Volume 580, August 2015
|Number of page(s)||7|
|Published online||21 July 2015|
Case studies of multi-day 3He-rich solar energetic particle periods
1 Max-Planck-Institut für Sonnensystemforschung, 37077 Göttingen, Germany
2 Applied Physics Laboratory, Johns Hopkins University, Laurel, MD 27023, USA
Received: 6 January 2015
Accepted: 13 May 2015
Context. Impulsive solar energetic particle events in the inner heliosphere show the long-lasting enrichment of 3He.
Aims. We study the source regions of long-lasting 3He-rich solar energetic particle (SEP) events
Methods. We located the responsible open magnetic field regions, we combined potential field source surface extrapolations with the Parker spiral, and compared the magnetic field of the identified source regions with in situ magnetic fields. The candidate open field regions are active region plages. The activity was examined by using extreme ultraviolet images from the Solar Dynamics Observatory (SDO) and STEREO together with radio observations from STEREO and WIND.
Results. Multi-day periods of 3He-rich SEP events are associated with ion production in single active region. Small flares or coronal jets are their responsible solar sources. We also find that the 3He enrichment may depend on the occurrence rate of coronal jets.
Key words: Sun: corona / Sun: UV radiation / Sun: radio radiation / solar-terrestrial relations
© ESO, 2015
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