[time-nuts] Possible GPS Interference test

[John Ackermann N8UR]

A long, long time ago I captured a solar flare while monitoring GPS 
signal strength:

http://febo.com/pages/gps_solar_flare/

There was a very significant drop in signal level.  Unfortunately, I 
wasn't able to capture any phase data that corresponded to the event.

John
----

On 9/30/2015 3:15 PM, Mike Millen wrote:
> Would this sunspot activity have anything to do with it?
>
> http://spaceweather.com/
>
> Mike
>
>
> On 30/09/2015 18:18, Tim Shoppa wrote:
>> I went ahead and did the math based on some of your numbers. I was a
>> little
>> unclear on which numbers to use.
>>
>> -2E-10 in frequency over 5 minutes, is -60ns. 60ns is not completely
>> unreasonable for an ionospheric delay variation over hours, but I
>> think it
>> would be unusual for there to be so much tumult in just 5 minutes though.
>> (Especially when geophysical K index has been particularly calm lately.)
>>
>> On the other hand, -2E-10 over 3 hours, is -2 microseconds which is just
>> huge!
>>
>> Do you have anything like a graph of phase difference or EFC over those 3
>> hours?
>>
>> Tim N3QE
>>
>> On Wed, Sep 30, 2015 at 1:54 AM, James Flynn <james.flynn at csun.edu>
>> wrote:
>>
>>> I recorded apparent anomalous activity on the GPS signal received
>>> near Los
>>> Angeles from about 0200Z to 0500Z 30 Sept. The 1PPS received signal
>>> shifted by -2E-10 in frequency (5 minute averages).
>>>
>>> There is a notice on the GPS website about possible interference
>>> today (29
>>> Sept) through 30 Sept in the area of 253 nm around China Lake, CA.
>>> (which
>>> includes Los Angeles)
>>>
>>> Anyone else near LA notice anything?
>>>
>
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