On the physical meaning of ndistributions in solar flares 

Marian Karlický Submitted: 20111229 00:28
Aims: We investigate the physical meaning of the ndistributions 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 particleincell code. Results: It is shown that the derived moving Maxwellian energy distribution is very similar to the ndistribution, especially in their highenergy parts. Both these distributions are mutually fitted and a relation between their parameters found. Contrary to the ndistribution, the moving Maxwellian distribution has a simple physical meaning, e.g., the electron component of the return current in the beamplasma 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 ndistribution, 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 ndistributions. Thus, our previous results connected with the ndistributions can be understood in a new, physically profound way.
Authors: M. Karlický, E. Dzifcakova, J. Dudik
Projects:

Publication Status: publushed in 2012, A&A 537, id. A36
Last Modified: 20111229 14:02


