SOHO/LASCO Halo CME 20100329

Halo Alert: halo-message.20100329

Subject SOHO/LASCO Partial HALO CME 100329 - Backsided

UCMEO 93001 00329 1800/
00329 60854 91618 2002/ 132// 213// 20300
00329 ///// ///// ///// ///// /////
99999

PLAIN

SOHO/LASCO observed a very faint partial HALO CME on March 29, 2010.
This event begins in the C2 field at 08:54 UT as a very wide rough edge across
the NW and the East hemisphere, PA 200-132 degrees for a total 292 degrees
wide. At 09:08 UT an additional leading edge of material surfaces centered at
PA 285 degrees which expands. The event is seen in C3 beginning at 10:18 UT
and measured through till 16:18 at 13.2 Rs.

The event was measured at 2 PAs, at 8 degrees (246 km/sec) over the beginning
of the event and also at 288 degrees (326.0 km/sec) which was centered over the
brighter loop. The event dissipated quickly and slowed through C3 to an averaged
speed of 296.7 km/sec out to 13 Rs.

EIT showed no activity which could correspond to the start time of the event in C2.
At 09:36 UT there is prominence material on limb which is active near PA 310
degrees and could possibly be connected to the core material seen with the NW
looping. This event is determined a BACKSIDED event.

Best regards,

Kevin Schenk
SOHO Mission
EIT and LASCO Operations
NASA-Goddard Space Flight Center, USA

BT

Time/Height Velocities and Plots

C2/C3

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Halo Alert: halo-message.20100329

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SOHO/LASCO C2 Diff	SOHO/LASCO C2 Diff