[teqc] Re: cycle slips

Erricos C. Pavlis epavlis at umbc.edu
Fri Mar 26 13:03:29 MDT 2010


Hi Nacho,

You can follow the events and the forecast by downloading "the  
weekly", NOAA's electronic publication on Space Weather. I attach the  
latest issue for your reference. Some of the best sites to visit  
would be:

NOAA:  http://www.swpc.noaa.gov/

http://www.spaceweather.com/

and for policy, activities, etc. at government level:

http://www.nswp.gov/

I am sure that there are similar sites in Europe, I am just not  
familiar with those. By the way, solar cycle 23 has been too slow to  
end and it now seems that the next one is rushing to begin with a  
fast pace (see the NOAA prediction graph in terms of sunspots).

I hope this helps,

ecp

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On Mar 26, 2010, at 2:46 PM, Lou Estey wrote:

> hi Nacho,
>
>> i am investigating a sudden rise and drop in cycle slips in my  
>> region.
>>  From your experience is a sudden rise of cycle slips over a region
>> limited to increased Iono activity or could the teqc values be  
>> pointing
>> in a different direction? many RINEX from many different receiver
>> vendors show the increase and then drop at the same time. Thanks  
>> for any
>> hints.
>
> Well, we're coming out of the latest solar minimum -- I don't know  
> exactly
> where we are at the moment because I don't follow that closely, but  
> this
> plot from NASA shows the solar activity (as measured indirectly by  
> sunspot
> density) could be coming on strong any time now:
>
> http://en.wikipedia.org/wiki/File:Sunspot-bfly.gif
> http://solarscience.msfc.nasa.gov/SunspotCycle.shtml
>
> so, yes, if that's the case, then we could expect to see sudden sharp
> increases in slips due to ionospheric activity.  (Detecting and  
> reporting
> such slips was one of the original motivations for the qc of GPS data
> in the late '80s and early '90s by Chris Rocken, Chuck Meertens, and
> others at UNAVCO at the time.)
>
> Maybe someone who more closely follows space weather could comment.
> http://solarcycle24.com/ shows various measures in the last hours or
> days (depending on the observable).  Is there a nice summary of  
> activity
> showing details of the last few months somewhere?
>
> cheers,
> --lou
>
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> Louis H. Estey, Ph.D.              office:  [+001] 303-381-7456
> UNAVCO, 6350 Nautilus Drive           FAX:  [+001] 303-381-7451
> Boulder, CO  80301-5554            e-mail:  lou  unavco.org
>    WWW:  http://www.unavco.org   http://jules.unavco.org
>
> "If the universe is the answer, what is the question?"
>                                                -- Leon Lederman
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> _______________________________________________
> teqc mailing list
> teqc at ls.unavco.org
> http://ls.unavco.org/mailman/listinfo/teqc
>


  +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
   Dr. Erricos C. Pavlis                Phone:              +1 (410)  
455-5832
   Research Scientist                  FAX:                  +1 (410)  
455-5868
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Mobile:      +1-240-381-9879
                                                       EU Mobile:     
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   Chair, ILRS Analysis Working Group

   Goddard Earth Science and Technology Center, (GEST/UMBC)
   University of Maryland, Baltimore County & NASA Goddard
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   U S A    21250                                                  
epavlis at umbc.edu

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