Decameter Type IV Burst with High Polarization on 13 July 2022-Reference-Cited by-同舟云学术

Decameter Type IV Burst with High Polarization on 13 July 2022

Published:2023-03-30 Issue: Volume: Page:
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Author:

Melnik V. N.¹,Brazhenko A. I.²,Frantsuzenko A. V.²,Dorovskyy V. V.¹,Shevchuk M. V.¹

Affiliation:

1. Institute of Radio Astronomy

2. Institute of Geophysics, Gravimetrical Observatory

Abstract

Abstract We discuss properties of Type IV burst observed by radio telescopes URAN-2 (Ukrainian Radio Interferometer of NASU-2) and NDA (Nançay Decameter Array) on 13 July 2022. This burst was registered at frequencies 26–80 MHz and lasted from 07:00 to 12:00 UT. It had the fine structure in the form of sub-bursts similar to decameter Type III-like bursts, with negative frequency drift rates from − 5MHz/s to -21MHZ/s and sometimes with positive drifts. Their durations were from 1 s to 2.6 s in most cases and maximum fluxes were up to 700 s.f.u. At the same time maximum polarization of Type IV burst was 100%. It is very unusual for decameter Type IV bursts because as a rule this value is about 40%. This Type IV burst was not associated with any CME. We discuss properties of this Type IV burst in the plasma model of radio emission.

Publisher

Research Square Platform LLC

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