On the Disk Halpha and Radio Observations of the 2003 October 28 Flare and Coronal Mass Ejection Event

Monique Pick (1, 2) , Jean-Marie Malherbe (1, 2) , Alain Kerdraon (1, 2) , Dalmiro Maia (3)

1 LESIA - Laboratoire d'études spatiales et d'instrumentation en astrophysique
2 Physique solaire
3 Observatório Astronómico Professor Manuel de Barros

We present the evolution of the Halpha and radio emissions seen by the Meudon Halpha telescope and the Nançay radioheliograph, which are associated with the X17.2 flare and halo CME of 2003 October 28. The remarkable characteristic of this event is its spatial extent that it reached in a few minutes. At 164 MHz, radio images show that the emission covers the whole disk of the Sun and extends as far as 1.8 R_solar from the Sun's center. The radio emissions, the Moreton wave seen in Halpha, and the CME all show a similar temporal and spatial development, and the three phenomena are likely to be related. We show that multifrequency radio imaging observations obtained at high cadence can accurately visualize the initial on-the-disk development of fast halo CMEs and also provide physical parameters such as their speed and angular expansion.

Domaines: Astrophysique [astro-ph]

Monique Pick, Jean-Marie Malherbe, Alain Kerdraon, Dalmiro Maia. On the Disk Halpha and Radio Observations of the 2003 October 28 Flare and Coronal Mass Ejection Event. The Astrophysical journal letters, 2005, 631, pp.L97-L100. ⟨10.1086/497137⟩. ⟨hal-03732605⟩