Preflare Nonthermal Emission Observed in Microwaves and Hard X-Rays

Details Preflare Nonthermal Emission Observed in Microwaves and Hard X-Rays Preflare Nonthermal Emission Observed in Microwaves and Hard X-Rays

Feb 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006pasj...58l...1a&link_type=abstract

Publications of the Astronomical Society of Japan, Vol.58, No.1, pp. L1-L5

Astronomy and Astrophysics

Astronomy

14

Sun: Corona, Sun: Flares, Sun: Particle Acceleration, Sun: Radio Radiation, Sun: X-Rays, Gamma Rays

Scientific paper

We present a detailed examination on nonthermal emissions during the preflare phase of the X4.8 flare that occurred on 2002 July 23. The microwave (17GHz and 34GHz) data obtained with the Nobeyama Radioheliograph at Nobeyama Solar Radio Observatory and the hard X-ray data taken with the Reuven Ramaty High Energy Solar Spectroscopic Imager obviously showed nonthermal features in the preflare phase. We also found a faint ejection associated with the flare in the EUV images taken with the Transition Region and Coronal Explorer. We discuss the temporal and spatial features of the nonthermal emissions in the preflare phase, and their relation with the ejection.

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