[SAS] possible aurora action August 4th

From: "Eide, Phyllis" <eide@xxxxxxx>
To: "sas@xxxxxxxxxxxxx" <sas@xxxxxxxxxxxxx>
Date: Fri, 4 Aug 2017 01:24:27 +0000

FYI..... (assuming we can see anything thru the smoke in the air!!)
Phyllis

GEOMAGNETIC STORM WATCH (G2-CLASS): NOAA forecasters say there is an 80% (not a
typo!) chance of polar geomagnetic storms on Aug. 4th when a solar wind stream
is expected to envelop Earth's magnetic field. The wind is flowing from a
canyon-shaped hole in the sun's atmosphere, shown here in an extreme
ultraviolet image from NASA's Solar Dynamics Observatory:

<http://spaceweather.com/images2017/03aug17/latest_2048_211193171.jpg?PHPSESSID=2aqiq9r0l0cq9r1r5voe9qf8r4>
This is a coronal hole (CH), a region where the sun's magnetic field peels back
and allows gaseous material to escape. The resulting solar wind is traveling
toward us faster than ~600 km/s. Geomagnetic storm levels could reach
G2<http://spaceweather.com/glossary/g2.jpg?PHPSESSID=2aqiq9r0l0cq9r1r5voe9qf8r4>-category
(moderately strong) during the late hours of Aug. 4th, subsiding to
G1<http://spaceweather.com/glossary/g1.jpg?PHPSESSID=2aqiq9r0l0cq9r1r5voe9qf8r4>-category
(minor) on Aug. 5th. High-latitude sky watchers should be alert for auroras
mixed with waxing gibbous moonlight.

http://spaceweather.com/

Follow-Ups:
- [SAS] Re: possible aurora action August 4th
  - From: Nick Monkman

[SAS] possible aurora action August 4th

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