- Announcements - lists.irowg.org

the ground tracker tool is added to the STAR data download homepage
by Shu-peng Ho - NOAA Federal 15 Aug '25

15 Aug '25

Dear all, Thanks for downloading more than 75 TB of STAR-processed RO data in the past two months. We have recorded more than 1700 users who have downloaded our data. We are pleased to announce that a new ground tracker function has been added to our STAR data download homepage (*https://gpsmet.umd.edu/gnssro/index.php <https://gpsmet.umd.edu/gnssro/index.php>).* Please click the "Ground Tracker" tab at the top of the page. You may email me or our data manager, Dr. Xi Shao (xi.shao(a)noaa.gov) for further comments. Enjoy Ben *==============================================* *Shu-peng Ben Ho, Ph. D.* *GNSS Radio Occultation** Program Lead Scientist* *NESDIS RO Science and Quality Assessment Grant Manager* *NOAA Center for Satellite Applications and Research (STAR)* *NCWCP, E/RA-21 Office# 2824* *5830 University Research Court, * *College Park, MD 20740-3818* *Tel : (301) 683-3596* *Email: shu-peng.ho(a)noaa.gov <shu-peng.ho(a)noaa.gov>* *STAR GNSS RO Center: **https://gpsmet.umd.edu/gnssro/index.php <https://gpsmet.umd.edu/gnssro/index.php>* *STAR GNSS RO Data Service: **https://gpsmet.umd.edu/gnssro/download.php <https://gpsmet.umd.edu/gnssro/download.php>* *Publication: researchgate.net/profile/Shu-Peng-Ho/publications <http://researchgate.net/profile/Shu-Peng-Ho/publications>* *==============================================*

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Reference for IROWG-10 Meeting Summary and Recommendations
by Hui Shao 25 Jul '25

25 Jul '25

Dear IROWG colleagues, With contributions from many of you, an overview of the IROWG-10 meeting highlights— including subgroup key discussion points and plenary recommendations—has been published in *Bulletin of the American Meteorological Society (BAMS)*. This paper can serve as a formal reference for IROWG-10 outcomes and community priorities in GNSS-based remote sensing: Shao, H., Foelsche, U., Mannucci, A. J., Azeem, I., Bowler, N. E., Braun, J. J., Lonitz, K., Marquardt, C., Steiner, A. K., Ruston, B., & Vergados, P. (2025). *Advances in GNSS-Based Remote Sensing for Weather, Climate, and Space Weather: Missions, Applications, and Emerging Techniques. **Bulletin of the American Meteorological Society*, 106(7), E1471–E1477. https://doi.org/10.1175/BAMS-D-25-0138.1 Thank you to everyone who helped make IROWG-10 a success. We look forward to seeing you at our next meeting! Best regards, Hui ====================================== Hui Shao Co-Chair of IROWG UCAR/Joint Center for Satellite Data Assimilation ======================================

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STAR-processed daily commercial RO data are available on line
by Shu-peng Ho - NOAA Federal 22 Jul '25

22 Jul '25

Dear colleagues, I am very pleased to inform you that the STAR-processed (with a 90-120 minutes latency, although released daily for now) NOAA commercial RO (i.e., PlanetiQ and Spire since Jan. 2025) is available from https://gpsmet.umd.edu/gnssro/download_star_nrt.php We are still refining our quality controls, excess phase processing, and improving our GNSS POD prediction algorithm. In general, these results demonstrate that the STAR-processed results are consistent with those from the references (ECMWF forecast and UCAR's results). We also added a function to track users and data downloads(for all the STAR data) on https://gpsmet.umd.edu/gnssro/download_stats.php. We are pleased to have had at least 1,600 individual users download around 42 TB in the past two months. Any feedback, suggestions, and questions on these data and other STAR-processed data are welcome (shu-peng.ho(a)noaa.gov and xi.shao(a)noaa.gov) Best regards, Ben *==============================================* *Shu-peng Ben Ho, Ph. D.* *GNSS Radio Occultation** Program Lead Scientist* *NESDIS RO Science and Quality Assessment Grant Manager* *NOAA Center for Satellite Applications and Research (STAR)* *NCWCP, E/RA-21 Office# 2824* *5830 University Research Court, * *College Park, MD 20740-3818* *Tel : (301) 683-3596* *Email: shu-peng.ho(a)noaa.gov <shu-peng.ho(a)noaa.gov>* *STAR GNSS RO Center: **https://gpsmet.umd.edu/gnssro/index.php <https://gpsmet.umd.edu/gnssro/index.php>* *STAR GNSS RO Data Service: **https://gpsmet.umd.edu/gnssro/download.php <https://gpsmet.umd.edu/gnssro/download.php>* *Publication: researchgate.net/profile/Shu-Peng-Ho/publications <http://researchgate.net/profile/Shu-Peng-Ho/publications>* *==============================================*

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Recall: Re: International Conference on GPS Radio Occultation (ICGPSRO) will be held on 28-30 October 2025
by Jade Morton 17 Jul '25

17 Jul '25

jade.morton(a)Colorado.EDU would like to recall the message, "Re: [IROWG Announcements] International Conference on GPS Radio Occultation (ICGPSRO) will be held on 28-30 October 2025".

