (inverse square) energy dependence of the Coulomb collisional cross section, it is found that injected electron distributions that are monotonically decreasing functions of electron energy develop at finite depths into distributions that have 'humps' in velocity space; the electron energy corresponding to the hump correlates with the overlying particle column density to the target. This results in a two-stream unstable situation. The distribution is constantly being relaxed by quasi-linear relaxation and re-created by collisions; in this way a steady nonthermal level of Langmuir plasma waves is created, and these waves in turn produce microwave plasma radiation with a typical flux of 3 x 10 to the -16th erg/sq cm-sec. This flux can be enhanced by a factor of up to 100 by a high level of low-frequency (such as ion-acoustic) turbulence, which prevents quasi-linear relaxation for a sufficient fraction of the path length.

Affiliated with

Also associated with

No associations

Rating

Microwave signature of thick-target electron beams in solar flares does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Microwave signature of thick-target electron beams in solar flares, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Microwave signature of thick-target electron beams in solar flares will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1498757