The three-dimensional Raman's distribution as a non-Maxwellian model and the ionospheric ion outflows into the magnetosphere revisited

Journal Article · Mon Jul 01 04:00:00 EDT 1991 · Journal of Geophysical Research; (United States)

DOI:https://doi.org/10.1029/91JA00309· OSTI ID:5256947

Hubert, D; Kinzelin, E ^[1]

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1. Observatoire de Paris, Meudon (France)

The three-dimensional Raman's distribution as a model for fitting non-Maxwellian distributions, and the consequences for the hydrodynamic mirror force due to coupling between pressure anisotropy and the inhomogeneous geomagnetic field are revisited. The authors demonstrate that the three-dimensional Raman's model is unable to quantitatively predict the Post-Rosenbluth or ion cyclotron instability threshold. The application of this model to deduce ion temperature anisotropy from only one radar spectra measurement is shown to be restricted to specific aspect angles and small electric field intensities. This model provides the line-of-sight temperature and then the thermodynamical temperature for aspect angle equal to 54.7 {degree}. The hydrodynamic upwelling force is shown to be greatly affected by the ion-neutral interaction process. This additional force represents an important amount of the gravity in the presence of large electric fields. The upwelling force is overestimated to a great extent, when using the three-dimensional Raman's model to fit non-Maxwellian distribution functions observed in the auroral ionosphere.

• OSTI ID: 5256947
• Journal Information: Journal of Geophysical Research; (United States), Journal Name: Journal of Geophysical Research; (United States) Vol. 96:A7; ISSN 0148-0227; ISSN JGREA
• Country of Publication: United States
• Language: English

Related Subjects

640201* -- Atmospheric Physics-- Auroral
Ionospheric
& Magetospheric Phenomena
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ANISOTROPY
EARTH ATMOSPHERE
EARTH MAGNETOSPHERE
ELECTRIC FIELDS
GEOMAGNETIC FIELD
INSTABILITY
ION DRIFT
ION TEMPERATURE
IONOSPHERE
MAGNETIC FIELDS
MASS TRANSFER
MATHEMATICAL MODELS
MEASURING INSTRUMENTS
PLANETARY IONOSPHERES
PLASMA INSTABILITY
RADAR
RANGE FINDERS
THREE-DIMENSIONAL CALCULATIONS