Hi > On Aug 30, 2018, at 12:58 PM, Peter Laws <pla...@gmail.com> wrote: > > On Mon, Aug 13, 2018 at 8:52 AM Peter Laws <pla...@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! > > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.