Physics
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsh32b..04n&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #SH32B-04
Physics
7513 Coronal Mass Ejections, 7519 Flares, 7554 X Rays, Gamma Rays, And Neutrinos
Scientific paper
We review the properties of X-class flares as observed by Yohkoh in the present solar cycle. More than a half of about four dozen X-class flares were caught by Yohkoh from an early phase. Most of these flares have durations not as long as long decay events (LDEs), and yet their association with coronal mass ejections (CMEs) is very high. They often correspond to extended or halo events. The flares not associated with CMEs do not show ejecta in soft X-rays. The flare core usually shows compact morphology. Within the sensitivity of the Yohkoh Hard X-ray Spectrometer, the hard X-ray spectra extend to the MeV range only in 20% of these flares, and their temporal variations are typically soft-hard-soft. Concerning their association with interplanetary proton events at 20 MeV, not all the proton-associated flares are associated with CMEs or located close to the well-connected longitudes. We plan to incorporate analysis of additional data such as metric/kilometric radio spectra to study when and where the shocks form.
Hudson Hugh S.
Nitta Nariaki V.
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