[Cosmic_announce] timestamps in filenames

[Stig Syndergaard]

Hi all,

This email is to announce a small change in the way CDAAC
assigns timestamps to filenames.

Currently the timestamps in occultation filenames indicate 
the approximate end of occultations. However, this time 
can be misleading, e.g., for atmospheric rising occs it 
is often the endtime of the ionospheric occ (5-10 minutes 
later than when the atmospheric occ took place). In other cases, 
when there are no ionospheric occ accompanying the atmospheric 
occ, the time is the approximate end of the atmospheric
occ. This and other logistic reasons have led to a decision to
revert to our old way (before Sep. 27, 2006) of assigning times
to the filenames:

Starting on Jan 23, 2007, timestamps, i.e., YYYY.DDD.HH.MM, in CDAAC 
occultation filenames will always correspond to a tangent point altitude 
of about 150 km for both atmospheric and ionospheric occultations, both
setting and rising.

This change only affects times in the filenames, not the filename
format, nor the content of the files where more exact timing info
can be found.

The CDAAC filetypes that will be affected by this change include:
ionObj
ionPhs
ionPrf
gpsBit
atmObj
atmPhs
atmPrf
avnPrf
wetPrf
bfrPrf

Regards,
The CDAAC Team