Eit and LASCO Observations of the Initiation of a Coronal Mass Ejection |
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| Authors: | K P Dere G E Brueckner R A Howard M J Koomen C M Korendyke R W Kreplin D J Michels J D Moses N E Moulton D G Socker O C St Cyr J P Delaboudinière G E Artzner J Brunaud A H Gabriel J F Hochedez F Millier X Y Song J P Chauvineau J P Marioge J M Defise C Jamar P Rochus R C Catura J R Lemen J B Gurman W Neupert F Clette P Cugnon E L Van Dessel P L Lamy A Llebaria R Schwenn G M Simnett |
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| Institution: | (1) Naval Research Laboratory Washington D.C., E.O. Hulburt Center for Space Research, 20375-5320, U.S.A;(2) Sachs Freeman Assoc, USA;(3) Universities Space Research Assoc, USA;(4) Allied Signal Corp, USA;(5) Computational Physics Inc, USA;(6) Institut d'Astrophysique Spatial, Université, Paris XI, 91405 Orsay, France;(7) Institut d'Optique Théorique et Appliquée, 91403 Orsay, France;(8) Centre Spatial de Liège, Liège, Belgium;(9) Lockheed Martin Palo Alto Research Laboratory, Palo Alto, CA, 94304, U.S.A;(10) Nasa Goddard Space Flight Center, Greenbelt, MD, 20771, U.S.A;(11) Observatoire Royal de Belgique, Brussels, Belgium;(12) Laboratoire d'Astronomie Spatiale, Marseille, France;(13) Max-Planck-Institut für Aeronomie, Lindau, Germany;(14) Space Research Group, School of Physics and Space Research, University of Birmingham, Birmingham, U.K |
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| Abstract: | We present the first observations of the initiation of a coronal mass ejection (CME) seen on the disk of the Sun. Observations
with the EIT experiment on SOHO show that the CME began in a small volume and was initially associated with slow motions of
prominence material and a small brightening at one end of the prominence. Shortly afterward, the prominence was accelerated
to about 100 km s-1 and was preceded by a bright loop-like structure, which surrounded an emission void, that traveled out into the corona at
a velocity of 200–400 km s-1. These three components, the prominence, the dark void, and the bright loops are typical of CMEs when seen at distance in
the corona and here are shown to be present at the earliest stages of the CME. The event was later observed to traverse the
LASCO coronagraphs fields of view from 1.1 to 30 R⊙. Of particular interest is the fact that this large-scale event, spanning
as much as 70 deg in latitude, originated in a volume with dimensions of roughly 35" (2.5 x 104 km). Further, a disturbance that propagated across the disk and a chain of activity near the limb may also be associated
with this event as well as a considerable degree of activity near the west limb. |
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