New Results from the Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI) Mission

Details New Results from the Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI) Mission New Results from the Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI) Mission

Jan 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004iaus..219...41l&link_type=abstract

Stars as suns : activity, evolution and planets, Proceedings of the 219th symposium of the International Astronomical Union held

Astronomy and Astrophysics

Astronomy

Scientific paper

Solar flares are the most energetic explosions in the solar system releasing up to 1032-1033 ergs in ~10- 1000s. The flare-accelerated ~10-100 keV electrons (and sometimes >~1 MeV ions) appear to contain >~10-50% of this energy indicating that the particle acceleration and energy release processes are intimately linked. The RHESSI (Ramaty High Energy Solar Spectroscopic Imager) mission (launched 5 Feb 2002) utilizes rotating modulation collimators and cooled germanium detectors to provide the first high resolution imaging (~2 arcsec) and spectroscopy (~keV FWHM) of hard X-ray/gamma-ray continuum and gamma-ray lines emitted by energetic electrons and ions respectively at the Sun. I will review RHESSI solar flare observations including the first high resolution spectroscopy and imaging of flare gamma-ray lines and the first imaging spectroscopy in hard X-rays and discuss the implications for electron and ion acceleration. RHESSI also observes hard X-ray counterparts to solar radio bursts and continous 3-15 keV solar X-ray emission with frequent (every few minutes) microflaring. These suggest that flares- microflares-nanoflares together may provide significant heating of the active corona.

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