34th Solar Physics Division Meeting, June 2003
Session 10 Transequatorial and other Coronal Structures
Oral, Tuesday, June 17, 2003, 9:00am-12:00noon, Auditorium

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[10.04] Observations of CMEs associated with trans-equatorial loop systems

J.I. Khan (U. Turku, Finland), H.S. Hudson (UCB)

Soft X-ray observations frequently show the existence of trans-equatorial loop systems, often rooted near an active region. The visibility in soft X-rays implies relatively high temperature, a fact that has no ready explanation. The Yohkoh SXT observations from April-May 1998 showed the persistent formation and re-formation of trans-equatorial loops associated with NOAA AR 8210. At least four such events happened: May 2, 6, 8, and 9. In these events the erupting loop systems become parts of the associated CMEs. These events were also associated with major flares and with global waves visible in soft X-rays and type II bursts. We suggest that this morphology, even in cases in which the trans-equatorial structure was not hot enough to be visible in soft X-rays, could explain the occurrence of the larger angular scales of some CMEs as opposed to their associated flares.


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