[Cosmic_announce] Bug found and fixed in COSMIC ionospheric products

[Stig Syndergaard]

Hi Doug,

Is it all ionospheric data that is affected?
I'm curious if the bug was already at the level of bnx files, then it 
would have implications on podObs, podTec, and leoDcb as well. If so, do 
you plan to reprocess those too?

Regards,
-Stig

Doug Hunt wrote:
> Dear COSMIC connoisseurs:
> 
> A bug has been discovered in COSMIC ionPhs and ionPrf files on CDAAC.
> For certain satellites and days, ionPhs and ionPrf profiles are scrambled,
> showing many abrupt jumps.
> 
> This problem occurs for COSMIC satellites which have SNR problems on one
> of the POD (Precise Orbit Determination) zenith-mounted antennas.  These
> satellites have had the failing antenna turned off and thus have only one
> POD antenna for tracking ionospheric occultations.  A bug in CDAAC
> software improperly mixed data from duplicate tracks on the single POD
> antenna.
> 
> A software patch was applied on day 2009.076 to fix this bug in the
> real-time COSMIC processing.  We will fix the problem in the
> post-processed data and send out a separate announcement when this is
> complete.
> 
> Thanks to Qian Wu (NCAR HAO) and Woo-Kyoung Lee (HAO and KASI, Korea) for
> finding this problem.
> 
> Regards,
> 
>    Doug Hunt
> 
> dhunt at ucar.edu
> Software Engineer IV
> UCAR - COSMIC, Tel. (303) 497-2611
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-- 
__________________________________________________________________
Stig Syndergaard, PhD
Danish Meteorological Institute              Phone: +45 39 157 408
Lyngbyvej 100                                  Fax: +45 39 157 460
DK-2100 Copenhagen                              E-mail: ssy at dmi.dk
__________________________________________________________________