Open Access

Regional ionosphere map over Japanese Islands

  • J. Ping1Email author,
  • Y. Kono1,
  • K. Matsumoto1,
  • Y. Otsuka2,
  • A. Saito3,
  • C. Shum4,
  • K. Heki1 and
  • N. Kawano1
Earth, Planets and Space201454:BF03352450

https://doi.org/10.1186/BF03352450

Received: 13 September 2002

Accepted: 12 December 2002

Published: 21 June 2014

Abstract

Based on the high time and spatial resolution total electron content (TEC) data, which is estimated from the phase and code observables obtained by using GPS (Global Positioning System) Earth Observation Network (GEONET), the TEC distribution and its time variation over Japanese Islands are scaled into 0.5° × 0.5° grid data for each 10 minutes. The TEC daily map time series are arranged in an array to show the TEC evolution. Based on the spherical harmonics expansion of global ionospheric TEC model (GIM), which is estimated from global GPS observation, the TEC maps are expanded firstly through as high as 60 degrees and orders for a spherical harmonic function as a regional ionosphere map (RIM). The evolution history of medium scale traveling ionospheric disturbances (MSTIDs), i.e. polarward intense TEC enhancement and pre-noon rapid irregular fluctuations near the geomagnetic equator, are identified and confirmed in a quiet geomagnetic period.