Yohkoh Observations of the Coronal Mass Ejection of 4th April 1995

fl238.culhane04
Posted:  07-Jul-96
Updated:
Events specified: CME of 4-Apr-95

Len Culhane, Carl Foley, Hugh S Hudson, Louise K Harra-Murnion

ABSTRACT.

The corona above the B5.6 flare observed by Yohkoh on the 4th April 1995, shows dramatic expansion, and subsequent ejection of material with a whip like action. Excellent coverage of this event is obtained with Yohkoh, providing excellent data for analysis of the velocity fields and morphology. The event appears typical of events observed with Yohkoh ( 28-Aug-92 and 13-Nov-94 ), with the rising motion and flare brightening occurring simultaneously, except the associated flare is not of the LDE variety. The expansion of the corona appears to progress during the flare rise phase, after which the region appears to be predominantly radial, consistent with the CME launch occurring at flare maximum.

The Wind spacecraft, encountered a period after the Yohkoh event, consistent with the CME flight time, with strong ram pressure changes, due to sharp changes in density, while the velocity increased from 400 to near 680km/s.

We Will investigate

1. The velocity fields for this event.

       
    The causal relationship of the B5.6 flare and the CME.     
       
    The Wind plasma signature relationship to the SXT observations of the eruption.      
       
    Relate these observations to current CME models.     

Hugh Hudson will include the preliminary results for this event during his presentation at the Montana CME meeting in August.