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International Conference on GPS Radio Occultation (ICGPSRO) will be held on 28-30 October 2025
by Jan-Peter Weiss 17 Jul '25

17 Jul '25

Dear Colleagues, We are pleased to announce the 7th International Conference on GPS Radio Occultation (ICGPSRO) 2025. The conference will be held on 28-30 October 2025 at the National Cheng Kung University, Tainan, Taiwan. This is the first time we will host the conference in Tainan <https://www.taiwanobsessed.com/tainan-taiwan-guide>, the first capital of Taiwan, only 1.5 hours from Taipei by high speed rail. The conference will address the scientific progresses of radio occultation missions and advanced GNSS technologies for the exploration of meteorology, climate, and space science. Tentative solicited topics are as follows. 1. Missions and programs (new missions and operations) 2. Retrieval methodology and science 3. Numerical weather prediction data assimilation advances and validation studies 4. Atmospheric physics and climate 5. Space weather 6. GNSS-Reflectometry 7. Innovative GNSS technologies A meeting website will soon be opened for registrations and abstract submissions. We will keep you updated. Looking forward to seeing you in Tainan, Taiwan. Charles Lin and Jan-Peter Weiss on behalf of the organizing committee. 1. Vick Chu (Executive Vice Director of TASA) 2. Jan-Peter Weiss (UCAR COSMIC) 3. Cheng-Yun Huang (FORMOSAT-7/COSMIC-2 Program Director, TASA) 4. Wen-Hao Yeh (TRITON Mission Program Director, TASA) 5. Shu-Chih Yang (Department of Atmosphere Science, NCU) 6. Su-Ya Chen (GPS-ARC, NCU) 7. Nick Pedatella (NCAR HAO) 8. Charles Lin (Department of Earth Sciences, NCKU)

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Third GNSS-PRO Workshop in November 2025 - Registration now open
by Christian Marquardt 17 Jul '25

17 Jul '25

My apologies - now with hopefully correct links. ________________________________ Dear all, The “3rd GNSS Polarimetric Radio Occultations Workshop” will take place 10-12 November 2025, at the EUMETSAT headquarters in Darmstadt, Germany. Registration is now available at the workshop main page: https://www.eventsforce.net/gnsspro2025 This third workshop follows on to the “2nd GNSS Polarimetric Radio Occultation workshop<https://doi.org/10.1175/BAMS-D-24-0050.1>” from 2023. It represents a forum for addressing multiple uses and applications that have been studied in the seven years that polarimetric RO (PRO) data have been available, align the presentation of these results, and prepare recommendations for meteorological, space and research organizations (e.g., CGMS agencies, the EUMETSAT ROM SAF) and satellite data providers. The workshop will feature presentations and discussions in the following areas: * Status of current and future polarimetric-capable RO observations * Precipitation, convection, extreme precipitation events * Use of PRO to evaluate model microphysical parameterization schemes * NWP and climate model evaluation * Assimilation of PRO observations * Simulations and comparisons between PRO and passive MW radiances * Recommendations to space agencies and data providers * ROM SAF consultation process While the workshop will offer a hybrid attendance format, in-person attendance is encouraged. If you would like to present materials at the workshop, you can enter (even a tentative) title at the time of registration. An abstract is not required. Further information and an agenda will be provided after registration closes. With kind regards, Christian Marquardt on behalf of Estel Cardellach (IEEC) and Joe Turk (JPL) -- Dr. Christian Marquardt, Radio Occultation Team Leader EUMETSAT, Eumetsatallee 1, D-64295 Darmstadt, Germany Tel: +49-6151-8074560, Fax: +49-6151-807304 Email: christian.marquardt(a)eumetsat.int<mailto:christian.marquardt@eumetsat.int>, Web: http://www.eumetsat.int<http://www.eumetsat.int/> -- Dr. Christian Marquardt, Radio Occultation Team Leader EUMETSAT, Eumetsatallee 1, D-64295 Darmstadt, Germany Tel: +49-6151-8074560, Fax: +49-6151-807304 Email: christian.marquardt(a)eumetsat.int, Web: http://www.eumetsat.int<http://www.eumetsat.int/> Any email message from EUMETSAT is sent in good faith but shall neither be binding nor construed as constituting a commitment by EUMETSAT, except where provided for in a written agreement or contract or if explicitly stated in the email. Please note that any views or opinions presented in this email are solely those of the sender and do not necessarily represent those of EUMETSAT. This message and any attachments are intended for the sole use of the addressee(s) and may contain confidential and privileged information. Any unauthorised use, disclosure, dissemination or distribution (in whole or in part) of its contents is not permitted. If you received this message in error, please notify the sender and delete it from your system.

