Results 31 to 40 of about 736 (212)

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 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

Microarcsecond structure of an AGN Jet via Interstellar Scintillation [PDF]

, 2015
We have used the broadband backend available at the ATCA to study the fast interstellar scintillation of quasar PKS 1257-326, resolving the core shift as a function of frequency on scales less than 10 microarcseconds.
Bignall, H., Macquart, Jean-Pierre, Jauncey, D., Godfrey, L., Hodgson, J., Macquart, J.   +5 more
core   +1 more source

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

Magnetic Reconnection in the Space Sciences: Past, Present, and Future

Journal of Geophysical Research: Space Physics, Volume 125, Issue 2, February 2020., 2020
Abstract Magnetic reconnection converts, often explosively, stored magnetic energy to particle energy in space and in the laboratory. Through processes operating on length scales that are tiny, it facilitates energy conversion over dimensions of, in some cases, hundreds of Earth radii.
M. Hesse, P. A. Cassak
wiley   +1 more source

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.
openaire   +2 more sources

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

Interstellar scintillation as a cosmological probe: Prospects and challenges [PDF]

, 2012
The discovery that interstellar scintillation (ISS) is suppressed for compact radiosources at z 2 has enabled ISS surveys to be used as cosmological probes.
Macquart, Jean-Pierre, Lovell, J., Rickett, B., Jauncey, D., Reynolds, C., Kedziora-Chudczer, L., Bignall, Hayley, Koay, J., Pursimo, T., Ojha, R   +9 more
core   +1 more source

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