Relationship between wave processes in sunspots and quasi-periodic pulsations in active region flares

2010/05/20 by R. Sych, V. M. Nakariakov, M. Karlicky +1 · 1 citation
Physics and Astronomy · #astro-ph.SR

paper · pdf · doi:10.1051/0004-6361/200912132

published as Astronomy and Astrophysics, Volume 505, Issue 2, pp.791-799, 2009 · 9 pages, 11 figures

arxiv created 2010/05/20 · arxiv updated 2015/05/19

Abstract

A phenomenological relationship between oscillations in a sunspot and quasi-periodic pulsations in flaring energy releases at an active region above the sunspot, is established. The analysis of the microwave emission recorded by the Nobeyama Radioheliograph at 17 GHz shows a gradual increase in the power of the 3-min oscillation train in the sunspot associated with AR 10756 before flares in this active region. The flaring light curves are found to be bursty with a period of 3 min. Our analysis of the spatial distribution of the 3-min oscillation power implies that the oscillations follow from sunspots along coronal loops towards the flaring site. It is proposed that quasi-periodic pulsations in the flaring energy releases can be triggered by 3-min slow magnetoacoustic waves leaking from sunspots.

Cited by

• Investigating Pre-flare Signatures in Spectroscopic Observations of an X9-class Solar Flare

Related

• The slow magnetoacoustic mode in the flaring loop
• Remote Oscillatory responses to a solar flare
• Localizing Quasiperiodic Pulsations in Hard X-Ray, Microwave, and Lyα Emissions of an X6.4 Flare
• Triangulation Tracking of a Radially Propagating MHD Wave in the AIA 1600 Acoustic Power Maps in Active Region 12193
• Broadband Quasi‐periodic Radio and X‐Ray Pulsations in a Solar Flare