[IGSMAIL-8100] Announcement GFZ global TEC maps

[Andreas Brack]

Dear colleagues,

we are pleased to announce global ionosphere maps as a new GFZ GNSS 
product. The solutions are computed with our in-house EPOS.P8 software 
using GPS, GLONASS, and Galileo data. The processing is based on a 
rigorous least-squares approach using uncombined code and phase 
observations, and does not include GF combinations or leveling 
techniques. At present, RAPID and FINAL solutions are provided in the 
IONEX format.

The products are provided via the GFZ Information System and Data Center 
(https://isdc.gfz-potsdam.de/gnss-products) and available from 2000. For 
further information, please refer to:

  * Brack, A., Männel, B., Wickert, J., Schuh, H. (2021) Operational
    Multi-GNSS Global Ionosphere Maps at GFZ Derived from Uncombined
    Code and Phase Observations, Radio Science.
    https://doi.org/10.1029/2021RS007337
  * Brack, A., Männel, B., Bradke, M., Brandt, A., Nischan, T. (2021):
    GFZ Global Ionosphere Maps. GFZ Data Services.
    https://doi.org/10.5880/GFZ.1.1.2021.006

Starting from GPS week 2171 (i.e., from 2021_227), the GFZ GIMs are used 
for the second order ionospheric corrections in the GFZ FINAL processing.

Best regards,
Andreas Brack, on behalf of the GFZ AC team
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