Mathematics – Logic
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011spd....42.0906l&link_type=abstract
American Astronomical Society, SPD meeting #42, #9.06; Bulletin of the American Astronomical Society, Vol. 43, 2011
Mathematics
Logic
Scientific paper
We report new SDO/AIA observations of a global EUV disturbance that propagates at 600 km/s and sweeps through a coronal cavity, instigating its bodily transverse oscillations. The high temporal resolution and large FOV of AIA allow us to clearly see, for the first time, the timing coincidence between the onsets of the oscillations and the arrival of the disturbance at increasing distances covering 300 Mm in the neighborhood of the cavity. There is a time delay of the oscillations from the near side to the far side of the cavity, which is consistent with the travel time of the global perturbation. In addition, we find a fine structure consisting of evenly spaced pulses of periods 100-120 s within the global disturbance. In contrast, the CME loop expansion falls behind the global disturbance at a smaller velocity of 200 km/s. These observations suggests that this global disturbance is a real fast mode MHD wave that continues propagating into the cavity, rather than an apparent wave caused by CME expulsion that is not expected to penetrate through a topological separatrix, including the flux rope cavity boundary here. The cavity and its hosted prominence have oscillation amplitudes of 20 km/s and periods of 20-30 minutes. Such unusually long periods, compared with a few minutes commonly observed in coronal loops, likely reflect kink mode oscillations of the long cavity flux rope of a large length (a fraction of the solar radius).
Aschwanden Markus J.
Liu Wei
Nitta Nariaki V.
Ofman Leon
Tarbell Ted D.
No associations
LandOfFree
SDO/AIA Observations of a Global EUV Disturbance Traveling into a Coronal Cavity and Its Subsequent Oscillations: New Evidence of Fast Mode MHD Waves does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with SDO/AIA Observations of a Global EUV Disturbance Traveling into a Coronal Cavity and Its Subsequent Oscillations: New Evidence of Fast Mode MHD Waves, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and SDO/AIA Observations of a Global EUV Disturbance Traveling into a Coronal Cavity and Its Subsequent Oscillations: New Evidence of Fast Mode MHD Waves will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-943407