Results 61 to 70 of about 1,492 (208)
Earth and Space Science, Volume 12, Issue 8, August 2025.Abstract The low‐latitude ionosphere has complex longitude structures under the effects of various space environment factors such as non‐migrating tides and the geomagnetic field. In this study, a distinctive wave‐1 dominated longitude pattern occurring in the early morning sector was revealed from the ROCSAT‐1 observation for the low‐latitude topside ...
Yiding Chen +3 more
wiley +1 more source
Satellite Traces: Ionogram Signatures of Bottom‐Side Upwelling Structures ‐ A Simulation Study
Geophysical Research Letters, Volume 52, Issue 7, 16 April 2025.Abstract Satellite Traces (STs) are the important ionogram signatures for the presence of upwellings in the bottom‐side ionosphere, which provide the necessary seed perturbation for the development of equatorial plasma bubbles (EPBs). In this study, a virtual ionosonde experiment is simulated to investigate the various ST signatures under the presence ...
M. Ankita +6 more
wiley +1 more source
Incoherent Scatter Measurements of F-Region Density, Temperatures, and Vertical Velocity at Millstone Hill [PDF]
, 1970 The Millstone Hill Thomson (incoherent) scatter radar system has been operated routinely since 1963 to perform a synoptic study of F-region electron densities, and electron and ion temperatures.
Evans, J. V., Julian, R. F., Reid, W. A.
core +1 more source
Electron Beams Generated by the Electron Kelvin‐Helmholtz Instability at a Quasi‐Perpendicular Shock
Geophysical Research Letters, Volume 52, Issue 5, 16 March 2025.Abstract Electron beams are considered to be important free energy sources for the excitation of various plasma waves at quasi‐perpendicular shocks. In this article, we perform a two‐dimensional particle‐in‐cell simulation of a low‐plasma‐β quasi‐perpendicular shock.
Ao Guo +4 more
wiley +1 more source
Study on the Detectability of the Sky-Surface Wave Hybrid Radar
Journal of Applied Mathematics, 2014 Working in the HF (high-frequency) band and the transmitter and receiver locating separately, the sky-surface wave hybrid radar both has the capabilities of the OTHR (over-the-horizon radar) and the advantage of the bistatic radar. As the electromagnetic
Hou Chengyu +3 more
doaj +1 more source
, 2017 15th MST Radar Workshop (May 27-30, 2017, NIPR)18th EISCAT symposium (May 26-31, 2017 ...
core +1 more source
Statistical Characteristics of Nighttime ULF Waves Observed on the Surface of Mars by InSight
Journal of Geophysical Research: Space Physics, Volume 130, Issue 3, March 2025.Abstract Interior Exploration using Seismic Investigations, Geodesy and Heat Transport (InSight) Fluxgate Magnetometer returned data from the Martian surface throughout the course of the InSight mission, between November 2018 and May 2022. Ultra‐low frequency (ULF) electromagnetic waves are commonly observed by InSight during nighttime hours.
K. Webster, Y. Ma, S. Joy, P. J. Chi
wiley +1 more source
Comparative Analysis of Performance for Optimization‐Based Transionospheric SAR Autofocus
Radio Science, Volume 60, Issue 2, February 2025.Abstract For a spaceborne synthetic aperture radar (SAR) operating on low frequencies (such as P‐band), turbulence in the Earth's ionosphere may cause significant phase perturbations of the interrogating signals. These perturbations depend on both the antenna and target coordinates and may lead to substantial image distortions. In our previous work, we
Mikhail Gilman, Semyon Tsynkov
wiley +1 more source
Ambiguity and area preserving linear transformations in over‐the‐horizon radar
IET Radar, Sonar &Navigation, Volume 19, Issue 1, January/December 2025.The use of recurrent waveforms in over‐the‐horizon radar (OTHR) necessitates techniques for ambiguity resolution and manipulation. In this paper, the authors elucidate methods for systematically transforming any given waveform so that its ambiguity function is transformed by any desired area preserving the linear transformation of the delay‐Doppler ...
Stephen D. Howard, Van Khanh Nguyen
wiley +1 more source
Method to determine the optimal parameters of the Arecibo 46.8-MHz antenna system [PDF]
, 1986 The spherical reflector at the Arecibo Observatory (AO) offers great advantages for the design of simple and inexpensive high performance steerable antennas at VHF.
Hagen, J. B. +3 more
core +1 more source