Results 31 to 40 of about 79,833 (199)

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

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

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

Turbulence in the interstellar medium [PDF]

, 2014
Turbulence is ubiquitous in the insterstellar medium and plays a major role in several processes such as the formation of dense structures and stars, the stability of molecular clouds, the amplification of magnetic fields, and the re-acceleration and ...
Chian, A. C. -L., Chian, A. C.-L., G. Kowal, Falgarone, E., E. Falgarone, Falceta-Goncalves, D., Kowal, G., Chian, A., A. C.-L. Chian, D. Falceta-Gonçalves   +9 more
core   +2 more sources

A Multi‐Purpose Heliophysics L4 Mission

Space Weather, Volume 19, Issue 9, September 2021., 2021
Abstract The Earth‐Sun Lagrangian point 4 is a meta‐stable location at 1 AU from the Sun, 60° ahead of Earth's orbit. It has an uninterrupted view of the solar photosphere centered on W60, the Earth's nominal magnetic field connection to the Sun. Such a mission on its own would serve as a solar remote sensing observatory that would oversee the entire ...
A. Posner, C. N. Arge, J. Staub, O. C. StCyr, D. Folta, S. K. Solanki, R. D. T. Strauss, F. Effenberger, A. Gandorfer, B. Heber, C. J. Henney, J. Hirzberger, S. I. Jones, P. Kühl, O. Malandraki, V. J. Sterken   +15 more
wiley   +1 more source

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

Directionality of the Martian Surface Radiation and Derivation of the Upward Albedo Radiation

Geophysical Research Letters, Volume 48, Issue 15, August 2021., 2021
Abstract Since 2012 August, the Radiation Assessment Detector (RAD) on the Curiosity rover has been characterizing the Martian surface radiation field which is essential in preparation for future crewed Mars missions. RAD observed radiation dose is influenced by variable topographical features as the rover traverses through the terrain.
Jingnan Guo, Salman Khaksarighiri, Robert F. Wimmer‐Schweingruber, Donald M. Hassler, Bent Ehresmann, Cary Zeitlin, Sven Löffler, Daniel Matthiä, Thomas Berger, Günther Reitz, Fred Calef   +10 more
wiley   +1 more source

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

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