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fbtwitterlinkedinvimeoflicker grey 14rssslideshare1
Winser, K. J.; Lockwood, Mike; Jones, G. O. L. (1987)
Publisher: American Geophysical Union
Languages: English
Types: Article
Subjects:

Classified by OpenAIRE into

arxiv: Physics::Space Physics, Physics::Plasma Physics
Recent observations with the EISCAT incoherent scatter radar have shown large rises in dayside, auroral plasma velocities (>2 km s^{−1}) over a wide range of latitudes and lasting about an hour. These are larger than the neutral thermal speed, and allow, for the first time, observations of a non-thermal plasma over a range of observing angles, revealing a clear angular dependence. The observed ion temperature anisotropy, deduced by assuming a Maxwellian line-of-sight ion velocity distribution, is at least 1.75, which exceeds the theoretical value for a bi-Maxwellian based on a realistic ion-neutral collision model. The aspect angle dependence of the signal spectra also indicates non-Maxwellian plasma.
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    • Barakat, A.R., R.W.Schunk and J.-P. St-Maurice, Monte-Carlocalculations of the O+ velocity distributions in the auroral ionosphere, J. Ge0phys.Res., 88, 3237-3241, 1983.
    • Hubert, D., Non-Maxwellian velocity distribution functions and incoherent scattering of radar waves in the auroral ionosphere, J. Atmos. Terr. Phys., 46, 601-612, 1984.
    • Lockwood, M., B.J.I Bromage, R.B.Horne, J.-P. St-Maurice, D.M. Willis and S.W.H. Cowley, Non-Maxwellian ion velocity distributions observedusing EISCAT,Geoph.ysR.es. Lett., 111-114, 1987.
    • LoCkwOOd,M. and T.J. Fuller-Rowell, The modelled occurrence of non-thermal plasma in the ionospheric F-region and the possible consequences for ion outflows into the magnetosphereG,eophys.Res. Lett., 14, 371-374 and 581-582, 1987.
    • L•vhaug, U.P. and T. Fi•, Ion temperature anisotropy in the auroral F-region as measured with EISCAT,J. Atmos.Terr. Phys., 48, 959-971, 1986.
    • Moorcroft, D.R. and K. Schlegel, Evidence for non-Maxwellian velocity distributions in the F-region, J. Atmos.Terr. Phys.,in press, 1987.
    • Pertaut, S., A-•Brekke, M. Baron and D. Hubert, EISCAT measurementsof ion temperature which indicate non-isotropic ion velocity distributions, J. Atmos.Terr. Pllvs., 4__6, 531-544, 1984.
    • Raman,R.S.V., J.-P. St-Maurice and R.S.B. Ong, Incoherent scattering of radar waves in the auroral ionosphere,J. GeophysR.es., 86, 4751-4762• 1981.
    • St-Maurice, J.-P. and R.W. Schunk, Auroral ion velocity distributions for a polarization collision model, Planet. SpaceSci., 2_•5, 243-260, 1977.
    • St-Maurice, J. -P. and R.W. Schunk, Ion velocity distributions in the high latitude ionosphere, Rev. Geophys.and S..•ac.e Phys., 1_/7,99-134,1979. M. Lockwoodand K.J. Winset, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon.
    • 0Xll 0QX, UK. G.O.L. Jones, University College of Wales, Penglais, Aberystwyth, Dyfed SY23 3BZ, UK.
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