scholarly journals Anomalous Radio‐Wave Scattering from Interstellar Plasma Structures

2001 ◽  
Vol 549 (2) ◽  
pp. 997-1010 ◽  
Author(s):  
J. M. Cordes ◽  
T. Joseph W. Lazio
Keyword(s):  
Radio Wave ◽  
Wave Scattering ◽  
Interstellar Plasma

scholarly journals Speckles in Interstellar Radio-Wave Scattering

1991 ◽  
Vol 131 ◽  
pp. 238-241
Author(s):  
K. M. Desai ◽  
C. R. Gwinn ◽  
J. Reynolds ◽  
E. A. King ◽  
D. Jauncey ◽  
...  
Keyword(s):  
Radio Source ◽  
Radio Wave ◽  
Wave Scattering ◽  
Speckle Pattern ◽  
Complete Information ◽  
Radio Waves ◽  
Interstellar Plasma ◽  
Interstellar Scattering ◽  
Vela Pulsar ◽  
Scattering Material

AbstractObservations of speckles in the scattering disk of the Vela pulsar are presented and speckle techniques for studying and circumventing scattering of radio waves by the turbulent interstellar plasma are discussed. The speckle pattern contains, in a hologrammatic fashion, complete information on the structure of the radio source as well as the distribution of the scattering material. Speckle observations of interstellar scattering of radio waves are difficult because of their characteristically short timescales (≈seconds) and narrow bandwidths (≈kHz). Here, we present first observations, taken at 13 cm wavelength with elements of the SHEVE VLBI network, of speckles in interstellar scattering.

scholarly journals Studying Pulsar Emission Regions Using Interstellar Scattering

2001 ◽  
Vol 182 ◽  
pp. 65-70
Author(s):  
Carl R. Gwinn
Keyword(s):  
Radio Wave ◽  
Wave Scattering ◽  
Diffraction Limit ◽  
Pulsar Emission ◽  
The Past ◽  
Interstellar Plasma ◽  
Interstellar Scattering

AbstractRadio-wave scattering in the interstellar plasma provides the means to circumvent the diffraction limit for earth-based instruments, and to image the emission regions of pulsars. For the past 25 years, observers have sought to exploit this fact to learn how pulsars shine. I review the techniques developed, and summarize measurements of size of emission regions of pulsars to date.

scholarly journals Radio wave scattering in the outer heliosphere

2000 ◽  
Vol 105 (A3) ◽  
pp. 5149-5156 ◽  
Author(s):  
J. W. Armstrong ◽  
W. A. Coles ◽  
B. J. Rickett
Keyword(s):  
Radio Wave ◽  
Wave Scattering ◽  
Outer Heliosphere

scholarly journals Non‐Gaussian Radio‐Wave Scattering in the Interstellar Medium

2006 ◽  
Vol 640 (1) ◽  
pp. 344-352 ◽  
Author(s):  
Stanislav Boldyrev ◽  
Arieh Konigl
Keyword(s):  
Interstellar Medium ◽  
Radio Wave ◽  
Wave Scattering ◽  
Non Gaussian

scholarly journals The Galactic Distribution of Electron Density Microstructure Inferred from Radio Scattering Observations

2001 ◽  
Vol 182 ◽  
pp. 11-16
Author(s):  
James Cordes
Keyword(s):  
Interstellar Medium ◽  
Radio Wave ◽  
Electron Density ◽  
Wave Scattering ◽  
Galactic Model ◽  
Dispersion Measures ◽  
Pulse Broadening ◽  
Galactic Distribution

AbstractI first review the observables and optics of interstellar seeing associated with radio wave scattering in the interstellar medium. I then describe the Galactic distribution of electron density and its fluctuations, as inferred from a number of observables, including angular and pulse broadening, diffractive scintillations, and dispersion measures. Propects for improving the Galactic model are outlined.

scholarly journals Monitoring source variability with the Fast All Sky Telescope

1991 ◽  
Vol 131 ◽  
pp. 445-448
Author(s):  
Kenneth J. Johnston ◽  
Ralph L. Fiedler ◽  
Richard S. Simon
Keyword(s):  
Interstellar Medium ◽  
Radio Wave ◽  
Wave Scattering ◽  
Study Time ◽  
Time Variability ◽  
Radio Sources ◽  
Limited Sample ◽  
Extragalactic Radio Sources ◽  
Design Goal ◽  
Celestial Sphere

AbstractThe proposed Fast All Sky Telescope (FAST) is an interferometer which is intended to monitor the northern four-fifths of the celestial sphere every two days at 8.1 GHz and daily at 2.7 GHz. The design goal is to have a rms sensitivity of 10 mJy/beam at both frequencies. The array is planned to comprise 20 3-meter diameter antennas with a maximum baseline of 0.7 km. FAST will provide a valuable database that may be used to study time variability in a sensitivity limited sample of radio sources. This will significantly impact on the understanding of active Galactic and extragalactic radio sources, as well as on the understanding of radio wave scattering in the interstellar medium.

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