Metric observations of transient, quasi-periodic radio emission from the solar corona in association with a "halo" CME and an "EIT wave" event

Abstract

We present metric radio observations of quasi-periodic emission from the solar corona in close association with a "halo" CME and an "HIT wave" phenomenon. The radio event lasted for about 60 s. Its mean periodicity was ≈ 8.8 s. The estimated Alfvén speed in the corona was 1034 km s-1. The derived height of the source region of the observed quasi-periodic emission, and the magnetic field at the corresponding location (for emission in the fundamental mode) were ∼0.23 R⊙ and 6.3 G, respectively. The magnetic field for harmonic emission was found to be ∼3.1 G.