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    Re: Susceptibility of GPS to CME, Rationale for CN?
    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!
    -----Original Message-----
    From: NavList@fer3.com [mailto:NavList@fer3.com] 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: 
    (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: 
    -- Richard Langley
    [plain text auto-generated]
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