Fw: [PropNET-Online] FEMA Announces Severe Solar Weather

Terry Fox wb4jfi at knology.net
Thu Dec 14 11:48:47 CST 2006

----- Original Message ----- 
From: mike_mutascio 
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 
each level.

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 
available at: 

http://sec.noaa.gov/NOAAscales/index.html#GeomagneticStorms. (NOAA 
Space Weather Advisories, Space Environmental Center)


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