Ion transport in the mid-latitude F1-region

Details Ion transport in the mid-latitude F1-region Ion transport in the mid-latitude F1-region

Jun 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983p%26ss...31..671f&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 31, June 1983, p. 671-687.

Physics

5

F 1 Region, Ionospheric Electron Density, Midlatitude Atmosphere, Atmospheric Circulation, Daytime, Incoherent Scatter Radar, Solar Activity Effects, Solar Cycles, Wind Velocity

Scientific paper

Taieb et al. (1975) have analyzed data gathered by the French multistatic incoherent scatter radar facility at St. Santin during the period 1967-1972 in the altitude range from 120 to 200 km. They have found that the electron concentration increases as a function of altitude up to a maximum value at a certain altitude and then decreases to a minimum value at a higher altitude before increasing monotonically towards the normal F2 peak value. It is also found that this 'valley' appears just after sunrise and disappears just before sunset. The 'daytime valley' in the F1 region is present only from March to September. The present investigation is concerned with the importance of plasma motions in the daytime mid-latitude F1-region, taking into account the measurements made at St. Santin. Through simultaneous solutions of the coupled continuity and momentum equations for the O(+), O2(+), NO(+), and N2(+) ions it is demonstrated that an F1-valley in the daytime electron concentration altitude profile can be produced by two mechanisms.

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