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| Titel |
Resurrection of a Unique Plasmapause Ion Composition Data Base |
| VerfasserIn |
V. Truhlík, J. M. Grebowsky, L. Trísková, D. Bilitza, R. Benson |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250022277
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| Zusammenfassung |
| Orbiting Geophysical Observatory 5 (OGO 5) magnetospheric ion-composition data (H+, He+ and O+) from an ion spectrometer [Sharp, IEE Trans. in Geosci. Elect. V, GE-7, 93, 1969] have been retrieved from old magnetic tapes archived at the National Space Science Data Center (NSSDC). The highly compressed binary format was converted into a user-friendly ASCII format and these data have now been made available from the NSSDC (http://nssdcftp.gsfc.nasa.gov). Using this data we have investigated the similarities and differences between the outer plasmasphere and plasmapause transition as seen in the H+, and He+ density gradients. The He+ plasmapause transition depicts a topology similar to recent IMAGE EUV observations whereas the H+ plasmapause characteristics are more in line with ground-based whistler observations. OGO 5 had a 31 degree inclination eccentric orbit of ~ 270 km x 148,000 km with ion spectrometer measurements available from the period March 2, 1968 to November 11, 1969. We will present the results of a comparison of the locations of the OGO-5 H+ and He+ plasmapause crossings. In addition, we will relate the magnetic-field-aligned projections of the plasmapause crossings to mid-latitude topside ionospheric electron-density altitude profiles from the International Satellites for Ionospheric Studies (Alouette 1 & 2 and ISIS 1) topside sounders, when and if such simultaneous data are available from the NSSDC. |
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