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(meteorobs) Be on the alert for aurorae Sunday night!
The shock wave from the first of two X-1 solar flares (which erupted late
on Thursday night) finally impacted the Earth's magnetosphere at 11:50 a.m.
EDT Sunday, October 21. The velocity of the solar wind jumped from 350 to
over 700 km./sec. soon after the shock wave hit. The interplanetary magnetic
field turned sharply south when the disturbance arrived, setting the stage
for a possible display of Northern Lights. Those US observers especially who
live north of a line from southern Oregon eastward to Salt Lake City, central
Kansas, central Kentucky on to the Delmarva Peninsula should frequently check
the northern sky beginning soon after darkness falls this evening (10/21).
The NOAA Space Environment Center, Space Weather Office in Colorado has
issued a Geomagnetic Storm Warning which will remain in effect through 11:00
a.m. EDT on Monday, October 21.
-- joe rao
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