On the determination of ion temperature in the auroral F-region ionosphere

Details On the determination of ion temperature in the auroral F-region ionosphere On the determination of ion temperature in the auroral F-region ionosphere

Nov 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988p%26ss...36.1295l&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 36, Nov. 1988, p. 1295-1304.

Statistics

Computation

25

Auroral Zones, Eiscat Radar System (Europe), F Region, Ion Temperature, Ionospheric Ion Density, Geomagnetism, Line Of Sight, Monte Carlo Method, Velocity Distribution

Scientific paper

An assessment is made of the effect of the assumed form for the ion velocity distributon function on estimates of three-dimensional ion temperature from one-dimensional observations. Incoherent scatter observations by the EISCAT radar at a variety of aspect angles are used to demonstrate features of ion temperature determination and to study the ion velocity distribution function. One form of the distribution function which has recently been widely used in the interpretation of EISCAT measurements is found to be consistent with the data presented here, in that no deviation from a Maxwellian can be detected for observations along the magnetic field line and that the ion temperature and its anisotropy are accurately predicted. It is shown that theoretical predictions of the anisotropy by Monte Carlo computations are very accurate, the observed value being greater by only few percent. It is also demonstrated for the case studied that errors of up to 93 percent are introduced into the ion temperature estimate if the anisotropy is neglected.

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