Quasi-Periodic Oscillations in Lasco Coronal Mass Ejection Speeds

Details Quasi-Periodic Oscillations in Lasco Coronal Mass Ejection Speeds Quasi-Periodic Oscillations in Lasco Coronal Mass Ejection Speeds

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010apj...708..450s&link_type=abstract

The Astrophysical Journal, Volume 708, Issue 1, pp. 450-455 (2010).

Astronomy and Astrophysics

Astronomy

1

Sun: Corona, Sun: Coronal Mass Ejections: Cmes, Solar Wind

Scientific paper

Quasi-periodic oscillations in the speed profile of coronal mass ejections (CMEs) in the radial distance range 2-30 solar radii are studied. We considered the height-time data of the 307 CMEs recorded by the Large Angle and Spectrometric Coronagraph (LASCO) during 2005 January-March. In order to study the speed-distance profile of the CMEs, we have used only 116 events for which there are at least 10 height-time measurements made in the LASCO field of view. The instantaneous CME speed is estimated using a pair of height-time data points, providing the speed-distance profile. We found quasi-periodic patterns in at least 15 speed-distance profiles, where the speed amplitudes are larger than the speed errors. For these events we have determined the speed amplitude and period of oscillations. The periods of quasi-periodic oscillations are found in the range 48-240 minutes, tending to increase with height. The oscillations have similar properties as those reported by Krall et al., who interpreted them in terms of the flux-rope model. The nature of forces responsible for the motion of CMEs and their oscillations are discussed.

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