On the physical meaning of n-distributions in solar flares

Details On the physical meaning of n-distributions in solar flares On the physical meaning of n-distributions in solar flares

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012a%26a...537a..36k&link_type=abstract

Astronomy & Astrophysics, Volume 537, id.A36

Astronomy and Astrophysics

Astrophysics

2

Sun: Flares, Sun: X-Rays, Gamma Rays

Scientific paper

Aims: We investigate the physical meaning of the n-distributions detected in solar flares. Methods: We consider a Maxwellian velocity distribution with a velocity drift. This distribution is analytically integrated to obtain the energy distribution, and its stability is investigated numerically using a fully electromagnetic particle-in-cell code. Results: It is shown that the derived moving Maxwellian energy distribution is very similar to the n-distribution, especially in their high-energy parts. Both these distributions are mutually fitted and a relation between their parameters found. Contrary to the n-distribution, the moving Maxwellian distribution has a simple physical meaning, e.g., the electron component of the return current in the beam-plasma system. However, for high drift velocities of such a component, the moving Maxwellian distribution is unstable. Therefore to keep the form of this distribution similar to the n-distribution, some stabilization processes are necessary. If so, then the high intensities of the Si xiid 5.56 Å and 5.82 Å satellite lines and their evolution in solar flares can be explained by moving Maxwellian distributions instead of the n-distributions. Thus, our previous results connected with the n-distributions can be understood in a new, physically profound way.

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