Volume 402, Number 2, May I 2003
|Page(s)||L17 - L20|
|Published online||14 April 2003|
Letter to the Editor
Slow-mode standing waves observed by SUMER in hot coronal loops
Max-Planck-Institut für Aeronomie, 37191 Katlenburg-Lindau, Germany
Corresponding author: T. J. Wang, firstname.lastname@example.org
Accepted: 25 March 2003
We report the first detection of postflare loop oscillations seen in both Doppler shift and intensity. The observations were recorded in an line by the SUMER spectrometer on SOHO in the corona about 70 min after an M-class flare on the solar limb. The oscillation has a period of about 17 min in both the Doppler velocity and the intensity, but their decay times are different (i.e., 37 min for the velocity and 21 min for the intensity). The fact that the velocity and the intensity oscillations have exactly a 1/4-period phase difference points to the existence of slow-mode standing waves in the oscillating loop. This interpretation is also supported by two other pieces of evidence: (1) the wave period and (2) the amplitude relationship between the intensity and velocity are as expected for a slow-mode standing wave.
Key words: Sun: corona / flares / oscillations / UV radiation
© ESO, 2003
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.