Results 21 to 30 of about 6,025 (156)

Interstellar Scintillation and Clouds of the Interstellar Turbulent Plasma [PDF]

International Astronomical Union Colloquium, 2001
AbstractData on interstellar diffraction and refraction scintillation of pulsars are analyzed. Comparison between theory and the observational data shows that two types of spectra for electron density fluctuations are realized in the interstellar medium: pure power law and piecewise with a break. The distribution of turbulent plasma in the Galaxy has a
openaire   +2 more sources

INVESTIGATION OF THE IONIZED COMPONENT OF THE LOCAL INTERSTELLAR MEDIUM

Odessa Astronomical Publications, 2017
Based upon numerous observational data of variability in extragalactic radiosources of the southern sky at low frequences the possibility of obtaining information on ionized component structure in the Local Interstellar Medium (LISM) is investigate.
N. G. Bochkarev, M. I. Ryabov, E. A. Isaeva   +2 more
doaj   +1 more source

Small-Scale Variations of HI Spectra from Interstellar Scintillatio [PDF]

, 2001
I suggest that radio-wave scattering by the interstellar plasma, in combination with subsonic gradients in the Doppler velocity of interstellar HI, is responsible for the observed small-scale variation in HI absorption spectra of pulsars.
C. R. Gwinn, Davis R. J., Deshpande A. A., Goodman J., Mebold U., Narayan R.   +5 more
core   +3 more sources

Simulation of optical interstellar scintillation [PDF]

Astronomy & Astrophysics, 2013
Stars twinkle because their light propagates through the atmosphere. The same phenomenon is expected on a longer time scale when the light of remote stars crosses an interstellar turbulent molecular cloud, but it has never been observed at optical wavelengths.
Habibi, F., Moniez, M., Ansari, R., Rahvar, S.   +3 more
openaire   +3 more sources

INTERSTELLAR SCINTILLATION OF THE DOUBLE PULSAR J0737–3039 [PDF]

The Astrophysical Journal, 2014
We report here a series of observations of the interstellar scintillation (ISS) of the double pulsar J0737$-$3039 over the course of 18 months. As in earlier work (Coles et al., 2005) the basic phenomenon is the variation in the ISS caused by the changing transverse velocities of each pulsar, the ionized interstellar medium (IISM), and the Earth.
B. J. Rickett, W. A. Coles, C. F. Nava, M. A. McLaughlin, S. M. Ransom, F. Camilo, R. D. Ferdman, P. C. C. Freire, M. Kramer, A. G. Lyne, I. H. Stairs   +10 more
openaire   +4 more sources

Pulsar Scintillation and the Local Bubble [PDF]

, 1998
We present here the results from an extensive scintillation study of twenty pulsars in the dispersion measure (DM) range 3 - 35 pc cm^-3 caried out using the Ooty Radio Telescope (ORT) at 327 MHz, to investigate the distribution of ionized material in ...
Bhat, N. D. Ramesh, Gupta, Yashwant, Rao, A. Pramesh   +2 more
core   +2 more sources

Interstellar Scintillation of Pulsar B0809+74 [PDF]

The Astrophysical Journal, 2000
Weak interstellar scintillations of pulsar B0809+74 were observed at two epochs using a 30m EISCAT antenna at 933 MHz. These have been used to constrain the spectrum, the distribution and the transverse velocity of the scattering plasma with respect to the local standard of rest (LSR).
Rickett, Barney, Coles, Bill, Markkanen, Jussi   +2 more
openaire   +2 more sources

Scattering and Diffraction in Magnetospheres of Fast Pulsars [PDF]

, 1999
We apply a theory of wave propagation through a turbulent medium to the scattering of radio waves in pulsar magnetospheres. We find that under conditions of strong density modulation the effects of magnetospheric scintillations in diffractive and ...
Anuj Parikh, Blandford R., Gupta Y., Hankins T. H., Kramer M., Maxim Lyutikov, Melrose D. B., Smirnova T. V., Sutton J. M.   +8 more
core   +3 more sources

Search for Turbulent Gas through Interstellar Scintillation [PDF]

Proceedings of the International Astronomical Union, 2011
AbstractStars twinkle because their light propagates through the atmosphere. The same phenomenon is expected when the light of remote stars crosses a Galactic—disk or halo—refractive medium such as a molecular cloud. We present the promising results of a test performed with the ESO–NTT, and consider its potential.
Moniez, Marc, Ansari, R., Habibi, F., Rahvar, S.   +3 more
openaire   +3 more sources

Interstellar Scintillation of PSR J2048−1616

The Astrophysical Journal, 2022
Abstract We report on the interstellar scintillation from pulsar J2048−1616 for the first time at 732, 1369, and 3100 MHz observed with the Parkes 64 m radio telescope. Dynamic spectra are obtained and diffractive parameters are derived from two-dimensional autocorrelation analyses.
J. L. Chen, Z. G. Wen, J. P. Yuan, Z. Wang, N. Wang, W. M. Yan, R. Yuen, H. G. Wang, J. P. Wang, K. Zhao, B. B. Xiang, D. L. He, X. F. Duan   +12 more
openaire   +1 more source