HF radar signatures of the cusp and low-latitude boundary layer

摘要: Continuous ground-based observations of ionospheric and magnetospheric regions are critical to the Geospace Environment Modeling (GEM) program. It is therefore important establish clear intercalibrations between different instruments satellites in order clearly place context with corresponding situ satellite measurements. HF-radars operating at high latitudes capable observing very large spatial ionosphere on a nearly continuous basis. In this paper we report an intercalibration study made using Polar Anglo-American Conjugate Radar Experiment radars located Goose Bay, Labrador, Halley Station, Antarctica, Defense Meteorological Satellite Program (DMSP) satellites. The DMSP data used provide identifications cusp low-latitude boundary layer (LLBL). radar for eight events LLBL have been examined determine signature these regions. This indicates that always characterized by wide, complex Doppler power spectra, whereas usually found spectra dominated single component. distribution spectral widths generally Gaussian form peak about 220 m/s. more like exponential distribution, occurring 50 There few cases where strikingly similar those observed cusp.