Observations of radio spectra at 1-2.5 GHz associated with CME start time

Details Observations of radio spectra at 1-2.5 GHz associated with CME start time Observations of radio spectra at 1-2.5 GHz associated with CME start time

Mar 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009iaus..257..317c&link_type=abstract

Universal Heliophysical Processes, Proceedings of the International Astronomical Union, IAU Symposium, Volume 257, p. 317-321

Statistics

Cme, Radio, Bursts

Scientific paper

We know Coronal Mass Ejections (CME) and flares are the most energetic phenomena happening on the Sun. Until now the information about origin and trigger mechanism of CMEs remains scarce. Also, there is unconclusive information about the association between them and flares although progress has been made in recent years. Multi-spectral observations suggested that the flare energy release occurs in regions from where the decimetric radio emission originates. In this case, investigations of the solar emission in this wavelength range can give us valuable information about these questions. During last solar maximum the Brazilian Solar Spectroscope (BSS) observed the solar radio spectrum (1-2.5 GHz) with high time (100-20 ms) and frequency (50-100 channels) resolutions on a daily (11-19 UT) basis. A survey during the period 1999-2002, shows that a significant fraction (20% -57 events) of CMEs recorded by LASCO has an association with the spectra of radio bursts recorded by BSS. Analysis of the radio spectrum associated to CME shows there is a dominance of continuum and/or pulsation and that the association becomes stronger when we consider the CME acceleration since its origin on the Sun. A statistics of this association between CME dynamics and the characteristics of decimetric radio bursts recorded by BSS is presented. Emphasis is given to observations of the association with CME start time.

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