Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...182..337h&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 182, no. 2, Aug. 1987, p. 337-347.
Astronomy and Astrophysics
Astrophysics
29
Coronal Loops, Solar Maximum Mission, Solar Oscillations, Solar X-Rays, Magnetohydrodynamic Waves, Solar Magnetic Field
Scientific paper
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.
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