Loss-cone instability modulation due to a magnetohydrodynamic sausage mode oscillation in the solar corona

Show full item record



Permalink

http://hdl.handle.net/10138/302565

Citation

Carley , E P , Hayes , L A , Murray , S A , Morosan , D E , Shelley , W , Vilmer , N & Gallagher , P T 2019 , ' Loss-cone instability modulation due to a magnetohydrodynamic sausage mode oscillation in the solar corona ' , Nature Communications , vol. 10 , 2276 . https://doi.org/10.1038/s41467-019-10204-1

Title: Loss-cone instability modulation due to a magnetohydrodynamic sausage mode oscillation in the solar corona
Author: Carley, Eoin P.; Hayes, Laura A.; Murray, Sophie A.; Morosan, Diana E.; Shelley, Warren; Vilmer, Nicole; Gallagher, Peter T.
Contributor: University of Helsinki, Space Physics Research Group
Date: 2019-05-23
Language: eng
Number of pages: 12
Belongs to series: Nature Communications
ISSN: 2041-1723
URI: http://hdl.handle.net/10138/302565
Abstract: Solar flares often involve the acceleration of particles to relativistic energies and the generation of high-intensity bursts of radio emission. In some cases, the radio bursts can show periodic or quasiperiodic intensity pulsations. However, precisely how these pulsations are generated is still subject to debate. Prominent theories employ mechanisms such as periodic magnetic reconnection, magnetohydrodynamic (MHD) oscillations, or some combination of both. Here we report on high-cadence (0.25 s) radio imaging of a 228 MHz radio source pulsating with a period of 2.3 s during a solar flare on 2014-April-18. The pulsating source is due to an MHD sausage mode oscillation periodically triggering electron acceleration in the corona. The periodic electron acceleration results in the modulation of a loss-cone instability, ultimately resulting in pulsating plasma emission. The results show that a complex combination of MHD oscillations and plasma instability modulation can lead to pulsating radio emission in astrophysical environments.
Subject: CYCLOTRON MASER INSTABILITY
RADIO PULSATIONS
TRANSITION-REGION
PLASMA RADIATION
EMISSION
ABSORPTION
INJECTION
SIGNATURE
ELECTRONS
BURSTS
114 Physical sciences
115 Astronomy, Space science
Rights:


Files in this item

Total number of downloads: Loading...

Files Size Format View
s41467_019_10204_1.pdf 8.298Mb PDF View/Open

This item appears in the following Collection(s)

Show full item record