Observation of eruptive events with the Siberian Radioheliograph

Abstract

We describe methods for monitoring eruption activity with the first phase of the multiwave Siberian Radioheliograph (SRH-48). We give examples of the recorded eruptive events: 1) rise of a prominence above the limb observed in the radio map sequence of April 24, 2017; 2) a jet recorded on August 2, 2017, whose cold matter screened a compact microwave source for several tens of minutes. The shading due to the jet appearance was observed on SRH-48 correlation curves as the so-called "negative" burst. Using the "negative" burst on the correlation curves of February 9, 2017 as an example, we show that the intervals with depression of the microwave emission of local sources are not always caused by shading of their emission. In this event, the radio brightness decreased within ten hour period of the increased quasi-stationary emission during the development of AR 12635 magnetic structure. Similar behavior was observed in EUV, SXR, and radio emission at 17 GHz.

Incoherent Solar Radio Emission

“…Reproduced with permission. Uralov et al, 2002;Grechnev et al, 2006b;Alissandrakis et al, 2013;Fedotova et al, 2018;Huang et al, 2019). In most cases the eruptive prominence detected in radio eventually evolves into the core of the white-light CME.…”

Coronal Jets as a Cause of Microwave Negative Bursts

“…Such events are generally associated with the filament eruption from an active region. The cause of the negative bursts in these cases is absorption of the emission from the quiet Sun's regions and compact radio sources by low-temperature plasma of an erupting prominence [Covington, Dodson, 1953;Sawyer, 1977;Kuzmenko et al, 2009]. The area of the absorbing material is normally <10 % of the area of the solar disk, and its temperature is ~10 4 K.…”