Solar Radio Bursts and Energetic Particle Events

Details Solar Radio Bursts and Energetic Particle Events Solar Radio Bursts and Energetic Particle Events

Aug 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc.1039..190c&link_type=abstract

PARTICLE ACCELERATION AND TRANSPORT IN THE HELIOSPHERE AND BEYOND: 7th Annual International Astrophysics Conference. AIP Confer

Astronomy and Astrophysics

Astrophysics

1

Astronomical Observations, Particle Acceleration, Planetary Bow Shocks, Interplanetary Shocks, Gamma-Ray Sources, Gamma-Ray Bursts, Magnetohydrodynamics And Plasmas, X-Ray, Interplanetary Magnetic Fields

Scientific paper

The two basic types of particle acceleration at the Sun-a flare-resident process (or processes) and acceleration at coronal shock waves-were first identified in solar metric radio emissions through their associated type III bursts and type II bursts, respectively. A key question for solar energetic particle (SEP) physics today concerns the relative contributions of flares and shocks to large gradual SEP events, particularly at >30 MeV energies. We address this question by: (1) comparing low-frequency (~1 MHz) radio emissions for samples of the largest gradual and impulsive SEP events from cycle 23; and (2) determining SEP associations for a sample of large favorably-located low-frequency type III radio bursts. Our results indicate that a strong shock, as commonly manifested by a low-frequency (<14 MHz) type II burst, is a necessary condition for the occurrence of a large >30 MeV proton event. We propose a revision to the standard two-class paradigm for SEP events in which we subdivide the current gradual event class on the basis of shock geometry, i.e., quasi-parallel or quasi-perpendicular.

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