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The effects of electron beam induced electric field on the generation of Langmuir turbulence in flaring atmospheres View all abstracts by submitter

Valentina Zharkova   Submitted: 2011-03-16 08:15

The precipitation of an electron beam injected into the solar atmosphere is studied for generation of Langmuir wave turbulence in the presence of collisional and Ohmic losses. The system of quasi-linear time-dependent kinetic equations describing the evolution of beams and Langmuir waves is solved by using the summary approximation method. It is found that at upper atmospheric levels the self-induced electric field suppresses the generation of Langmuir turbulence to very small regions below injection. With further precipitation into deeper atmo- sphere the initial single power law distributions of beam electrons are transformed into energy distributions with maxima at lower energies formed by collisional and Ohmic energy depletion. The electrons with lower energies (<20 keV) generateon large spatial scales intense low-hybrid and high-hybrid Langmuir waves with well defined patterns in the corona while higher energy electrons generate moderate low hybrid waves in the chromosphere. The maximum wave density appears at the maximum of the ambient density. The self-induced electric field reduces the level and makes narrower the regions with low-hybrid Langmuir turbulence in the corona and upper chromosphere. The higher the beam energy flux, or its self-induced electric field, the narrower the regions with Langmuir turbulence. High hybrid Langmuir turbulence generated in a form of regular patterns in depth and electron energies is also reduced by electric field to smaller number of patterns shifted to smaller region in the upper corona.

Authors: Zharkova V.V. and Siversky T.V.
Projects: None

Publication Status: Astrophysical Journal, in press
Last Modified: 2011-03-16 15:12
Go to main E-Print page  Plasma heating in the very early and decay phases of solar flares  Short-term evolution of coronal hole boundaries  Edit Entry  Download Preprint  Submitter's Homepage Delete Entry 

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