Results 181 to 190 of about 3,881 (215)

Heliospheric tomography using interplanetary scintillation observations

Advances in Space Research, 1997
Abstract We have produced a Computer Assisted Tomography (CAT) program that optimizes a three dimensional solar wind velocity, V, and density fluctuation, ΔNe, model to fit observed interplanetary scintillation (IPS) data from Nagoya, Japan and Cambridge, England. The multiple perspective views of the solar wind needed for the reconstruction solution
B.V. Jackson, P.L. Hick, M. Kojima, A. Yokobe   +3 more
openaire   +1 more source

Scintillators on Interplanetary Space Missions

IEEE Transactions on Nuclear Science, 2008
Lanthanum halide scintillators are currently being assessed by ESA for use as remote sensing gamma-ray spectrometers on future planetary missions. Such missions place a raft of constraints and requirements on sensor technology, which invariably stem from environmental and resource issues.
openaire   +1 more source

Analysis of three-station interplanetary scintillation

Journal of Geophysical Research, 1972
Statistical models used in the analysis of drifting random patterns are discussed. A new method of estimating the drift velocity with minimal a priori assumptions is presented. It is shown that all the models which allow for pattern rearrangement, including the new method, can be highly sensitive to systematic errors.
J. W. Armstrong, W. A. Coles
openaire   +1 more source

Bessellian Spectral Analysis of Interplanetary Scintillation

Publications of the Astronomical Society of Australia, 1972
It is now well established that observations of interplanetary scintillation from a single station can yield useful information on the angular structure of radio sources, and on the propagation of large-scale disturbances through the interplanetary medium.
B. D. Ward, R. G. Blesing, P. A. Dennison   +2 more
openaire   +1 more source

Cosmic ray scintillations: 2. General theory of interplanetary scintillations

Journal of Geophysical Research, 1974
The motion of charged particles in a stochastic magnetic field with nonzero mean is considered via a generalized quasi-linear expansion of Liouville's equation. The general result is an equation relating cosmic ray scintillations to magnetic fluctuations and to cosmic ray gradients.
openaire   +1 more source

Interplanetary Scintillation and Flare — Produced Disturbances

Publications of the Astronomical Society of Australia, 1975
Determination of the large-scale structure of flare-produced disturbances requires either multiple spacecraft observations or an ensemble averaging of single spacecraft observations of a number of events. There is currently some confusion in the results of studies of shock normals derived from spacecraft data.
openaire   +1 more source

Velocity fluctuations in the interplanetary scintillation pattern

Journal of Geophysical Research: Space Physics, 2000
The skewness of the temporal cross‐correlation function of radio scintillation observed simultaneously at spaced antennas is considered as characteristic of random motions in the turbulent solar wind. The results of the skewness measurements using radio telescopes of Solar‐Terrestrial Environment Laboratory at 327 MHZ and European Incoherent Scatter ...
I. V. Chashei, V. I. Shishov, M. Kojima, H. Misawa   +3 more
openaire   +1 more source

Interplanetary Scintillation in Jupiter’s Decametric Radiation

Publications of the Astronomical Society of Japan, 1981
Abstract The intensity fluctuations of the 21.860-MHz radio em1ss10n from Jupiter are analyzed to investigate the characteristics of the plasma irregularities in the solar wind. Observations were made during the periods, July 1976–March 1977 and October 1977–March 1978.
openaire   +1 more source

Interplanetary shock waves from radio scintillation data

Physics and Chemistry of the Earth, Part C: Solar, Terrestrial & Planetary Science, 2000
Abstract The structure and evolution of the interplanetary shock waves are obtained by scintillation observations of the large number of radio-sources. Typical angle size of shock front is about 40° – 60° on heliolatitude and heliolongitude. The dependence of scintillation index m on a distance from shock front surface Δr can be represented by a ...
V.I. Shishov, V.I. Vlasov, I.V. Chashei
openaire   +1 more source

Turbulence and Scintillations in the Interplanetary Plasma

Annual Review of Astronomy and Astrophysics, 1973
The properties of the broadband fluctuations of the interplanetary plasma are discussed, taking into account observations in the vicinity of 1 AU heliocentric radius on space probes. Aspects of interplanetary scintillations and angular broadening as a probe of the solar wind are considered, giving attention to the 'thin-screen' approximation, a three ...
openaire   +1 more source