[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/


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


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,


-------------- next part --------------
A non-text attachment was scrubbed...
Name: SpaceWeatheHighlights_prf1803.pdf
Type: application/pdf
Size: 225295 bytes
Desc: not available
Url : http://ls.unavco.org/pipermail/teqc/attachments/20100326/5a534391/SpaceWeatheHighlights_prf1803-0001.pdf
-------------- next part --------------
A non-text attachment was scrubbed...
Name: sunspot.gif
Type: image/gif
Size: 17761 bytes
Desc: not available
Url : http://ls.unavco.org/pipermail/teqc/attachments/20100326/5a534391/sunspot-0001.gif
-------------- next part --------------

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)  
   Research Scientist                  FAX:                  +1 (410)  
Mobile:      +1-240-381-9879
                                                       EU Mobile:     

   Chair, ILRS Analysis Working Group

   Goddard Earth Science and Technology Center, (GEST/UMBC)
   University of Maryland, Baltimore County & NASA Goddard
   Academic IV  Wing A  Suite 114E
   1000 Hilltop Circle
   Baltimore, Maryland
   U S A    21250                                                  
epavlis at umbc.edu


More information about the teqc mailing list