Results 41 to 50 of about 2,212 (160)
Polarization in Low Frequency Radio Astronomy
, 2019 This chapter introduces the concepts of polarimetry in the case of low frequency radio astronomy. In this regime radio waves are usually not the signature of atomic or molecular transitions lines, but rather that of unstable particle distribution functions releasing their free energy through electromagnetic radiation.
openaire +2 more sources
Interaction of suprathermal solar wind electron fluxes with sheared whistler waves: fan instability [PDF]
Annales Geophysicae, 2003 Several in situ measurements performed in the solar wind evidenced that solar type III radio bursts were some-times associated with locally excited Langmuir waves, high-energy electron fluxes and low-frequency electrostatic and electromagnetic ...
C. Krafft, A. Volokitin
doaj +1 more source
The Murchison Widefield Array Enters Adolescence: A Personal Review of the Early Years of Operations
GalaxiesThe Murchison Widefield Array (MWA) is a low frequency radio interferometer designed and developed by an international consortium, operated on behalf of the consortium by Curtin University.
Steven J. Tingay
doaj +1 more source
RFI Cancellation for an Array Radio Astronomy System With Receiver Nonlinearity
IEEE Access, 2019 Radio frequency interference (RFI) is an important problem for a radio astronomy system (RAS) due to the very weak radio astronomical signals. Rapid expansions of active wireless systems (AWSs), as well as more demands for spectrum access by both AWS and
Mahmoud E. Abdelgelil, Hlaing Minn
doaj +1 more source
MONITORING OF REGULAR AND SPORADIC IONOSPHERIC VARIATIONS ON THE SINGLE-HOP HF RADIO PATHS [PDF]
Radio Physics and Radio Astronomy, 2018 Purpose: Diagnostics of regular and sporadic ionospheric variations using coherent systematic monitoring of spectral characteristics of the probe HF signals on the inclined singlehop radio paths.
A. I. Reznychenko +2 more
doaj +1 more source
Photonic swarm for low frequency radio astronomy in Space
, 2017 Radio astronomy from 100 kHz to 30 MHz allows compelling science that requires a new space based interferometer at a considerable distance from the Earth. We propose a new satellite concept which has a series of dipole antennas connected to the satellite using tethers.
Kruithof, G.H. +5 more
openaire +2 more sources
Low Frequency Radio Astronomy from Above the Ionosphere [PDF]
Symposium - International Astronomical Union, 2002 The GMRT represents a dramatic improvement in ground-based observing capabilities for low frequency radio astronomy. At sufficiently low frequencies, however, no ground-based facility will be able to produce high resolution images while looking through the ionosphere.
openaire +1 more source
A FAST Survey of H I Absorption in Low-power Radio Sources
The Astrophysical JournalWe conducted a H i 21 cm absorption study of a sample of 147 nearby ( z < 0.1) low-power radio sources with 10 mJy < S _1.4 GHz < 30 mJy and $\mathrm{log}({P}_{1.4\,{\rm{GHz}}}/{\rm{W}}\,{{\rm{Hz}}}^{-1})=20.5\,\unicode{x02013}\,23.7$ , using the Five ...
Yang Su +5 more
doaj +1 more source
The Astrophysical Journal Supplement SeriesWe analyze a catalog comprising 781,232 spectra from 641,095 M dwarf stars from the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) low-resolution spectroscopic data release 9.
Wenjie Li +5 more
doaj +1 more source
Revealing the Spectral Properties of Magnetic Turbulence by Synchrotron Polarization Gradients
The Astrophysical JournalBased on the modern understanding of MHD turbulence theory, we propose a new method for measuring the spectral properties of magnetic turbulence by synchrotron polarization gradient analysis.
Jian-Fu Zhang, Zi-Qi Liu
doaj +1 more source