"Oblique" Bernstein modes in solar preflare plasma: Generation of second harmonics

Details "Oblique" Bernstein modes in solar preflare plasma: Generation of second harmonics "Oblique" Bernstein modes in solar preflare plasma: Generation of second harmonics

Feb 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012adspr..49..791k&link_type=abstract

Advances in Space Research, Volume 49, Issue 4, p. 791-796.

Physics

Scientific paper

Process of second harmonics generation due to development of corresponding instability has been investigated for pure electron weakly oblique Bernstein mode. This mode was supposed to be modified by taking into account the influence of pair Coulomb collisions and weak large-scale electric field in flare loop. Investigated area was located near the loop foot-point in the "lower-middle" chromosphere of active region. It has been shown, that for the Fontenla-Avrett-Loeser model of solar atmosphere the investigated process of second harmonics generation starts at the extremely low threshold values of subdreicer electric field, well before the beginning of "preheating" phase of flare process.

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