[evlatests] L-Band WIDAR Woes

[Bryan Butler]

the sun has been fairly active of late.  sunspot 1024 was nearly 
constantly flaring over the past week or more (it's about to go over the 
limb now).  see, e.g., 
http://blogs.discovery.com/space_disco/2009/07/the-fouth-of-july-celebrated-solar-style.html

if you know what day the data was taken, you can go to the SOHO website 
and get a picture from that day/time...

it's conceivable that the sun was behaving badly.

this is only going to get worse over time.  though we just went through 
solar min (last december) - we're now ramping up to the solar max 
predicted to be in early 2013...

	-bryan


Rick Perley wrote, On 7/10/09 09:38:
> It is perhaps possible that they are due to solar interference 
> -- the observations were taken in late afternoon -- except that some 
> baselines (2 x 18 -- E2 x N16 is an excellent example) show a clear 
> double beat, with a long period variation of period 90 seconds 
> superposed on a fast oscillation of 4 seconds.  I don't know how any 
> single external source can do such a thing.   In any event, I'm not 
> aware that the sun is up to anything recently -- if any of you have 
> information on this, let me know.   We'd have to be seeing nearly MegaJy 
> structure on the Sun in order to get ~25 Jy residuals on our northern 
> source, which is about 50 degrees away from the sun. 
>