Results 171 to 180 of about 3,881 (215)

Spectra of interplanetary scintillation

Nature, 1980
A new type of radio spectrograph is described here which has been used to observe the interplanetary scintillation of a radio source over a two-to-one frequency range. Simultaneous observations over this range provide a direct insight into the time variations of intensity and the physical form of the interplanetary irregularities producing them.
T. W. Cole, O. B. Slee
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MHD tomography using interplanetary scintillation measurement

Journal of Geophysical Research: Space Physics, 2003
The MHD tomography analysis, an advanced version of the computer‐assisted tomography (CAT) analysis for interplanetary scintillation (IPS) observational data, is presented. When combined with a MHD simulation, the CAT analysis can reconstruct the MHD‐based three‐dimensional solar wind structure within 1 AU from the IPS line‐of‐sight integrated velocity
Keiji Hayashi, Masayoshi Kojima, Munetoshi Tokumaru, Ken'ichi Fujiki   +3 more
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Dynamic spectra of interplanetary scintillations

Nature, 1984
Interplanetary scintillations (IPS) are fluctuations in the apparent intensity of radio sources caused by fluctuations in the electron density of the solar wind1. Observations at a single wavelength provide information on the spatial spectrum of electron density at scales of the order of the radius of the first Fresnel zone.
W. A. Coles, J. P. Filice
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Interplanetary Scintillation of Small Diameter Radio Sources

Nature, 1964
A. HEWISH, P. F. SCOTT, D. WILLS
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EISCAT measurements of interplanetary scintillation

Journal of Atmospheric and Terrestrial Physics, 1996
Abstract EISCAT has been used to make three types of measurement of the characteristics of the solar wind in the range 10–120 solar radii. The rms fluctuation in the total power received from a single source can be measured to provide a `scintillation index'. The cross-correlation of the scintillations observed at two sites can be used to measure the
A.R. Breen, W.A. Coles, R. Grall, U.-P. Levhaug, J. Markkanen, H. Misawas, P.J.S. Williams   +6 more
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Dispersion analysis of interplanetary scintillation

Planetary and Space Science, 1970
Abstract By the application of dispersion analysis to records of interplanetary scintillation taken from a triangular arrangement of receivers, it is found that the velocity of drift of the diffraction pattern increases with temporal frequency of different Fourier components of the pattern.
Malcolm G. Golley, Paul A. Dennison
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Travelling interplanetary disturbances detected using interplanetary scintillation at 327 MHz

Solar Physics, 1996
Based on the advance predictions of two flare-generated shock fronts, obtained from the Space Environment Centre (SEC, NOAA, Boulder), observations of interplanetary scintillation (IPS) were carried out with the Ooty Radio Telescope (ORT) on a grid of appropriately located sources during the period 31 October to 5 November, 1992.
P. Janardhan, V. Balasubramanian, S. Ananthakrishnan, M. Dryer, A. Bhatnagar, P. S. McIntosh   +5 more
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On the interplanetary cosmic-ray scintillations

Astrophysics and Space Science, 1977
The equation for the two-particles cosmic-ray distribution function is derived by means of the Boltzmann kinetic equation averaging. This equation is valid for arbitrary ratio of regular and random parts of the magnetic field. For small energy particles the guiding-center approximation is used.
I. N. Toptygin, V. N. Vasilijev
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Radio-scintillation observations of interplanetary disturbances

Advances in Space Research, 1984
Abstract Recent developments in the studies of interplanetary disturbances by scintillation (IPS) techniques are briefly reviewed. The turbulent post-shock region of an interplanetary disturbance produces transient enhancements in the scintillation level and the flow speed in many cases.
Takashi Watanabe, Takakiyo Kakinuma
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Interplanetary scintillation and plasma density

Planetary and Space Science, 1986
Abstract Observations on a grid of 900–2500 radio sources have been combined with in situ spacecraft measurements to determine the relation between interplanetary scintillation and mean plasma-densily along the line of sight. Studies carried out during a variety of disturbances, including shocks and corotating streams, indicate a relation g ≅ (N/9)0 ...
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