Global sounding of sporadic E layers by the GPS/MET radio occultation experiment

Details Global sounding of sporadic E layers by the GPS/MET radio occultation experiment Global sounding of sporadic E layers by the GPS/MET radio occultation experiment

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001jastp..63.1973h&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 63, Issue 18, p. 1973-1980.

Physics

12

Scientific paper

The GPS radio occultation technique is sensitive for layered structures with horizontal scales of around 100km and with vertical scales of a few 100m or more at the Earth's limb. These structures cause strong fluctuations of the GPS L1 and L2 phase paths which have been measured by a GPS receiver onboard of Microlab-1 satellite in 730km orbit during the GPS/Meteorology experiment (GPS/MET of UCAR, Boulder). By means of GPS/MET radio occultation data, profiles of electron density fluctuations are derived for the mesosphere/lower thermosphere region with a height resolution of around 1km. Data analysis of 1900 radio occultation events in June/July 1995, 1540 events in October 1995, and 2690 events in February 1997 confirms seasonal dependence of sporadic E layers. The meridian slices of average sporadic E activity show a dominance of plasma irregularities in the summer hemisphere. The irregularities mainly occur at heights 90-110km. Auroral and equatorial sporadic E, electron density depletions, and multiple ionization layers are also present in the high resolution GPS/MET data. The multiple layers often have a distance of around 5-10km in height, and appear up to a height of 140km (upper height limit for 50Hz sampling rate of GPS receiver). For February and June, the GPS/MET observations are compared to ground-based observations of the Asia/Australia ionosonde chain.

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