Fundamental-mode Oscillations of Two Coronal Loops within a Solar Magnetic Arcade
Abstract
We analyze intensity variations, as measured by the Atmospheric Imaging Assembly in the 171 Å passband, in two coronal loops embedded within a single coronal magnetic arcade. We detect oscillations in the fundamental mode with periods of roughly 2 minutes and decay times of 5 minutes. The oscillations were initiated by interaction of the arcade with a large wavefront issuing from a flare site. Further, the power spectra of the oscillations evince signatures consistent with oblique propagation to the field lines and for the existence of a two-dimensional waveguide instead of a one-dimensional one.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- May 2015
- DOI:
- 10.1088/2041-8205/804/1/L19
- arXiv:
- arXiv:1504.07822
- Bibcode:
- 2015ApJ...804L..19J
- Keywords:
-
- Sun: activity;
- Sun: atmosphere;
- Sun: corona;
- Sun: coronal mass ejections: CMEs;
- Sun: flares;
- Sun: oscillations;
- Astrophysics - Solar and Stellar Astrophysics
- E-Print:
- doi:10.1088/2041-8205/804/1/L19