[time-nuts] NIST

[Bob kb8tq]

Hi

> On Aug 30, 2018, at 12:58 PM, Peter Laws <plaws0 at gmail.com> wrote:
> 
> On Mon, Aug 13, 2018 at 8:52 AM Peter Laws <plaws0 at gmail.com> wrote:
> 
> 
>> I have yet to hear anyone make a case for retaining the HF system that
>> isn't backed by nostalgia.
> 
> Still looking for this.  Most of the "OMG IF WWV GOES AWAY MILLIONS
> WILL DIE" posts (elsewhere, not here ... quite ...) are the type of
> hysteria that is usually reserved for, I don't know, the EMP folks.
> :-)
> 
> 
>> As for solar flares taking out the various GNSSs ... wouldn't a solar
>> flare only take out the vehicles that were on the "sunny" side of the
>> Earth?  Wouldn't the (approximately) half of the SVs that are in the
>> Earth's shadow be unaffected?  Serious technical question - I have no
>> idea.
> 
> One of the responses to my initial message pointed out that the
> effects of solar flares and CMEs take a while to get from Sol to Sol
> III and don't arrive all at once, so potentially all GNSS spacecraft
> could be affected.
> 
> Since then, I've been poking around for papers on the effect
> (observed, potential, theoretical) of these events on the Navstar or
> other GNSS constellations but am not having much luck.  I assume it's
> because I'm not putting the right magic incantation into the google
> machine.
> 
> Anyone got some cites?  Looking for the effect of solar flares and
> CMEs on the spacecraft themselves and not how the GNSSs can be used to
> measure the effects on the ionosphere, etc (those seem plentiful).
> IOW, I'm curious about the resiliency of the systems to solar events.
> 
> I did note that at the time of the 1989 solar event that took out a
> lot of Hydro Quebec's grid, only the "Block I" experimental GPS "SVs"
> were in orbit.  Well, maybe a couple of the later ones - the
> operational constellation started launching about a month before that
> flare.
> 

There most certainly was a lot of “stuff” in orbit by that time. If there was 
a mass die off of satellites, you would not have to look hard to find out about
it. 

Bob

> As I said initially, I'll be sad if WWV* goes away but it won't affect
> my life in any measurable way that I can see.  I mean, other than the
> mantle clock slowly losing time.
> 
> -- 
> Peter Laws | N5UWY | plaws plaws net | Travel by Train!
> 
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