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Third GNSS-PRO Workshop in November - Registration is now open
by Christian Marquardt 17 Jul '25

17 Jul '25

Dear all, The “3rd GNSS Polarimetric Radio Occultations Workshop” will take place 10-12 November 2025, at the EUMETSAT headquarters in Darmstadt, Germany. Registration is now available at the workshop main page<https:/www.eventsforce.net/gnsspro2025>: https://www.eventsforce.net/gnsspro2025<https:/www.eventsforce.net/gnsspro2025> This third workshop follows on to the “2nd GNSS Polarimetric Radio Occultation workshop<https:/doi.org/10.1175/BAMS-D-24-0050.1>” from 2023. It represents a forum for addressing multiple uses and applications that have been studied in the seven years that polarimetric RO (PRO) data have been available, align the presentation of these results, and prepare recommendations for meteorological, space and research organizations (e.g., CGMS agencies, the EUMETSAT ROM SAF) and satellite data providers. The workshop will feature presentations and discussions in the following areas: * Status of current and future polarimetric-capable RO observations * Precipitation, convection, extreme precipitation events * Use of PRO to evaluate model microphysical parameterization schemes * NWP and climate model evaluation * Assimilation of PRO observations * Simulations and comparisons between PRO and passive MW radiances * Recommendations to space agencies and data providers * ROM SAF consultation process While the workshop will offer a hybrid attendance format, in-person attendance is encouraged. If you would like to present materials at the workshop, you can enter (even a tentative) title at the time of registration. An abstract is not required. Further information and an agenda will be provided after registration closes. With kind regards, Christian Marquardt on behalf of Estel Cardellach (IEEC) and Joe Turk (JPL) -- Dr. Christian Marquardt, Radio Occultation Team Leader EUMETSAT, Eumetsatallee 1, D-64295 Darmstadt, Germany Tel: +49-6151-8074560, Fax: +49-6151-807304 Email: christian.marquardt(a)eumetsat.int, Web: http://www.eumetsat.int<http://www.eumetsat.int/> Any email message from EUMETSAT is sent in good faith but shall neither be binding nor construed as constituting a commitment by EUMETSAT, except where provided for in a written agreement or contract or if explicitly stated in the email. Please note that any views or opinions presented in this email are solely those of the sender and do not necessarily represent those of EUMETSAT. This message and any attachments are intended for the sole use of the addressee(s) and may contain confidential and privileged information. Any unauthorised use, disclosure, dissemination or distribution (in whole or in part) of its contents is not permitted. If you received this message in error, please notify the sender and delete it from your system.

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Call for Abstracts - AMS 2026 GNSS Science and Technology Session
by Nelson, Kevin J (US 335G) 09 Jul '25

