Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012hell.conf....6a&link_type=abstract
10th Hellenic Astronomical Conference, Proceedings of the conference held at Ioannina, Greece, 5-8 September 2011. Edited by Io
Astronomy and Astrophysics
Astronomy
Scientific paper
We have studied a complex metric radio event,observed with the ARTEMIS radiospectrogarph on February 12, 2010. The event was associated with a surge observed at 195 and 304 A and with a coronal mass ejection observed by STEREO A and B instruments near the East wnd West limbs respectively. On the disk the event was observed at 10 frequencies by the Nancay Radioheliograph (NRH), in H-alpha by the Catania observatory and in soft x-rays by GOES SXI. We combined these data, together with MDI longitudinal magnetic field, to get as complete a picture of the event as possible. Our emphasis is on two type-II bursts that occured near respective maxima in the GOES light curves. The first, associated with the main peak of the event, showed a clear foundamental-harmonic structure, while the emission of the second consisted of three well-separated bands. Using positional infornation for the type-IIs from the NRH we explore their possible association with the surge, the coronal front and the CME. We also studied fine structured and foundamental harmonic structure in the metric dynamic spectrum.
Alissandrakis Constantine
Artemis Group
Hillaris Al.
Nindos Alexander
Patsourakos Spiros
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