Volume 59, Number 4, August 2002
|Page(s)||626 - 632|
|Section||Geophysics, astronomy, and astrophysics|
|Published online||01 August 2002|
Global ionospheric -layer height monitoring
Institut für Meteorologie und Geophysik
- Feldberg straße 47 D-60323 Frankfurt am Main, Germany
2 STAR Laboratory - Stanford University, Stanford, CA 94305, USA
3 Max-Planck Institut für Aeronomie - Max-Planck Straße 2 D-37191 Katlenburg-Lindau, Germany
Accepted: 27 May 2002
A global two-scale height ionospheric conductivity profile is inferred from the mean electromagnetic-wave propagation velocities of seven Earth-ionosphere cavity resonances in the frequency range . The time-varying reflection height for the electromagneticwaves is monitored on a diurnal basis. This D-layer height exhibits an increase at solar quiet conditions associated with decreased ionisation at mesospheric altitudes from solar short-wave radiation during the solar cycle and the solar rotation period. It is concluded that it is possible to monitor the global ionospheric D-layer heightvariability with naturally occurring electromagnetic waves in the atmosphere. A small network of magnetometers may detect and locate large-scale remote areas of mesospheric conductivity profile perturbations from short-lived extraterrestrial ionisation sources in the South Atlantic geomagnetic field anomaly, which are an appreciated hazard to spacecraft operation.
PACS: 94.20.Ee – D region / 52.35.Hr – Electromagnetic waves (e.g., electron-cyclotron, Whistler, Bernstein, upper hybrid, lower hybrid) / 41.20.Jb – Electromagnetic wave propagation; radiowave propagation
© EDP Sciences, 2002
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