Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsh22a..04a&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SH22A-04
Physics
2101 Coronal Mass Ejections (7513), 2114 Energetic Particles (7514), 2134 Interplanetary Magnetic Fields, 2139 Interplanetary Shocks
Scientific paper
On 2001 October 19--21 the Energetic and Relativistic Nuclei and Electron (ERNE) instrument on the Solar and Heliospheric Observatory (SOHO) observed two gradual solar energetic particle (SEP) events separated by 15 hours, in association with two X1.6/2B solar flares and halo coronal mass ejections (CMEs). The observation data suggests that the second acceleration of ~10--100 MeV protons occurred behind the first CME and the previous CME was not an obstacle for the new particles to directly access 1~AU. This observation calls into question the view that in all gradual events the high-energy particles are continuously produced at a CME bow shock as it travels from near Sun to beyond 1~AU. The data support an idea that the >10~MeV protons of the 2001 October 19 event were accelerated mainly within ~0.1~AU from the Sun and then temporarily confined in structured solar wind.
Al-Sawad Amjad
Kocharov Leon
Laitinen Timo
Saloniemi Oskari
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