Non-thermal Velocities in Solar Flares [Invited]

Details Non-thermal Velocities in Solar Flares [Invited] Non-thermal Velocities in Solar Flares [Invited]

Jan 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002mwoc.conf..261h&link_type=abstract

Multi-Wavelength Observations of Coronal Structure and Dynamics -- Yohkoh 10th Anniversary Meeting. Proceedings of the conferenc

Physics

Scientific paper

The high resolution spectroscopic information from the Bragg Crystal Spectrometer onboard Yohkoh has provided us with new and exciting information about flares and active regions. In particular, there has been much work on understanding the excess line broadening above the thermal width (known as non-thermal line broadening). We have been able to look for the first time spectroscopically at the preflare stages. The timings of the non-thermal velocity relative to the hard X-ray emission has been investigated. Non-thermal velocities have been observed to increase ten minutes before the main flares begins. Progress has been made to locate the region of dominant non-thermal velocity. This is difficult due to the lack of spatial resolution. A discussion will be made on what can be expected from the EUV Imaging Spectrometer onboard Solar B, which combines both high spatial and spectral resolution simultaneously.

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