Open AccessFine structure events in microwave emission during solar minimum
Author(s) -
Тань Чэнмин,
Chengming Tan,
Тань Биолинь,
Baolin Tan,
Йан Йихуа,
Yihua Yan,
Ван Вэй,
Wei Wang,
Чэнь Линьцзе,
Linjie Chen,
Лю Фэй,
Liu Fei,
Доу Ицзян,
Yujiang Dou
Publication year - 2019
Publication title -
solar-terrestrial physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.11
H-Index - 2
ISSN - 2500-0535
DOI - 10.12737/stp-52201901
Subject(s) - physics , sunspot , solar flare , solar radio , solar minimum , astrophysics , astronomy , solar cycle , magnetic field , solar wind , quantum mechanics
The solar minimum is a period with a relatively smaller number of sunspots and solar eruptions, and has been less studied before. Since the radio signal rapidly responds to the change of solar plasma and magnetic field, we perform a comprehensive analysis of high resolution spectrum data from SBRS and MUSER: 1) a search for solar radio bursts of different kinds in recent solar minima (2007–2009 and 2016–2018); 2) an analysis of several typical radio burst events, negative and positive drifting bursts, for example the November 22, 2015 and August 29, 2016 events; superfine spectral structure events with mini-flares and even without sunspots, for example the March 28, 2008 and July 04, 2017 events. These results show that there were many radio bursts with a fine structure during solar minima. These events occurred not only in powerful flares, but also in faint flares (class C and B by GOES) or even without flares, but in regions related to weak brightenings or ejecta. We assume that the weak solar radio bursts observed by telescopes with high sensitivity and low interference will help us to understand the basic physical characteristics of small-scale solar eruptions.