Decameter Type III-Like Bursts

TL;DR

This paper reports the first observations of Type III-like radio bursts at 10-30 MHz, analyzing over 1000 events, revealing their high drift rates, short durations, and association with active regions near the solar central meridian.

Contribution

It presents the first detection and analysis of Type III-like bursts at decameter frequencies, expanding understanding of solar radio emissions.

Findings

Type III-like bursts have higher frequency drift rates than traditional Type III bursts.

These bursts typically last 1-2 seconds.

They are mainly observed when the active region is near the solar central meridian.

Abstract

We report the first observations of Type III-like bursts at frequencies 10 30 MHz. More than 1000 such bursts during 2002 2004 have been analyzed. The frequency drift of these bursts is several times that of decameter Type III bursts. A typical duration of the Type III-like bursts is 1 2 s. These bursts are mainly observed when the source active region is located within a few days from the central meridian. The drift rate of the Type III-like bursts can take a large value by considering the velocity of Type III electrons and the group velocity of generated electromagnetic waves.