Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003basbr..23...23g&link_type=abstract
Boletim da Sociedade Astronômica Brasileira (ISSN 0101-3440), vol.23, no.1, p. 23-23
Astronomy and Astrophysics
Astronomy
Scientific paper
We present preliminary results of a multiwavelength analysis of the flare classified as X1.5 which occurred on Aug 30 2002 at about 1328 UT in NOAA region 0095. The event was observed by the Ramaty High Energy Solar Spectrometer Imager (RHESSI) up to 200-300 keV and by the new Solar Submillimeter Telescope (SST) at 212 GHz. Radio image observations at long decimetric-metric waves obtained with the Nançay Radioheliograph are also being included. Our analysis utilizes radio flux from different telescopes to cover an extended range from 160 MHz up to 212 GHz. HxR images show two sources above 30-40 keV, 5 and 3 arc sec in diameter separated by about 7 arc sec, and a third source at low energies. Both the total photon spectra and individual source spectra, were fitted by a double power-law. We compare HxR with Ha images obtained with the HASTA telescope. During peak time the microwave spectrum is flat between 10 to 35 GHz. We discuss a flare model with a homogeneous source which includes both gyrosynchrotron and free-free emission/absorption to explain the observed flatness.
Correia Emilia
Costa Joaquim E. Rezende
Guillermo Gimenez de Castro Carlos
Kaufman Pierre
Krucker Sa"m
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