[Ips-geo-warning] IPS GEOMAGNETIC WARNING

[rwc]

SUBJ: IPS GEOMAGNETIC DISTURBANCE WARNING 01/22
ISSUED AT 25/2308Z JUNE 2001
BY THE AUSTRALIAN SPACE FORECAST CENTRE.

REVIEWING LASCO DIFFERENCE IMAGERY, IT APPEARS THAT 
THERE WAS A WEAK HALO MASS EJECTION IN C3 IMAGERY AROUND 08UT 
ON 24 JUNE. TWO CANDIDATE C3 FLARES OCCCURED AROUND 0635UT AND 
0722UT ON 24 JUNE. IF THE MASS EJECTION WAS A FRONT DISK EVENT 
AND ASSOCIATED WITH EITHER OF THESE FLARE EVENTS THEN A WEAK 
SHOCK ARRIVAL IS PROBABLE FROM 22UT ON 26 JUNE TO 10UT ON 27 
JUNE. ALSO, ACE EPAM PRECURSOR DATA SHOWS AN INCREASING TREND. 

A LARGE ISOLATED CORONAL HOLE WHICH WAS VISIBLE ON YOHKOH SOFT 
XRAY IMAGES ON 29 MAY, APPEARS TO HAVE MOSTLY CLOSED ON IMAGES 
ON 25 JUNE. CORONAL HOLE EFFECTS ON THIS ROTATION ARE EXPECTED
TO BE MUCH REDUCED.

INCREASED GEOMAGNETIC ACTIVITY EXPECTED
FROM 27-29 JUNE 2001
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GEOMAGNETIC ACTIVITY FORECAST 
27 Jun:  Active  (CME) 
28 Jun:  Unsettled to Active   (coronal hole)
29 Jun:  Unsettled to Active   (coronal hole)


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