Derivation and test of ionospheric activity indices from real-time ionosonde observations in the European region

Details Derivation and test of ionospheric activity indices from real-time ionosonde observations in the European region Derivation and test of ionospheric activity indices from real-time ionosonde observations in the European region

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006jastp..68.2075b&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 68, Issue 18, p. 2075-2090.

Physics

6

Scientific paper

New ionospheric activity indices are derived from automatically scaled online data from several European ionosonde stations. These indices are used to distinguish between normal ionospheric conditions expected from prevailing solar activity and ionospheric disturbances caused by specific solar and atmospheric events (flares, coronal mass ejections, atmospheric waves, etc.). The most reliable indices are derived from the maximum electron density of the ionospheric F 2-layer expressed by the maximum critical frequency foF 2. Similar indices derived from ionospheric M(3000)F 2 values show a markedly lower variability indicating that the changes of the altitude of the F 2-layer maximum are proportionally smaller than those estimated from the maximum electron density in the F 2-layer. By using the ionospheric activity indices for several stations the ionospheric disturbance level over a substantial part of Europe (34°N 60°N; 5°W 40°E) can now be displayed online.

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