Results 11 to 20 of about 736 (212)

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   +5 more sources

Single-pulse-based Interstellar Scintillation Studies of RRATs [PDF]

The Astrophysical Journal Letters
The nature of irregularly spaced pulses of rotating radio transients (RRATs) complicates interstellar scintillation studies. In this Letter, we report the primary scintillation parameters of a sample of RRATs using pairwise correlations of pulse spectra.
Zi-wei Wu, Wei-wei Zhu, Zi-yao Fang, Qiu-yang Fu, Ji-guang Lu, Ling-qi Meng, Chen-Chen Miao, Xue-li Miao, Jia-rui Niu, Rukeya Rejiefu, Xun Shi, Chao Wang, Meng-yao Xue, Mao Yuan, You-ling Yue, Chun-feng Zhang, Zhen Zhang, Shi-jun Dang, Yu-lan Liu   +18 more
doaj   +2 more sources

Pulsar Scintillation and Interstellar Lenses [PDF]

, 2023
The radio emission of pulsars is scattered within the interstellar medium due to variations of the electron column density. Pulsars are very compact sources of pulsed radiation and, thus, emit spatially coherent radiation leading to observable interference of scattered paths. The corresponding amplitude variations are called scintillation.
Sprenger, Tim
openaire   +4 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   +7 more sources

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   +7 more sources

The Reaction of Muonium with Hydrogen Peroxide in Aqueous Solution

ChemPhysChem, Volume 24, Issue 21, November 2, 2023., 2023
Experimental data on muonium kinetics in water greatly expands the set of experimental data on kinetic isotope effects in the reactions of H atoms with H2O2 and its conjugate base HOO−. Abstract Rate constants for the reactions of muonium (Mu) (the ultralight isotope of the hydrogen atom) with H2O2 in H2O and D2O2 in D2O have been determined at various
Paul W. Percival, Jean‐Claude Brodovitch   +1 more
wiley   +1 more source

Resolving Moving Heliospheric Structures Using Interplanetary Scintillation Observations With the Murchison Widefield Array

Space Weather, Volume 21, Issue 10, October 2023., 2023
Abstract We have conducted a blind search in 49 consecutive days of interplanetary scintillation observations made by the Murchison Widefield Array from mid‐2019, with overlapping daily observations approximately East and South‐East of the Sun at an elongation of ∼30° and a field of view of 30°.
A. Waszewski, J. S. Morgan, R. Chhetri, R. Ekers, M. C. M. Cheung, N. D. R. Bhat, M. Johnston‐Hollitt   +6 more
wiley   +1 more source

Unfolding the Neutron Flux Spectrum on the Surface of Mars Using the MSL‐RAD and Odyssey‐HEND Data

Space Weather, Volume 21, Issue 8, August 2023., 2023
Abstract Understanding the long‐term radiation environment at the surface of Mars allows us to estimate the exposure for future robotic and crewed missions. Typically, the radiation environment includes charged particles (i.e., protons and heavier ions) and neutral particles (i.e., gamma rays and secondary neutrons).
L. M. Martinez Sierra, I. Jun, B. Ehresmann, C. Zeitlin, J. Guo, M. Litvak, K. Harshman, D. Hassler, I. G. Mitrofanov, D. Matthiä, S. Loffler   +10 more
wiley   +1 more source

Following the Path of Least Resistance

Perspectives of Earth and Space Scientists, Volume 3, Issue 1, December 2022., 2022
Abstract The reason a path may be the path of least resistance is because it may be the path for which you are most suited. For you it may look like a stroll in the park; for someone else, it may look like climbing Everest. Or vice versa. Taking the “easy” route is not copping out; it is a form of playing to your strength. Here I detail my professional
Donald G. Mitchell
wiley   +1 more source

Extremely inverted peaked spectrum radio sources

Astronomische Nachrichten, Volume 342, Issue 9-10, Page 1126-1129, November-December 2021., 2021
Abstract We report our ongoing search for extremely inverted spectrum compact radio galaxies, for which the defining feature in the radio spectrum is not the spectral peak, but instead the slope of the spectrum () in the high‐opacity (i.e., lower frequency) part of the radio spectrum.
Mukul Mhaskey, Surajit Paul, Gopal Krishna   +2 more
wiley   +1 more source