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| Titel |
Electrons and protons acceleration during the first GLE event of solar cycle 24 |
| VerfasserIn |
Chuan Li, Kazi A. Firoz, Lingpeng Sun, I. Miroshnichenko Leonty |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250074423
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| Zusammenfassung |
| High-energy particles were recorded by the near-Earth spacecraft particle detectors and
ground-based neutron monitors (NMs) on 2012 May 17. This event was the first Ground
Level Enhancement (GLE) of solar cycle 24. In present study, we try to identify the
acceleration source of solar energetic particles (SEPs) by combining in-situ particle
measurements from WIND/3DP, ACE/EPAM, GOES, and solar cosmic rays (SCRs)
registered by several NMs, as well as the remote-sensing solar observations from SDO/AIA,
SOHO/LASCO, and RHESSI. We derive the path length (1.25 ± 0.05 AU) of SEPs
in the interplanetary magnetic field (IMF) and solar particle release (SPR) time
(01:29 ± 1 UT) of the first arriving electrons by using their velocity dispersion and
taking into account the contamination effects. It is found that the electrons impulsive
injection phase, indicated by the dramatic change of spectral index, is consistent with
the flare non-thermal emission and type III radio bursts. The potential field source
surface (PFSS) modeled open-field lines rooted in the active region (AR) provide
escaping channels for flare accelerated electrons. Meanwhile, relativistic protons are
found to be released ~10 min later than the electrons, assuming their scatter-free
travel along the same IMF path length. Combing multi-wavelength imaging data
on the prominence eruption and coronal mass ejection (CME), we obtain some
evidence of that GLE protons, with estimated kinetic energy of ~1.12 GeV, are
probably accelerated by the CME-driven shock when it travels to ~3.07 solar radii. |
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