Determining mid-Latitude O+/H+ Transition Altitudes From Topside Ionograms

Details Determining mid-Latitude O+/H+ Transition Altitudes From Topside Ionograms Determining mid-Latitude O+/H+ Transition Altitudes From Topside Ionograms

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmsa31b..08w&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SA31B-08

Physics

2431 Ionosphere/Magnetosphere Interactions (2736), 2437 Ionospheric Dynamics, 2443 Midlatitude Ionosphere, 2467 Plasma Temperature And Density, 2481 Topside Ionosphere

Scientific paper

The mid-latitude O+/H+ transition altitude (where the H+ and O+ number densities are equal) can be determined from ionospheric topside ionograms by fitting the electron-density (Ne) profiles to analytical H+ and O+ functions using the electron temperature Te, and the Te altitude gradient, at a base height of 400 km obtained from the Titheridge temperature model. This mid-latitude transition altitude is of importance because it is where the topside altitude distribution of the dominant ions transitions from the main ionosphere into the plasmasphere, where H+ is the dominant ion and magnetospheric-ionospheric interaction processes are important. This technique is applied to Alouette-1, ISIS-1 and ISIS-2 topside ionograms covering a variety of conditions such at local time, latitude, and solar storm conditions.

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