Comparison of COSMIC radio occultation Eelectron density measurements over Europe with ionosonde and incoherent scatter radar data

The COSMIC/FORMOSAT-3 occultation mission providing essential information about height electron density distribution in ionosphere. It is important to verify occultation profiles with other techniques and to obtain experience in the reliability of their derivation. For comparison we used the measurements provided by DIAS ionosonde network and midlatitude Kharkov incoherent scatter radar. The comparison indicates that usually COSMIC RO profiles are in a good agreement with ionosonde in F2 layer peak electron density and with IS radars profiles both in the F2 layer peak electron density and the shape of profiles.