Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010apj...722.1577k&link_type=abstract
The Astrophysical Journal, Volume 722, Issue 2, pp. 1577-1588 (2010).
Astronomy and Astrophysics
Astronomy
4
Sun: Flares, Sun: Radio Radiation
Scientific paper
We investigate the spectra and polarization of the gyrosynchrotron microwave (MW) emission generated by anisotropic electron beams in the solar corona. The electron distributions are selected from the steady propagation/precipitation model of beam electrons obtained from the time-dependent solutions of the Fokker-Planck equation taking into account particle anisotropic precipitation into a converging magnetic tube while losing energy in collisions and Ohmic losses induced by a self-induced electric field. We separate the effects of converging magnetic field from those of self-induced electric field for beams with different initial energy fluxes and spectral indices. The effect of returning electrons of the beam is negligible for the beams with relatively weak energy fluxes (F <~ 1010 erg cm-2 s-1), while it becomes very important for the electron beams with F >~ 1012 erg cm-2 s-1. Electric field-induced losses lead to the increase of MW emission intensity, especially at larger viewing angles (θ >~ 140°, looking at the loop from a side). The polarization remains typical for the beam-like distributions. The combined effect of the self-induced electric field and converging magnetic field reveals a noticeable (up to a factor of 10) increase of the emission intensity (for the viewing angles θ ~= 140°-150°) in comparison with the models considering only collision factor, especially in the deeper precipitation layers (near the loop footpoints). Thus, considering the self-induced electric field is especially important for the resulting MW emission intensity, spectra shape, and polarization that can provide much closer correlation of simulations with observations in solar flares.
Kuznetsov Alexey A.
Zharkova Valentina V.
No associations
LandOfFree
Manifestations of Energetic Electrons with Anisotropic Distributions in Solar Flares. II. Gyrosynchrotron Microwave Emission 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 Manifestations of Energetic Electrons with Anisotropic Distributions in Solar Flares. II. Gyrosynchrotron Microwave Emission, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Manifestations of Energetic Electrons with Anisotropic Distributions in Solar Flares. II. Gyrosynchrotron Microwave Emission will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1405300