Fw: [PropNET-Online] FEMA Announces Severe Solar Weather
wb4jfi at knology.net
Thu Dec 14 11:48:47 CST 2006
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To: PropNET-Online at yahoogroups.com
Sent: Thursday, December 14, 2006 12:09 PM
Subject: [PropNET-Online] FEMA Announces Severe Solar Weather
Text from the 14 Dec Situation Report:
Sunspots Causing Communication Failures
On December 12, 2006 the NOAA observed a solar radiation storm on the
Sun that produced a powerful and fast Earth-directed coronal mass
ejection that is expected to impact the earth around 1:00 EST on
December 14th. The result of this significant geomagnetic storm is a
potential adverse effect on satellite communications, HF and VHF mid-
latitude radio communications, long-line telephone systems, power
grids (potentially causing blackouts), oil and gas pipelines, as well
as VLF navigation and GPS systems.
A sunspot is a region on the Sun's surface (photosphere) that is
marked by intense magnetic activity. NOAA monitors these occurrences
and issues Space Advisory Bulletins and Space Weather Scales,
introduced as a way to communicate to the general public the current
and future space weather conditions and their possible effects on
people and systems. The NOAA Scales describe the environmental
disturbances for three types of events: geomagnetic storms, solar
radiation storms, and radio blackouts. They list possible effects at
This solar storm occurrence is Bulletin #06-4 (severe). For the next
five days we could experience HF radio communication blackouts on
most of the sunlit side of the Earth for one or two hours. Outages of
low-frequency signals could cause minor satellite navigation
disruptions on the sunlit side of the earth.
Further information on NOAA Space Weather Scale for Radio Blackouts
Space Weather Advisories, Space Environmental Center)
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