09 Jul '25

Dear colleagues, We would like to draw your attention to a session at the 106th American Meteorological Society Annual Meeting <https://annual.ametsoc.org/2026/> in Houston, TX, USA from January 25 to 29, 2026. Our session is focused on the use of GNSS technology for observations within Atmospheric Science and related disciplines and is intended to be a companion session of the corresponding AGU 2025 session<https://agu.confex.com/agu/agu25/prelim.cgi/Session/251767>: Advancing Earth System Science Research using Global Navigation Satellite Systems Technology. Please see below for more information. Conference Name: 22nd Symposium on Operational Environmental Satellite Systems (joint between 16th Conference on Transition of Research to Operations) Session Name: Atmospheric Science Applications of Global Navigation Satellite Systems Technology Across Scales Session Description: Remote sensing observations that utilize Global Navigation Satellite System (GNSS) signals have been used in geophysical research for decades. GNSS signals are particularly useful for various forms of geophysical research due to its high precision and capability to penetrate clouds and precipitation. GNSS observation techniques such as radio occultation (GNSS-RO) and reflections (GNSS-R) provide high-quality, globally distributed atmospheric retrievals useful in a wide variety of research. Their retrievals also greatly contribute to numerical simulation systems through data assimilation for accurate climate analysis and weather forecasts. This session welcomes submissions including, but not limited to the following topics: 1. Complementary observations of GNSS and other remote sensing or in-situ data for understanding atmospheric processes across scales, 2. Impacts and effects of GNSS observations on numerical weather prediction of significant weather events and data assimilation strategies for GNSS observations, 3. GNSS observations of high-impact weather, such as tropical cyclones, fire weather, atmospheric rivers, and their implications for understanding extreme events, and 4. GNSS remote sensing novel observing concepts such as polarimetric GNSS observations, grazing reflections, and airborne retrievals, and their usefulness for filling observational gaps. As a reminder, AMS 2026 abstracts are due on August 14, 2025 by 17:00 EDT. Submit your abstracts here<https://annual.ametsoc.org/2026/program-events/conferences-and-symposia/22n…>! See you in New Orleans! Kevin J. Nelson – NASA Jet Propulsion Laboratory Kuo-Nung Wang – NASA Jet Propulsion Laboratory Feiqin Xie – Texas A&M University – Corpus Christi Jade Morton – University of Colorado – Boulder Ramon Padullés – Instituto de Ciencias del Espaceio (ICE-CSIC/IEEC) F. Jospeh Turk – NASA Jet Propulsion Laboratory

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Call for Abstracts - AGU 2025 GNSS Science and Technology Session
by Nelson, Kevin J (US 335G) 09 Jul '25

09 Jul '25

Dear colleagues across many geoscientific disciplines, We would like to draw your attention to a broad AGU annual meeting <https://www.agu.org/annual-meeting> session focused on the use of GNSS technology for observations within Earth System Science and Geoscience disciplines. This session<https://agu.confex.com/agu/agu25/prelim.cgi/Session/251767>, while hosted by atmospheric science, is cross listed in the AGU program with natural hazards, geodesy, and atmospheric and space electricity. Please considered submitting your promising research to this session! Session Name: A013 – Advancing Earth System Science Research using Global Navigation Satellite Systems Technology Session Description: Global Navigation Satellite System (GNSS) signals have been used in geophysical research for decades due to its reliable signal sources, high precision, and capability to penetrate clouds and precipitation. As such, the expansion of commercial and government back-bone GNSS observations such as radio occultations (GNSS-RO), GNSS reflections (GNSS-R), and the expanding network of ground stations have received significant investment in past years. These various GNSS observation techniques provide high-quality globally distributed atmospheric, ionospheric, and surface retrievals useful in a wide variety of research. Other new GNSS instrumentation concepts such as polarimetric RO (PRO), LEO-LEO multi-frequency occultations, and grazing reflections can also contribute greatly to GNSS remote sensing. This session welcomes submissions including, but not limited to the following topics: 1. Utilization of GNSS remote sensing technology to improve understanding of atmospheric processes, including the planetary boundary layer and extreme weather, 2. Novel atmospheric/surface science applications, such as hydrology, altimetry, or natural hazards, as a result of GNSS remote sensing observations, 3. State-of-the-art atmospheric, surface property, and ionospheric retrieval algorithm developments, also including joint retrievals, data fusion, and machine learning/artificial intelligence, and 4. GNSS remote sensing technology advancement and novel observing concepts such as polarimetric observations, grazing reflections, next generation GNSS observing constellations, and other signals of opportunity (SoOp) remote sensing systems Abstract submissions are due July 30, 2025 at 03:59 UTC. Submit your abstracts here<https://agu.confex.com/agu/agu25/prelim.cgi/Session/251767>! See you in Washington, D.C.! Kuo-Nung Wang – NASA Jet Propulsion Laboratory Kevin J. Nelson – NASA Jet Propulsion Laboratory Ramon Padullés – Institute of Space Sciences ICE-CSIC, IEEC Zhuoyi Zhao – University of Colorado Boulder Jade Morton – University of Colorado Boulder

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3rd Polarimetric Radio Occultation Workshop - Save the dates!
by Estel Cardellach 26 Jun '25

26 Jun '25

*The Third Polarimetric Radio Occultations Workshop will take place on10-12 November 2025 at EUMETSAT HQ in Darmstadt, Germany.* The meeting will be in a hybrid format. IROWG and ITWG members are encouraged to participate. In person is preferred. A proper announcement with more details will be sent soon, for now, please _save the dates_! Estel, Joe, Christian

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