Results 121 to 130 of about 126,546 (328)

Genesis of the 1000-Foot Arecibo Dish [PDF]

, 2009
The giant radar/radio astronomy dish near Arecibo, Puerto Rico, was conceived by William E. Gordon in early 1958 as a back-scattering radar system to measure the density and temperature of the Earth’s ionosphere up to a few thousand kilometers.
Cohen, Marshall H.
core  

Indian Equatorial Ionosphere Under the Influence of the May 2024 Geomagnetic Storm: Insights Into Electric Fields, Plasma Irregularities and F‐Region Dynamics

Earth and Space Science, Volume 12, Issue 5, May 2025.
Abstract This study investigates the distinctive features of the daytime equatorial E‐region ionosphere using observations of HF radar (18 MHz), ionosonde, and magnetometer at Thumba (8.5°N, 77°E, dip lat = 1.9°N), India, during the extreme geomagnetic storm of May 10–11, 2024 (minimum SYM‐H ∼ −497 nT).
Lalitha G. Krishnan, Tarun Kumar Pant, T. Manu, C. Vineeth, Lijo Jose, Reuben Samson Yaqub, K. S. Vishnupriya, T. V. Sruthi   +7 more
wiley   +1 more source

Method and apparatus for calibrating the ionosphere and application to surveillance of geophysical events [PDF]

, 1984
The columnar electron content of the ionosphere between a spacecraft and a receiver is measured in realtime by cross correlating two coherently modulated signals transmitted at different frequencies (L1,L2) from the spacecraft to the receiver using a ...
Macdoran, P. F.
core   +1 more source

Guide for Conducting “Community Challenges” in Space Physics

Earth and Space Science, Volume 12, Issue 5, May 2025.
Abstract The Geospace Environment Modeling (GEM) program regularly issues “community challenges” in which researchers examine a particular space physics phenomenon or geomagnetic activity event, often running numerical models to assess dominant processes and understand the timing and relationship of observed signatures.
Michael W. Liemohn, Lutz Rastätter, Alexa J. Halford, Yihua Zheng, Katherine S. Garcia‐Sage, Robert Redmon, Sarah K. Vines   +6 more
wiley   +1 more source

Plasma and Magnetic Field Properties in Europa's Wake From Juno

Journal of Geophysical Research: Space Physics, Volume 130, Issue 5, May 2025.
Abstract We present a comprehensive synthesis of plasma and magnetic field observations during Juno's flyby through Europa's wake on 29 September 2022, which has a closest approach distance of 353 km. Compared to Galileo, Juno includes measurements of plasma electrons and mass‐per‐charge resolved ions.
R. W. Ebert, F. Allegrini, J. R. Szalay, A. Pontoni, J. Saur, F. Bagenal, S. J. Bolton, J. E. P. Connerney, G. A. DiBraccio, S. K. Howard, D. J. McComas, P. Valek, R. J. Wilson   +12 more
wiley   +1 more source

Inter-frequency Bias Estimation for the GPS Monitor Station Network [PDF]

, 2008
The inter-frequency bias (IFB) is present in all dual frequency combinations of GPS pseudorange and carrier phase observables. It is caused by the path dependent signal delays in both the satellite and receiver.
Bishop, Robert H, Harris, R. Benjamin, Holaschutz, Donny, Tolman, Brian   +3 more
core   +1 more source

Outer‐Plasmasphere Plasma Hole Scenarios Promoting Hot Zone and Sub‐Auroral Polarization Streams (SAPS) E Field Development

Journal of Geophysical Research: Space Physics, Volume 130, Issue 5, May 2025.
Abstract In this study we investigate the nightside outer‐plasmasphere plasma hole developed near the magnetic equatorial plane in two different scenarios. We demonstrate the plasmasheet earthward termination with scenario‐1 (on 17 and 20 February 2018) and the formation of new plasmapause by interchange motion with scenario‐2 (on 22 February 2018 ...
Ildiko Horvath, Brian C. Lovell
wiley   +1 more source

Electrodynamic and Ionospheric Puzzles of the 10–11 May 2024 Geomagnetic Superstorm

Journal of Geophysical Research: Space Physics, Volume 130, Issue 5, May 2025.
Abstract On 10 May 2024, a powerful coronal mass ejection arrived at Earth at 17:05UT and caused a major geomagnetic storm. With the minimum SYM‐H excursion of −497 nT (5‐min data), this storm is the largest geomagnetic disturbance since March 1989, and can be categorized as a superstorm. In this work, by using ground‐based and space‐borne instruments,
E. Astafyeva, B. Maletckii, M. Förster, I. D. Ouar, J. D. Huba, M. R. Hairston, W. R. Coley   +6 more
wiley   +1 more source

Environmental assessment overview [PDF]

, 1980
The assessment program has as its objectives: to identify the environmental issues associated with the SPS Reference System; to prepare a preliminary assessment based on existing data; to suggest mitigating strategies and provide environmental data and ...
Valentino, A. R.
core   +1 more source

Ducted Propagation of Whistler Mode Waves Observed by the Arase Satellite

Journal of Geophysical Research: Space Physics, Volume 130, Issue 5, May 2025.
Abstract Ducted propagation of whistler‐mode waves has attracted attention as a process that explains how whistler‐mode waves propagate to high latitudes, resulting in the loss of relativistic electrons to the atmosphere and changes in the upper atmosphere due to electron precipitation.
Y. Ampuku, F. Tsuchiya, S. Kurita, Y. Kasaba, Y. Katoh, M. Fukizawa, Y. Miyoshi, I. Shinohara, Y. Kasahara, S. Matsuda, A. Kumamoto, A. Matsuoka, M. Kitahara, O. Santolík   +13 more
wiley   +1 more source