Radio Science

  1. Research Articles

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    2. Research Articles
    1. Occurrence of equatorial spread F during intense geomagnetic storms (pages 563–573)

      S. Ray, B. Roy and A. Das

      Version of Record online: 2 JUL 2015 | DOI: 10.1002/2014RS005422

      Key Points

      • Geomagnetic storms during 1996–2005 are ordered in terms of Dst and IMF Bz
      • Effects of PPE during intense storms are studied from global ion density plots
      • Longitudes of occurrence of ESF in response to PPE are predicted from IMF Bz
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      Methodology of evaluating the science benefit of various satellite/sensor constellation orbital parameters to an assimilative data forecast model (pages 318–326)

      Richard L. Balthazor, Matthew G. McHarg, C. Lon Enloe, Brandon Mueller, David J. Barnhart, Zachary W. Hoeffner, Robert Brown, Ludger Scherliess and Lance T. Wilhelm

      Version of Record online: 17 APR 2015 | DOI: 10.1002/2014RS005426

      Key Points

      • Methodology for evaluating benefit of increasing assimilative data sources
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      Strong scintillation of GNSS signals in the inhomogeneous ionosphere: 2. Simulator of transionospheric channel (pages 168–176)

      Vadim E. Gherm and Nikolay N. Zernov

      Version of Record online: 25 FEB 2015 | DOI: 10.1002/2014RS005604

      Key Points

      • The physics based software simulator of the GNSS signals is presented
      • Simulator produces the field time series in the case of strong scintillation
      • Scintillation index is obtained from propagation model
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      Strong scintillation of GNSS signals in the inhomogeneous ionosphere: 1. Theoretical background (pages 153–167)

      Nikolay N. Zernov and Vadim E. Gherm

      Version of Record online: 25 FEB 2015 | DOI: 10.1002/2014RS005603

      Key Points

      • Analytical description of the strong scintillation in inhomogeneous ionosphere
      • Intensity scintillation index is obtained from propagation model
      • The theory is applied for constructing the software simulator
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      Ionospheric tomography in Bayesian framework with Gaussian Markov random field priors (pages 138–152)

      J. Norberg, L. Roininen, J. Vierinen, O. Amm, D. McKay-Bukowski and M. Lehtinen

      Version of Record online: 18 FEB 2015 | DOI: 10.1002/2014RS005431

      Key Points

      • We present a novel ionospheric tomography reconstruction method
      • The method is based on Bayesian inference with the use of GMRF priors
      • The prior distribution is built based on physical and empirical information
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      Observed high-latitude GNSS disturbances during a less-than-minor geomagnetic storm (pages 1277–1288)

      Y. L. Andalsvik and K. S. Jacobsen

      Version of Record online: 26 DEC 2014 | DOI: 10.1002/2014RS005418

      Key Points

      • Small space weather events can have a large local impact at high latitudes
      • At high latitudes, warnings based on global indices are not as suitable
      • The effects are amplified for users of a service with no receivers nearby
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      Magnetic storm effects on the variation of TEC over Ilorin an equatorial station (pages 1245–1253)

      J. O. Adeniyi, P. H. Doherty, O. A. Oladipo and O. Bolaji

      Version of Record online: 19 DEC 2014 | DOI: 10.1002/2014RS005404

      Key Points

      • Magnetic storms cause TEC to increase most of the time at equatorial region
      • Maximum TECs on quiet days occur after midday
      • Solar activity effect may offset normal seasonal effect
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      Beacon satellite receiver for ionospheric tomography (pages 1141–1152)

      J. Vierinen, J. Norberg, M. S. Lehtinen, O. Amm, L. Roininen, A. Väänänen, P. J. Erickson and D. McKay-Bukowski

      Version of Record online: 1 DEC 2014 | DOI: 10.1002/2014RS005434

      Key Points

      • New low-cost beacon satellite receiver
      • Measurement equations and error terms for ionospheric tomography
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      Comparison of four methods for transionospheric scintillation evaluation (pages 899–909)

      Hal J. Strangeways, Nikolay N. Zernov and Vadim E. Gherm

      Version of Record online: 13 OCT 2014 | DOI: 10.1002/2014RS005408

      Key Points

      • Comparison of four different methods of determining transionospheric scintillation
      • Variation of scintillation with irregularity parameters and propagation geometry
      • Effect of different approximations on accuracy of scintillation determination
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      Effects of transionospheric signal decorrelation on Global Navigation Satellite Systems (GNSS) performance studied from irregularity dynamics around the northern crest of the EIA (pages 851–860)

      T. Das, B. Roy and A. Paul

      Version of Record online: 6 OCT 2014 | DOI: 10.1002/2014RS005406

      Key Points

      • Irregularity dynamical information derived from VHF spaced aerial measurements
      • Proxy indicators of GNSS performance degradation
      • Prediction of GPS L band S4
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      Kriging method to perform scintillation maps based on measurement and GISM model (pages 746–752)

      Pierrick Hamel, Diagna Charles Sambou, Muriel Darces, Yannick Beniguel and Marc Hélier

      Version of Record online: 12 SEP 2014 | DOI: 10.1002/2014RS005470

      Key Points

      • Kriging algorithm to interpolate data
      • Scintillation map generation
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      Observation of the ionospheric irregularities over the Northern Hemisphere: Methodology and service (pages 653–662)

      Iurii Cherniak, Andrzej Krankowski and Irina Zakharenkova

      Version of Record online: 21 AUG 2014 | DOI: 10.1002/2014RS005433

      Key Points

      • Daily ROTI maps created on base of observations of about 700 GNSS stations
      • ROTI maps allow to estimate overall fluctuation activity evolutions
      • Ionospheric irregularities are driving forces of space weather phenomena
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      Predictions of HF system performance for propagation through disturbed ionospheres measured using low-Earth-orbit satellite radio beacon tomography (pages 506–517)

      Paul A. Bernhardt, Matthew A. Hei, Carl L. Siefring and Matthew R. Wilkens

      Version of Record online: 17 JUL 2014 | DOI: 10.1002/2014RS005409

      Key Points

      • Radio beacon tomography
      • HF ray tracing through the reconstructions
      • Experimental verification
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      North-south components of the annual asymmetry in the ionosphere (pages 485–496)

      T. L. Gulyaeva, F. Arikan, M. Hernandez-Pajares and I. S. Veselovsky

      Version of Record online: 10 JUL 2014 | DOI: 10.1002/2014RS005401

      Key Points

      • The South hemisphere has larger NmF2, IEC, half GEC, and TEC than the North
      • Ionosphere has denser plasma over sea than land that generates a tilt
      • Larger number of earthquakes in the South may be a major contributor of NSA