Physics
Scientific paper
Jun 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006spd....37.0121l&link_type=abstract
American Astronomical Society, SPD meeting #37, #1.21; Bulletin of the American Astronomical Society, Vol. 38, p.219
Physics
1
Scientific paper
"Coronal cloud" prominences appear to form as bright knots of mass condensing out of the corona while some of their mass also continuously drains down along curved streamers to the chromosphere. Movies of such "suspended cloud" prominences were recorded in Hα by Dunn as early as the 1950s (1976, Solar Physics 49, 283). They have been also observed in HeI 10830 Å and EIT 304 Å .Four Hα "coronal clouds" were recorded at Helio Research (2004/09/16-17, 2004/11/16-17 and 2005/12/12). Their apparent heights are estimated in the range between 66,000-240,000 km, much higher than the more common prominences and filaments with spines and barbs. Near the surface, the downflows accelerate at a typical speed of 40 km s-1. By comparing the positions of the coronal clouds with magnetograms several days prior to or after the coronal clouds were observed at the limb, we are able to show that the condensations of mass are located above or adjacent to complex active regions. The condensations of the fainter coronal clouds have a V-shaped appearance which suggests to us that these concentrations of mass might be trapped at junctions of separatrix magnetic surfaces.For each of our 4 cases, LASCO movies show a CME 1-2 days prior to the "coronal clouds" and encompassing or overlapping the range of latitudes. In one case, the LASCO movie also shows a downflow after the CME which is radially above the coronal cloud. We suggest that downflows associated with CMEs provide the mass for "coronal clouds" formation even though the downflows are not clearly observed in three of the 4 cases; the downflows could be blocked from our sight by the LASCO occulting disk and/or obscured by the more prevalent outflows of mass.Support from US NSF grant ATM-0209395 and NASA grant NAG5-10852 are acknowledged.
Engvold Odbjørn
Lin Yong
Martin Sara F.
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