摘要：The electron density profiles retrieved from the COSMIC radio occultation measurements were examined in order to estimate the possibility of its use as additional data source to study changes in electron density distribution occurred during ionospheric storms.The ionosphere behaviour during moderate geomagnetic storm which occurred on October 11, 2008 was analysed.The short-duration positive effect was revealed distinctly in GPS TEC and ionosonde measurements.For the European mid-latitude region it reached the factor of 2 or more relative to the undisturbed conditions.COSMIC data were analyzed and their validity was tested by comparison with ground-based measurements.It was shown the good agreement between independent measurements both in quiet and disturbed conditions.Analysis of COSMIC-derived electron density profiles revealed changes of the bottom-side and topside parts of the ionosphere.
