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Ann. Geophys., 22, 2015-2022, 2004
www.ann-geophys.net/22/2015/2004/
© European Geosciences Union 2004
Comparison of high latitude electron density profiles obtained with the GPS radio occultation technique and EISCAT measurements
C. Stolle1, N. Jakowski2, K. Schlegel3, and M. Rietveld3,4
1Institute for Meteorology, University of Leipzig, Stephanstr. 3, 04103 Leipzig, Germany
2Institute of Communications and Navigation, DLR Neustrelitz, Kalkhorstweg 53, 17235 Neustrelitz, Germany
3Max-Planck-Institut für Aeronomie, Max-Planck-Str. 2, 37191 Katlenburg-Lindau, Germany
4EISCAT, Ramfjordmoen, 9027 Ramfjordbotn, Norway
Abstract. To obtain a comprehensive view on high latitude processes by applying
different observation techniques, the SIRCUS campaign was initiated
in 2001/2002. This paper compares electron density profiles derived
from CHAMP radio occultation data and those measured with the EISCAT
facility. Since ionospheric profiling with the help of space-based
received GPS is a relatively new technique, validations with established
independent instruments are of crucial need. We present 28 profiling
events for quasi-statistical analyses, which occurred during the SIRCUS
campaigns and describe some of them in more detail. We found out that
the majority of profile comparisons in electron density peak value and
height, as well as in TEC, lie within the error ranges of the two methods.
Differences in the ionospheric quantities do not necessarily occur when
the locations of the occultation and of the radar site show considerable
distances. Differences are more pronounced when the ionosphere is remarkably
structured.
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