Relating OGO-5 H+ Plasmapause Transitions to Mid-Latitude Topside-Ionospheric Signatures

Details Relating OGO-5 H+ Plasmapause Transitions to Mid-Latitude Topside-Ionospheric Signatures Relating OGO-5 H+ Plasmapause Transitions to Mid-Latitude Topside-Ionospheric Signatures

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsa33a1436t&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SA33A-1436

Physics

[2443] Ionosphere / Midlatitude Ionosphere, [2481] Ionosphere / Topside Ionosphere, [2724] Magnetospheric Physics / Magnetopause And Boundary Layers, [2736] Magnetospheric Physics / Magnetosphere/Ionosphere Interactions

Scientific paper

Plasmapause transitions, as seen in the H+ and He+ density gradients measured by the Orbiting Geophysical Observatory 5 (OGO 5) ion spectrometer [Sharp, IEE Trans. in Geosci. Elect., 1969], have been investigated in an attempt to relate them to their topside ionospheric signatures as seen in the Alouette-1 & 2 and ISIS-1 data. The satellite data were obtained from the National Space Science Data Center (NSSDC). A search of the OGO-5 data revealed 54 sharp plasmapause crossings as evaluated from the H+ density. The ionospheric footprints (at 1400 km altitude) of the magnetic-field lines through the locations of these plasmapause crossings were then used to search for topside ionospheric electron-density profiles from the NSSDC. No profiles corresponding to these projections were identified. A similar search of the topside-sounder 35-mm ionogram-film database, however, identified 17 cases of candidate "conjunctions" involving Alouette1 & 2 and ISIS 1. We will present samples of the plasmapause OGO-5 ion transitions and the related topside ionospheric signatures and discuss the observations in relation to the recent similar study based on Explorer-45 and ISIS-2 data [Grebowsky et al., JASTP, 2009].

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