Hallo Zusammen,
hätte ich mal früher die Mailbox gecheckt...
Gleich noch die passende CME-Mail dazu.
Aber die Speeds sind auch nicht so der Bringer...
Viele Grüße,
Lutz
UCMEO 93001 60501 1900/
60430 61034 82118 0001/ 360// 112// 10430
60430 60917 80939 20809 10876 1112/
99999
PLAIN
LASCO/EIT observed a couple of frontsided events on 2006/04/30 since early
in the day. For completeness the description of both events follows, though
is the second event the one more likely geoeffective. In particular:
[1] After a LASCO data gap between 01:31 - 03:54 UT (C2 time) LASCO C2
images show a bright and ragged loop front already under development
(LE almost at the end of the C2 FOV). Very faint extensions seem to cover
the C2 occulting disk by 06:06 UT, though it is difficult to say if those
extension are really associated to the bright loop front event. GOES
recorded a C5.3 X-ray flare on NOAA AR 10878 (~N16E74) between
01:33 - 02:07 UT with peak emission at 01:57 UT. There is also an EIT
data gap (between 01:36 - 03:48 UT). Therefore, no signatures of the flare
could be recorded. However, EIT 195 images do show evidence of a CME under
development on and behind the limb on ENE after the data gap.
[2] An extremely faint and diffuse brightening starts to be discernible
in C2 above ENE at 10:34 UT, apparently covering the C2 occulting disk
by 11:54 UT (elliptical shape, i.e., elongated toward E and W). The event
is barely discernible in C3. A very unreliable determination of its
mean plane-of-sky speed based only in C2 data is as follows (signal too
faint and diffuse even in C2 to precise the location of the LE):
PA 280: ~360 km/sec
PA 043: ~430 km/sec
GOES recorded a C1.8 X-ray flare on NOAA AR 10876 (S09E08) between
09:17 - 09:39 UT with peak emission at 09:26 UT. EIT 195 images show a
brightening between 09:24 and 09:48 UT concentrated in the W part of
the AR. Some dimming around the filament channel (FC) N and E of AR.
In summary, the event [2] has therefore been determined as an extremely
faint Full Halo Event (only visible in C2), frontsided, associated to a
C-class X-ray event on NOAA AR 10876.
LASCO and EIT movies and images including both events will shortly be
made available at:
ftp://ares.nrl.navy.mil/pub/lasco/halo/20060430
Best wishes,
Guillermo Stenborg
+--------------------------------------------------+
Dr. Guillermo A. Stenborg
SOHO-LASCO Operations Scientist,
CUA, MC 612.5, Bldg 26, Rm 001, F: +1-301-286-0264
NASA Goddard Space Flight Center,
Greenbelt, MD 20771. P: +1-301-286-2941
e-mail:
stenborg@kreutz.nascom.nasa.gov
+--------------------------------------------------+
BT
