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Titel |
On the role of slow mode shocks in the reconnection region for generating energetic electrons during solar flares |
VerfasserIn |
G. Mann, H. Aurass, H. Onel, A. Warmuth |
Konferenz |
EGU General Assembly 2012
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Medientyp |
Artikel
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Sprache |
Englisch
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Digitales Dokument |
PDF |
Erschienen |
In: GRA - Volume 14 (2012) |
Datensatznummer |
250059379
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Zusammenfassung |
A flare is defined as an sudden enhancement of the emission of electromagnetic radiation of
the Sun covering a broad range of the spectrum from the radio up to the gamma-ray
range. That indicates the generation of energetic electrons during flares, which
are considered as the manifestation of magnetic reconnection. According to this
model, the inflow region of the reconnection region is separated from the outflow one
by pairs of slow mode shocks. At them, the magnetic field energy is efficiently
annihilated and transfered into a strong heating of the outflow plasma leading to the
generation of energetic electrons as needed for the hard X-ray radiation at large
flares.
The slow mode shocks are studied in terms of the Rankine-Hugoniot relationships.
Especially, the jump of the temperature and the magnetic field across the shock is evaluated to
study the heating of the plasma in the outflow region. The resulting fluxes of energetic
electrons in the outflow region are calculated in a fully relativistic manner. Due to the strong
heating of the plasma at the slow mode shocks, electrons with energies > 40Â keV are
generated in the outflow region as needed for the hard X-ray radiation. The theoretically
obtained fluxes of energetic electrons agree well with those as measured by RHESSI satellite
during large flares. |
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