For those who were unaware strong Solar Storm activity will have an effect on GPS accuracy (see http://www.sec.noaa.gov/nav/gps.html )
Not to mention some really cool effects on the sky if you are in the right area.
You may also be interested in the following info and links...
MIDDLE LATITUDE AURORAL ACTIVITY WATCH
ISSUED: 09:00 UTC, 23 OCTOBER 2001
VALID BEGINNING AT: 17:00 UTC (1 pm EDT) ON 24 OCTOBER
VALID UNTIL: 19:00 UTC (3 pm EDT) ON 26 OCTOBER
HIGH RISK PERIOD: 24 OCT - 25 OCTOBER (UTC DAYS)
MODERATE RISK PERIOD: 24 OCT - 26 OCTOBER
PREDICTED ACTIVITY INDICES: 14, 20, 40, 12 (23 OCT - 26 OCT)
POTENTIAL MAGNITUDE OF MIDDLE LATITUDE AURORAL ACTIVITY: MODERATE
POTENTIAL DURATION OF THIS ACTIVITY: MAIN BELT = 18 TO 24 HOURS
MINOR BELT = 24 TO 36 HOURS
ESTIMATED OPTIMUM OBSERVING CONDITIONS: NEAR & AFTER LOCAL MIDNIGHT
EXPECTED LUNAR INTERFERENCE: LOW TO MODERATE
OVERALL OPPORTUNITY FOR OBSERVATIONS FROM MIDDLE LATITUDES: FAIR TO GOOD
AURORAL ACTIVITY *MAY* BE OBSERVED APPROXIMATELY NORTH OF A LINE FROM...
OREGON TO NORTHERN UTAH TO NEBRASKA TO NORTHERN MISSOURI TO ILLINOIS TO
INDIANA TO NORTHERN KENTUCKY TO SOUTHERN OHIO TO WEST VIRGINIA TO
ACTIVITY *MAY* ALSO BE OBSERVED APPROXIMATELY NORTH OF A LINE FROM...
UNITED KINGDOM TO EXTREME NORTHERN NETHERLANDS TO NORTHERN GERMANY TO
NORTHERN POLAND TO LITHUANIA TO LATVIA AND ESTONIA TO NORTHERN RUSSIA.
SOUTHERN REGIONS OF NEW ZEALAND MAY ALSO BE ABLE TO SPOT PERIODS OF
Two additional major solar flares occurred on 22 October that may have
been associated with Earthward directed coronal mass ejections. Coverage of
these events by the SOHO spacecraft was spotty at best, but sufficient data
is now available to confirm that at least one large coronal mass ejection
(possibly with a second imbedded one) is headed Earthward. Impact of this
disturbance with the Earth's magnetosphere is expected either late in the UTC
day of 24 October (afternoon hours EDT) or early in the UTC day of 25 October
(evening EDT hours of 24 October).
This watch will remain in effect until 19:00 UTC (3 pm EDT) on 26
October. It will then be updated or allowed to expire. For updated
information, visit: http://www.spacew.com/aurora/forum.html