Physics
Scientific paper
May 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995soph..158..331v&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 158, no. 2, p. 331-351
Physics
41
Magnetohydrodynamic Waves, Shock Waves, Solar Flares, Solar Physics, Sun, Type 2 Bursts, Microwaves, Solar Corona, Solar X-Rays, Time Measurement
Scientific paper
We have selected single frequency recordings of 28 'high-frequency' type II bursts characterized by a starting frequency greater than 237 MHz to estimate as accurately as possible the 'launch-time' of the flare-associated MHD shocks. We established the time associations between metric type II burst onsets and the time characteristics of the microwave and X-ray fluxes of the associated flares. The associated flares were impulsive events with rise times most often about 1 min in the hard X-ray range and 1-2 min in the microwave wavelength range. The majority of the type II bursts from our sample started about 1 min after the maximum of the microwave burst. Launch times of MHD shocks producing type II bursts were obtained using the 10 x Saito coronal model and shock velocities estimates from burst characteristics at different frequencies. Back-extrapolations of type II recordings indicate that MHD shocks are launched in the time interval prior to the maximum of the first peak in the associated microwave burst, most probably at the beginning of the rapid increase of the microwave burst.
Aurass Henry
Ruzdjak Vladimir
Vrsnak Bojan
Zlobec Paolo
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