Schwache Schockfront am ACE...

[Ulrich Rieth]

...fast 24 Stunden "zu spät".

WEAK SHOCK DETECTED IN SOLAR WIND AT 20 06 2003 0755UT

Mean Solar Wind Parameters Pre/Post Shock:

Pre Post Pre/Post

Param. Unit Shock Shock Change

Density part/cc 1.6 5.2 3.6

Velocity km/sec 506.4 565.6 59.2

Temp Degree K 164222.2 230166.7 65944.4

Bt nT 5.2 7.3 2.2

Bz nT -0.8 1.4 2.1
ACE status at shock detection point:
ACE SWEPAM status: Data values are Nominal
ACE MAG status: Data values are Nominal
=========================================================================
Confirm event at http://sec.noaa.gov/ace/MAG_SWEPAM_24h.html

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[Ulrich Rieth]

Last Update: 20 June 2003, 09:00 UTC (5:00 am EDT 20 June):

Aurora / Geomagnetic Activity Update:

The interplanetary disturbance associated with the class M6.8 major flare of 17
June passed the ACE spacecraft near 07:58 UTC on 20 June and impacted
the Earth's magnetosphere near 08:40 UTC. The disturbance may produce
periods of geomagnetic and auroral storm activity over the next 12 to 24 hours.
The middle latitude auroral activity watch remains active.

For additional information and discussion of real-time activity, visit http://www.spacew.com/aurora/forum.html .

Solar Update:

Region 386 continues to pose a threat for major flare activity. It has increased
slightly in magnetic complexity during the last 24 hours, increasing in both spot
count and penumbral area. Another major M or X class solar flare may be
observed from this region during the next 24 to 48 hours. If this occurs, the
associated CME could have a stronger impact on the Earth than previous
CMEs.