[1] Beside the GPS radio occultation measurements of the troposphere and ionosphere, the CHAMP satellite tracks presently up to 8 GPS satellites simultaneously for navigation. The received dual frequency GPS signals provide valuable information on the ionization state of the topside ionosphere and plasmasphere. This paper briefly describes a new developed model assisted technique to improve the...

The geomagnetic storm on 17 March 2015 had a strong impact the global navigation satellite systems (GNSS) positioning results in many GNSS Continuously Operating Reference Stations (CORS) Europe. analysis of system (GPS) observations Latvian CORS stations discovered this space weather event over whole country. appeared as moving cloud discrepancies across However, days before revealed other sma...

In the last decade GPS has become a valuable tool for determining various ionospheric and neutral atmospheric parameters. The presently existing global and regional networks of GPS ground stations (e.g. regional surveying offices, International GPS service IGS) open the opportunity to establish monitoring systems to estimate ionospheric and tropospheric/stratospheric key-parameters (e.g. electr...

6 [1] In this study, ionospheric solar flare effects on the total electron content (TEC) and 7 associated time rate of change (rTEC) derived from ground-based global positioning 8 system (GPS) receivers in the midday region are examined. The occurrence times and 9 locations of 11 solar flares are isolated from the 1–8 Å X-ray radiations of the 10 geosynchronous operational environmental satelli...

[1] Several chains of receivers, measuring total electron content (TEC) during passes of satellites in the U.S. Navy Ionospheric Measuring System (NIMS), are operated at northern high latitudes by members of the International Ionospheric Tomography Community (IITC). Results are presented here of nearly simultaneous latitude-altitude images of the ionosphere over Scandinavia, Greenland, and Alas...

• Quiet time seasonal trend in TEC is not seen during disturbed periods of low solar activity. difference between and quiet higher the moderate The correlation day maximum with F 10.7 found to be reduced periods. present study focused understand geomagnetic storm effects on short- long-term variations ionospheric Total Electron Content (TEC) over equatorial latitude sectors. GPS-TEC observation...

The inversion of electron density from total electron content (TEC) measurements of GPS radio occultation is investigated by means of simulated data from the International Reference Ionosphere IRI-2001 and observations by the GPS/MET satellite experiment. In both cases a meridional slice of electron density is derived for northern summer solstice June/July 1995 from the midnight to the noon sec...

The Sporadic-E (Es) layer is an often-observed phenomenon at high latitudes; however, our understanding of the polar cap Es severely limited due to scarce number measurements. Here, first comprehensive study associated with Global Positioning System (GPS) Total Electron Content (TEC) variations and scintillations presented multiple measurements Resolute, Canada (Canadian Advanced Digital Ionoso...