Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006ihy..worke..45s&link_type=abstract
2nd UN/NASA Workshop on International Heliophysical Year and Basic Space Science. Proceedings of the conference held 27 Novembe
Astronomy and Astrophysics
Astrophysics
Scientific paper
The observations taken in He 304 Å reveal that these images are extremely useful to trace prominences because of the relatively sharper spine which is better visible in 304 Å than in H-alpha. In this paper, we have studied several eruptive quiescent prominence images recorded by EIT in He 304 Å during January 2000 - July 2003 in an attempt to identify the precursors of CMEs that are associated with eruptive prominences. Our analyses show that erupting prominences evolve through a pre-eruptive phase and an eruptive phase which are characterized by lower velocities of several km/s and eruptive velocities of several tens to hundreds of km/s, respectively. The analyses also show that during the pre-eruptive phase, a prominence rises at a constant acceleration ranging between 4-12 cm/s2 and not at constant velocity as reported by previous workers. The values of acceleration are found to be lower in comparison to that measured during the eruptive phase which ranges between 10-80 m/s2. A comparison of height-time profiles of various features of prominences and associated CMEs provides information on their role in the eruption process. We suggest that the characteristic slow rise of eruptive prominences might be considered as reliable amongst all CME precursors. The kinematics of slowly rising filaments/prominences also helps in understanding the nature of propagation of the associated CMEs. We further investigated if the filaments which rise slowly are the ones which are associated with a slow expansion of the corona and/or slow outward motion before the phase of rapid mass expulsion. Such distinctions are extremely useful in identifying the eruption of CMEs directed toward the Earth, when they are associated with erupting filaments.
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