Radio and X ray Observations of a Limb Flare during the Max Millennium Campaign

Details Radio and X ray Observations of a Limb Flare during the Max Millennium Campaign Radio and X ray Observations of a Limb Flare during the Max Millennium Campaign

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sp51a03l&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SP51A-03

Astronomy and Astrophysics

Astrophysics

7500 Solar Physics, Astrophysics, And Astronomy, 7509 Corona, 7514 Energetic Particles (2114), 7519 Flares, 7534 Radio Emissions

Scientific paper

A powerful (GOES Class M9.8), limb flare was observed on 1999 August 20 above AR 8673 during the second Max Millennium campaign. Due to its location on the limb as well as its strength, the flare observation provides an ideal case of studying vertical structure of electron acceleration and its transport. The hard X ray images from Yohkoh/HXT along with EUV images from SoHO/EIT show an impulsive, compact double brightening in the lower atmosphere and a hypothesis of footpoint emission from a compact loop seems likely. In contrast, microwave visibilities obtained using the Owens Valley Solar Array (OVSA) suggest a region of high energy electrons high in the corona (2x 105 km), requiring large loops that can act as a good trap of electrons. The duration of radio emission is also much extended compared with the hard X ray emission. We present this set of observations as a good example of the trap-plus-precipitation hypothesis, and derive numbers of electrons emitting the microwaves and hard X rays, respectively, as a measure for the trap vs. precipitation. The derived time evolution of electron numbers in energy space is not compatible with a simple hypothesis of energy-independent acceleration solely under Coulomb collisions, but instead requires an acceleration or transport process that is highly energy-dependent.

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