Solar soft X-ray pulsations
Abstract
Using data from the Hard X-ray Imaging Spectrometer on the Solar Maximum Mission, soft X-ray (3.5 - 5.5 keV) pulsations are identified, which originate from a compact active region which lies at one footpoint of a large coronal loop. It is believed that this is the first report of soft X-ray pulsations from the non-flaring sun. The pulsations were of period 24 min and were detected for six hours. The periodicity is thought to be produced by a standing wave or a travelling wave "packet" which exists within the loop. The candidates for the wave are fast or Alfvén MHD modes of Alfvénic surface waves.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- August 1987
- Bibcode:
- 1987A&A...182..337H
- Keywords:
-
- Coronal Loops;
- Solar Maximum Mission;
- Solar Oscillations;
- Solar X-Rays;
- Magnetohydrodynamic Waves;
- Solar Magnetic Field;
- Solar Physics