Modelling the undisturbed high-latitude E region

Details Modelling the undisturbed high-latitude E region Modelling the undisturbed high-latitude E region

Aug 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992adspr..12..329k&link_type=abstract

Advances in Space Research (ISSN 0273-1177), vol. 12, no. 6, 1992, p. 329-332. Research supported by NFR.

Computer Science

E Region, Eiscat Radar System (Europe), Electron Density Profiles, Incoherent Scatter Radar, Solar Activity, Aeronomy, Atmospheric Models, Extreme Ultraviolet Radiation

Scientific paper

Electron density profiles measured by the Eiscat incoherent scatter radar are used to determine the undisturbed behavior of the E region at 69.6 deg N, 19.2 deg E. Results are presented showing the solar zenith dependence for both low (F10.7 less than 80) and high (F10.7 greater than 180) solar activity levels. The results are compared with aeronomical calculations based on the MSIS86 neutral atmosphere model and measurements of solar EUV fluxes, and with the International Reference Ionosphere. Fairly good agreement is found between IRI and the measurements for solar zenith angles less than 80 deg. The aeronomical calculations show good agreement with the measurements of the bottomside and peak of the E region also for solar zenith angles less than 80 deg. For zenith angles from 85 to 90 deg neither model gives a good representation of the true electron density profile, particularly in winter when a strong, narrow layer peaking at about 100 km altitude is observed. A pronounced valley above the E region peak is predicted by the aeronomical calculations at all solar zenith angles but is not observed.

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