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| Titel |
A Data-Driven Analytical Model for Proton Acceleration at Remotely Observed Low Coronal Shocks |
| VerfasserIn |
Kamen Kozarev, Nathan Schwadron |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250122085
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| Publikation (Nr.) |
 EGU/EGU2016-1022.pdf |
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| Zusammenfassung |
| We have recently studied the development of a large-scale off-limb coronal bright front
(OCBF) low in the solar corona (Kozarev et al., 2015), by using remote observations from the
Solar Dynamics Observatory’s Advanced Imaging Assembly EUV telescopes, combined with
several data-driven models. Similar to previous studies (Kozarev et al., 2011; Downs et al.,
2012), we determined that the observed feature is a driven magnetohydrodynamic (MHD)
wave, which steepens into a shock within the AIA field of view (FOV). In that study, we
obtained high-temporal resolution estimates of parameters of the OCBF, which
regulate the efficiency of acceleration of charged particles within the theoretical
framework of Diffusive Shock Acceleration (DSA). These parameters include the
time-dependent shock radius Rsh, speed V sh and strength r, as well as the upstream (in
the shock frame) potential coronal magnetic field orientations with respect of the
shock surface normal, θBN. Because of the very high cadence of the AIA telescope,
we were able to obtain estimates of these quantities for every 12 seconds of the
approximately 8 minutes, which the OCBF spent in the AIA field of view. Here
we present a simple analytical model for the particle acceleration from low in the
corona, which has been developed to incorporate the remotely observed OCBF
properties described above. We showcase the model by applying it to the event studied
in Kozarev et al. (2015), and show that it can produce significant increase in the
particle energies during the short passage of the OCBF in the AIA field of view. |
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