Why did the January 20 2005 GLE Have Such a Rapid Onset?

Details Why did the January 20 2005 GLE Have Such a Rapid Onset? Why did the January 20 2005 GLE Have Such a Rapid Onset?

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsh21a..05c&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #SH21A-05

Physics

2101 Coronal Mass Ejections (7513), 2111 Ejecta, Driver Gases, And Magnetic Clouds, 2114 Energetic Particles (7514), 2451 Particle Acceleration

Scientific paper

Three remarkable aspects of the January 20 2005 event are the rapid arrival of the high energy particles, their peak intensity, and the high speed of the associated coronal mass ejection. These characteristics might suggest that a strong shock formed very rapidly and accelerated the energetic particles. However, the associated meter to kilometer wavelength solar radio emissions are unremarkable with no clear early signature of a shock i.e. a metric type II burst. We investigate the proposal that the first arriving particles traversed an extremely quiet interplanetary medium within an interplanetary coronal mass ejection that originated less than 2 days earlier in the same active region as the January 20 event. Such a situation leads to good magnetic connection and minimal scattering.

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