Results 251 to 260 of about 5,320 (271)

Ples model in the plasmapause diagnostics

Advances in Space Research, 2002
Abstract Code PLES instantaneous mapping of ionospheric characteristics though intended for operational use in telecommunication systems appears to be a useful tool in plasmapause diagnostics. PLES allows construction of retrospective maps for specific epochs.
I. Stanislawska, H. Rothkaehl
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Excitation of the Plasmapause at Ultralow Frequencies

Physical Review Letters, 1973
Observational evidence and the theoretical interpretation indicate that magnetic disturbances exterior to the plasmasphere boundary (within the magnetosphere) can excite damped, sinusoidal oscillations, which can be inferred as a magnetohydrodynamic surface eigenmode, at the o infer the plasma density inside the plasmapause and the plasma density ...
L. J. Lanzerotti, H. Fukunishi, A. Hasegawa, Liu Chen   +3 more
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The plasmapause as a VLF wave guide

Journal of Geophysical Research, 1977
The properties of the plasmapause as a VLF wave guide are studied. The guidance that occurs is a form of gradient trapping of VLF wave energy. It is shown that guiding is possible at both the inner and outer edges of the plasmapause and that more efficient guiding occurs as the plasmapause gradients become stronger.
U. S. Inan, T. F. Bell
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Observations of the plasmapause from OGO 5

Journal of Geophysical Research, 1970
Plasmapause observations by ion spectrometer aboard OGO-5 vehicle for early orbits, obtaining O, He and H ion concentration profiles for geomagnetic ...
K. K. Harris, G. W. Sharp, C. R. Chappell   +2 more
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Ballooning mode instability at the plasmapause

Journal of Geophysical Research: Space Physics, 1990
The ballooning mode instability, which can excite hydromagnetic waves at the plasmapause, is studied in the presence of azimuthal plasma flows induced during geomagnetically disturbed periods. A general sufficient criterion for the ballooning mode stability is derived as δW ≥ 0 (where δW represents the change in the potential energy) which involves the
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Observations of the plasmapause and diffuse aurora

Planetary and Space Science, 1976
Abstract Simultaneous auroral and whistler data from SANAE, Antarctica, show that the separation between the equatorward boundary of the diffuse aurora and the plasmapause lies between zero and 0.25 L . There is also some evidence to suggest that auroral precipitation occurs, at least partly, on closed field lines.
G.R. Linscott, M.W.J. Scourfield
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Plasmapause signatures in the ionosphere and magnetosphere

Journal of Geophysical Research: Space Physics, 1978
Isis 2 observations of a variety of topside ionospheric ‘signatures’ of the plasmapause are compared with simultaneously acquired equatorial electron density profiles obtained by the whistler technique. The satellite data were acquired at ∼1400‐km altitude at dusk and dawn in the sunlit northern hemisphere summer ionosphere within ∼15° longitude of the
J. C. Foster, C. G. Park, L. H. Brace, J. R. Burrows, J. H. Hoffman, E. J. Maier, J. H. Whitteker   +6 more
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Recent Research on the Magnetospheric Plasmapause

Radio Science, 1968
The plasmapause is a three‐dimensional field aligned boundary that divides the closed field‐line portion of the earth's magnetosphere into two physically distinct regions. The boundary is asymmetric, usually exhibiting a minimum geocentric range near dawn and a maximum near dusk under conditions of moderate but steady geomagnetic agitation (Kp = 2 − 4).
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Evidence of drift waves at the plasmapause

Journal of Geophysical Research: Space Physics, 1978
As the Hawkeye 1 spacecraft crosses the plasmapause at high altitudes (R > 3 RE), a band of electric field noise is often detected in the frequency channels from 1.7 to 178 Hz. No corresponding magnetic field noise is detected, indicating that the noise is electrostatic (or at least quasi‐electrostatic), and the electric field is polarized ...
Paul M. Kintner, Donald A. Gurnett
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Plasmapause effects in the top side ionosphere

Journal of Geophysical Research, 1976
Values of plasma temperature and O+/H+ ion transition height, obtained from 60,000 Alouette 1 electron density profiles, are used to study changes associated with the plasmapause. An ionospheric plasmapause can be defined by (1) the latitude at which peak temperatures occur, (2) the latitude down to which the ion transition height remains high, showing
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