Results 41 to 50 of about 79,833 (199)

Asymmetry function of interstellar scintillations of pulsars

Astronomy Reports, 2005
A new method for separating intensity variations of a source's radio emission having various physical natures is proposed. The method is based on a joint analysis of the structure function of the intensity variations and the asymmetry function, which is a generalization of the asymmetry coefficient and characterizes the asymmetry of the distribution ...
Shishov, V. I., Smirnova, T. V.
openaire   +2 more sources

Scintillations and Levy Flights through the Interstellar Medium [PDF]

The Astrophysical Journal, 2003
Temporal broadening of pulsar signals results from electron density fluctuations in the interstellar medium that cause the radiation to travel along paths of different lengths. The Gaussian theory of fluctuations predicts that the pulse temporal broadening should scale with the wavelength as lambda^4, and with the dispersion measure (corresponding to ...
Boldyrev, Stanislav, Gwinn, Carl
openaire   +2 more sources

Interstellar scintillation observations for PSR B0355+54 [PDF]

Monthly Notices of the Royal Astronomical Society, 2018
In this paper, we report our investigation of pulsar scintillation phenomena by monitoring PSR B0355$+$54 at 2.25 GHz for three successive months using \emph{Kunming 40-m radio telescope}. We have measured the dynamic spectrum, the two-dimensional correlation function, and the secondary spectrum.
Xu, Yonghua, Lee, Kejia, Hao, Longfei, Wang, Hongguang, Liu, Zhiyong, Yue, Youling, Yuan, Jianping, Li, Zhixuan, Wang, Min, Dong, Jiang, Tan, Jiajun, Chen, Wen, Bai, Jinming   +12 more
openaire   +2 more sources

Interstellar Scintillation of Pulsar Radiation

The Astrophysical Journal, 1969
Time fluctuations in the intensity of pulsed radiation from CP 0834, CP 1133, AP 1237, and CP 1919 have been investigated. Power spectra, modulation indices, frequency distributions, and decorrelation frequencies are consistent with scintillation theory.
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Detecting pulsars with interstellar scintillation in variance images [PDF]

Monthly Notices of the Royal Astronomical Society, 2016
Pulsars are the only cosmic radio sources known to be sufficiently compact to show diffractive interstellar scintillations. Images of the variance of radio signals in both time and frequency can be used to detect pulsars in large-scale continuum surveys using the next generation of synthesis radio telescopes.
Dai, S, Johnston, S, Bell, ME, Coles, WA, Hobbs, G, Ekers, RD, Lenc, E   +6 more
openaire   +4 more sources

Pulsar scintillation studies with LOFAR

Astronomy & Astrophysics
Context. The interstellar scintillation observed in radio pulsars arises from interference between electromagnetic waves scattered by electron density fluctuations in the turbulent interstellar plasma, providing a critical tool for probing the small ...
Cai Yanqing, Wu Ziwei, Zhu Weiwei, Verbiest Joris P. W., Liu Yulan, Moochickal Ambalappat Krishnakumar, Brüggen Marcus, Ciardi Benedetta, Dettmar Ralf-Jürgen, Fang Ziyao, Fu Qiuyang, Hoeft Matthias, Jin Jiawei, Künkel Lars, Künsemöller Jörn, Liu Caisong, Meng Lingqi, Miao Xueli, Niu Jiarui, Rejep Rukiya, Schwarz Dominik J., Shaifullah Golam M., Tiburzi Caterina, Vocks Christian, Wucknitz Olaf, Xue Mengyao, Yuan Mao, Yue Youling, Zhang Chunfeng, Zhang Zhen   +29 more
doaj   +1 more source

Scattering Delay Mitigation in High-accuracy Pulsar Timing: Cyclic Spectroscopy Techniques

The Astrophysical Journal, 2023
We simulate scattering delays from the interstellar medium to examine the effectiveness of three estimators in recovering these delays in pulsar timing data. Two of these estimators use the more traditional process of fitting autocorrelation functions to
Jacob E. Turner, Daniel R. Stinebring, Maura A. McLaughlin, Anne M. Archibald, Timothy Dolch, Ryan S. Lynch   +5 more
doaj   +1 more source

Interstellar Scintillation and Intraday Variability [PDF]

International Astronomical Union Colloquium, 1998
AbstractSources that are compact enough to show intrinsic variability on times of a day or less (IDV) at cm wavelengths must also show interstellar scintillation (ISS) on similar timescales. However for many IDV sources, the variations could be entirely due to ISS, reducing the implied brightness temperatures to ~ 1013 K or less.
openaire   +1 more source

Technology requirements of exploration beyond Neptune by solar sail propulsion [PDF]

, 2010
This paper provides a set of requirements for the technology development of a solar sail propelled Interstellar Heliopause Probe mission. The mission is placed in the context of other outer solar systems missions, ranging from a Kuiper Belt mission ...
Hughes, G.W., Macdonald, M., McInnes, C.R.   +2 more
core   +4 more sources

Using Giant Pulses to Measure the Impulse Response of the Interstellar Medium

The Astrophysical Journal, 2023
Giant pulses emitted by PSR B1937+21 are bright, intrinsically impulsive bursts. Thus, the observed signal from a giant pulse is a noisy but direct measurement of the impulse response from the ionized interstellar medium.
Nikhil Mahajan, Marten H. van Kerkwijk
doaj   +1 more source