Other
Scientific paper
Aug 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003basbr..23...24k&link_type=abstract
Boletim da Sociedade Astronômica Brasileira (ISSN 0101-3440), vol.23, no.1, p. 24-24
Other
Scientific paper
The rapid solar spikes (100-500 ms) discovered at submillimeter waves bring new possibilities to investigate energetic processes near the solar surface which might have an important role in the launch and propelling ionized masses away from the Sun. We present a study on the association between the launch time of coronal mass ejections (CMEs) observed by LASCO experiment on SOHO satellite and onset of the new kind of rapid solar spikes (100-500 ms) observed at submillimetric waves (212 and 405 GHz) by the new Solar Subm-wave Telescope (SST). We investigated six submm-wave events, all found associated to CMEs. Five of them were associated to flares with large GOES class soft X-rays, presenting distinct time histories and associations at other energy ranges, and one was possibly connected to subflares and unrelated to a weak X-ray enhancement. EIT SOHO ultraviolet images show some kind of small or large scale magnetic activity or brightening for all events. The extrapolation of apparent CMEs positions to solar surface was found to be nearly coincident in time with the onset of submm-wave pulses for all six events. These results suggest that pulse bursts might be representative of an important early signature of CMEs, specially for events beginning near the center of the solar disk, sometimes identified as "halo" CMEs. They bring at the same time several challenging questions relative to the physical nature of the pulses and its association to the coronal mass launch and propelling out from the Sun. Although these evidences may favor multiple rapid energy releases at the origin near the solar surface, they require further research progresses for better understanding both diagnostics and model descriptions.
Guillermo Gimenez de Castro Carlos
Kaufmann Patrik
Levato Hugh
Makhmutov Vladimir S.
Rainer Schwenn R.
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