Ionospheric space weather effects monitored by simultaneous ground and space based GNSS signals

Abstract Ionospheric space weather effects can degrade the performance of global navigation satellite systems (GNSS), i.e. their accuracy, reliability and availability. However, well established ground based and innovative space based GNSS measurements offer the unique chance for a permanent monitoring of the electron density structure of the global ionosphere–plasmasphere system. In this paper we review various types of perturbations in the ionospheric plasma density and distribution. In order to analyze these space weather effects we use 30 s sampled measurements provided by the global GPS ground tracking network of the IGS. Furthermore, to get a more comprehensive view on the perturbations analyzed also are simultaneously obtained GPS measurements onboard the LEO satellite CHAMP (challenging minisatellite payload). Whereas the ground based measurements show strong horizontal redistribution of plasma during ionospheric storms, the space-borne measurements indicate a severe vertical redistribution of the ionospheric plasma during the selected events. The role of the various dynamical forces such as meridional winds and electric fields is also discussed.

[1]  Stefan Heise,et al.  A new method for reconstruction of the vertical electron density distribution in the upper ionosphere and plasmasphere , 2003 .

[2]  K. Davies,et al.  Recent progress in satellite radio beacon studies with particular emphasis on the ATS-6 radio beacon experiment , 1980 .

[3]  Stefan Heise,et al.  Space weather effects on transionospheric radio wave propagation on 6 April 2000 , 2002 .

[4]  S. Schlüter,et al.  GPS/GLONASS-based TEC measurements as a contributor for space weather forecast , 2002 .

[5]  R. G. Musgrove,et al.  Ionospheric convection associated with discrete levels of particle precipitation , 1986 .

[6]  L. Grunwaldt,et al.  GPS radio occultation measurements of the ionosphere from CHAMP: Early results , 2002 .

[7]  S. Schlüter,et al.  Differential Code Bias of GPS Receivers in Low Earth Orbit: An Assessment for CHAMP and SAC-C , 2005 .

[8]  Norbert Jakowski,et al.  Operational service for monitoring and evaluating the space weather impact on precise positioning applications of GNSS , 2004 .

[9]  Jens Wickert,et al.  A dynamically configurable system for operational processing of space weather data , 2001 .

[10]  N. Jakowski,et al.  Comparison of ionospheric radio occultation CHAMP data with IRI 2001 , 2005 .

[11]  Norbert Jakowski,et al.  Geomagnetic Storm Effects on the Topside Ionosphere and Plasmasphere: A Compact Tutorial and New Results , 2000 .

[12]  Norbert Jakowski,et al.  TEC Monitoring by Using Satellite Positioning Systems , 1996 .

[13]  C. Mitchell,et al.  Verification of CHAMP Radio-Occultation Observations in the Ionosphere Using MIDAS , 2003 .

[14]  S. Schlüter,et al.  Total electron content of the ionosphere during thegeomagnetic storm on 10 January 1997 , 1999 .

[15]  A. Belehaki,et al.  Validation of GPS Ionospheric Radio Occultation results onboard CHAMP by Vertical Sounding Observations in Europe , 2005 .

[16]  Norbert Jakowski,et al.  Comparison of high latitude electron density profiles obtained with the GPS radio occultation technique and EISCAT measurements , 2004 .

[17]  Stefan Heise,et al.  Sounding of the topside ionosphere/plasmasphere based on GPS measurements from CHAMP: Initial results , 2002 .

[18]  Larry J. Romans,et al.  Ionospheric electron density profiles obtained with the Global Positioning System: Results from the GPS/MET experiment , 1998 .

[19]  C. Reigber.  Earth Observation with CHAMP : Results from Three Years in Orbit , 2005 .

[20]  Dale N. Anderson,et al.  Parameterized ionospheric model: A global ionospheric parameterization based on first principles models , 1995 .