An estimation of the plasma parameters in the solar corona using quasi-periodic metric type III radio burst emission

¹ Centre for Research and Education in Science & Technology, Indian Institute of Astrophysics, Hosakote 562 114, India e-mail: ramesh@iiap.res.in
² Indian Institute of Astrophysics, Bangalore 560 034, India
³ “MEENAKSHI”, No. 3, 2nd Cross, 1st Block, Koramangala, Bangalore 560 034, India
⁴ Raman Research Institute, Bangalore 560 080, India

Received: 21 April 2004
Accepted: 19 October 2004

Abstract

We report radio observations of quasi-periodic type III burst emission from the solar corona in close association with the 2B/X2.8 flare of December 11, 2001 at two frequencies (151.5 and 109 MHz). The measured mean period was ≈11.6 s. We attempted to infer the plasma parameters of the region where the electron beams responsible for the observed type III emission were accelerated/injected using our data, and the values are the following: the Alfvén speed  km s^-1; the electron density  cm^-3; the magnetic field strength  G.