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<p>Dear colleagues,<br>
<br>
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.<br>
<br>
The products are provided via the GFZ Information System and Data
Center (<a class="moz-txt-link-freetext"
href="https://isdc.gfz-potsdam.de/gnss-products">https://isdc.gfz-potsdam.de/gnss-products</a>)
and available from 2000. For further information, please refer to:<br>
</p>
<ul>
<li>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. <a
class="moz-txt-link-freetext"
href="https://doi.org/10.1029/2021RS007337">https://doi.org/10.1029/2021RS007337</a></li>
<li>Brack, A., Männel, B., Bradke, M., Brandt, A., Nischan, T.
(2021): GFZ Global Ionosphere Maps. GFZ Data Services. <a
class="moz-txt-link-freetext"
href="https://doi.org/10.5880/GFZ.1.1.2021.006">https://doi.org/10.5880/GFZ.1.1.2021.006</a><br>
</li>
</ul>
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.<br>
<br>
Best regards,<br>
Andreas Brack, on behalf of the GFZ AC team
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