NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Susceptibility of GPS to CME, Rationale for CN?
From: Francis Upchurch
Date: 2018 Sep 30, 06:40 +0100
From: Francis Upchurch
Date: 2018 Sep 30, 06:40 +0100
Does CME affect quartz watches? I keep my 4 cheap backups in a thermos flask
stowed in a metal box ("Faraday cage").Should be safe?
I knew I might find a practical use for my mechanical Invicta watch (cheap
Rolex Submariner copy) which keeps regular time + 4-8 secs per day over the
last 2 years.
On the philosophy of time. Enjoy life and do it now. It is later than you think!
Francis
-----Original Message-----
From: NavList@navlist.net [mailto:NavList@navlist.net] On Behalf Of Richard B. Langley
Sent: 29 September 2018 13:46
To: francisupchurch@gmail.com
Subject: [NavList] Re: Susceptibility of GPS to CME, Rationale for CN?
" The paucity of precise data from prior solar cycles may limit your ability
to predict future levels of activity."
It's impossible to predict when a strong solar flare or CME large enough to
disrupt GNSS might occur. They can even strike near the minimum of the
roughly 11-year solar cycle. Most outbursts are not severe enough to prevent
GNSS being used but simply reduce positioning accuracy with the vertical
coordinate (as is always the case) being a few times worse than the
horizontal coordinates. Potentially more impactful are strong solar radio
storms, which drown out the GPS signals. NOAA reported on such a storm in
December 2006 here:
https://web.archive.org/web/20071213212715/http://www.noaanews.noaa.gov/stories2007/s2831.htm
(from the "Wayback Machine" as the original item is missing or got moved on
the NOAA site).
Much more impactful would be a repeat of the 1859 Carrington Event:
https://science.nasa.gov/science-news/science-at-nasa/2008/06may_carringtonflare
-- Richard Langley
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