A Statistical Study of Spectral Hardening in Solar Flares and Related Solar Energetic Particle Events

Details A Statistical Study of Spectral Hardening in Solar Flares and Related Solar Energetic Particle Events A Statistical Study of Spectral Hardening in Solar Flares and Related Solar Energetic Particle Events

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009apj...707.1588g&link_type=abstract

The Astrophysical Journal, Volume 707, Issue 2, pp. 1588-1594 (2009).

Astronomy and Astrophysics

Astronomy

8

Sun: Flares, Sun: Particle Emission, Sun: X-Rays, Gamma Rays

Scientific paper

Using hard X-ray observations from the Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI), we investigate the reliability of spectral hardening during solar flares as an indicator of related solar energetic particle (SEP) events at Earth. All RHESSI data are analyzed, from 2002 February through the end of Solar Cycle 23, thereby expanding upon recent work on a smaller sample of flares. Previous investigations have found very high success when associating soft-hard-harder (SHH) spectral behavior with energetic proton events, and confirmation of this link would suggest a correlation between electron acceleration in solar flares and SEPs seen in interplanetary space. In agreement with these past findings, we find that of 37 magnetically well-connected flares (W30-W90), 12 of 18 flares with SHH behavior produced SEP events and none of 19 flares without SHH behavior produced SEPs. This demonstrates a statistically significant dependence of SHH and SEP observations, a link that is unexplained in the standard scenario of SEP acceleration at the shock front of coronal mass ejections and encourages further investigation of the mechanisms which could be responsible.

Affiliated with

Also associated with

No associations

Rating

A Statistical Study of Spectral Hardening in Solar Flares and Related Solar Energetic Particle Events does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with A Statistical Study of Spectral Hardening in Solar Flares and Related Solar Energetic Particle Events, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A Statistical Study of Spectral Hardening in Solar Flares and Related Solar Energetic Particle Events will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1882569