Physics
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsp44a..01a&link_type=abstract
American Geophysical Union, Spring Meeting 2008, abstract #SP44A-01
Physics
7509 Corona, 7513 Coronal Mass Ejections (2101), 7519 Flares, 7549 Ultraviolet Emissions
Scientific paper
STEREO/EUVI observed a respectable number of small flares and CMEs during the first year of its mission. A comprehensive survey between Dec 2006 and Jan 2008 yields: 10 GOES >M1-class flares, 20 GOES >C5-class flares, 80 >C1-class flares, 180 flares with >25 keV hard X-ray emission observed by RHESSI, at least 35 flare events with associated CME reports by LASCO or STEREO COR-1, and 25 flare events are occulted by either STEREO A or B. Some flares associated with CMEs clearly show an EUV dimming in the active region below the launched CME, for which we determine for the first time the 3D geometry with the two STEREO A and B spacecraft, allowing us to model the volume, density, and ejected mass from the corona. Some flares show impulsive signatures in EUV, simultaneously occurring with hard X-rays pulses, indicative of the primary heating of the chromospheric plasma. In larger flares, the bulk of the EUV emission is always substantially delayed to the soft X-ray emission, as a result of the plasma cooling from soft X-ray to EUV temperatures, from which we can estimate the total thermal flare energy using hydrodynamic models.
Aschwanden Markus J.
Lemen James R.
Nitta Nariaki V.
Wuelser J.
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