STUDY OF SOLAR ENERGETIC PARTICLE ASSOCIATIONS WITH CORONAL EXTREME-ULTRAVIOLET WAVES

• Published in: The Astrophysical journal Vol. 808; no. 1; pp. 1 - 10
• Main Authors: Park, Jinhye, Innes, D. E., Bucik, R., Moon, Y.-J., Kahler, S. W.
• Format: Journal Article
• Language: English
• Published: United States The American Astronomical Society 20-07-2015
• Subjects: ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; Channels; Coronas; Energetic particles; EXTREME ULTRAVIOLET RADIATION; Fluxes; HELIOSPHERE; MAGNETIC FIELDS; MASS; MEV RANGE; PHOTOSPHERE; Potential fields; SOLAR CORONA; SOLAR PARTICLES; SPACE VEHICLES; SPACE-TIME; Spacecraft; Spectra; SUN; Sun: activity; Sun: coronal mass ejections (CMEs); Sun: magnetic fields; Sun: particle emission; VELOCITY
• ISSN: 0004-637X; 1538-4357; 1538-4357
• DOI: 10.1088/0004-637X/808/1/3

ABSTRACT We study the relationship between large gradual solar energetic particle (SEP) events and associated extreme-ultraviolet (EUV) wave properties in 16 events that occurred between 2010 August and 2013 May and were observed by SDO, the Solar and Heliospheric Observatory (SOHO), and/or STEREO. We determine onset times, peak times, and peak fluxes of the SEP events in the SOHO/ERNE and STEREO/LET proton channels (6-10 MeV). The EUV wave arrival times and their speeds from the source sites to the spacecraft footpoints in the photosphere, which are magnetically connected to the spacecraft by Parker spiral and potential fields, are determined by spacetime plots from the full-Sun heliographic images created by combining STEREO-A and STEREO-B 195 Å and SDO 193 Å images. The SEP peak fluxes increase with the EUV wave speeds, and the SEP spectral indices become harder with the speeds. This shows that higher energetic particle fluxes are associated with faster EUV waves, which are considered as the lateral expansions of coronal-mass-ejection-driven shocks in the low corona.