Results 111 to 120 of about 803,175 (272)

Satellite personal communications system [PDF]

, 1980
Voice channel communication between low power mobile stations dispersed over a large area is provided by a system which includes a geostationary satellite utilizing a large UHF antenna that can receive a transmission from a caller and retransmit it over ...
Reilly, N. B., Smith, J. G.
core   +1 more source

Volcanic Ash Affected by Lightning During the Hunga 2022 Eruption

Journal of Geophysical Research: Atmospheres, Volume 131, Issue 5, 16 March 2026.
Abstract The 15 January 2022 eruption of Hunga volcano (Kingdom of Tonga) produced the most lightning ever documented during an explosive eruption to date. This study estimates the mass of erupted tephra that may be structurally or electromagnetically affected by the lightning, based upon lightning peak current, channel length, and ash plume particle ...
Kimberly Genareau, Joali Paredes‐Mariño, Shane J. Cronin, Sebastian S. Harkema, Christopher J. Schultz, Kelley M. Murphy, Aaron R. Naeger   +6 more
wiley   +1 more source

METHOD AND FIRST RESULTS OF CALCULATION OF SLANT-RANGE DIFFERENCES TO ACTIVE GEOSTATIONARY TELECOMMUNICATION SATELLITE

Radio Physics and Radio Astronomy, 2015
A method for calculation of slant-range differences to the active geostationary telecommunication satellite (GEO Telecom Satellite) is described in the article. The method is developed in the “Mykolaiv Astronomical Observatory” Research Institute.
F. I. Bushuev, N. A. Kalyuzhny, Ye. S. Sybiryakova, A. V. Shulga, Yu. M. Gorbanev   +4 more
doaj   +1 more source

Numerical Parameter‐Space Studies of Various Types of Thundercloud Gamma‐Ray Emissions

Journal of Geophysical Research: Atmospheres, Volume 131, Issue 5, 16 March 2026.
Abstract Until recently, mainly two types of hard radiation were observed in thunderstorms: intensive, short‐lived terrestrial gamma‐ray flashes (TGFs) and weak, long‐lasting gamma‐ray glows (GRGs). The Airborne Lightning Observatory for Fly's Eye GLM Simulator and TGFs (ALOFT, GLM: Geostationary Lightning Mapper) flight campaign revealed additional ...
Ø. Færder, N. Lehtinen, D. Sarria, M. Marisaldi, N. Østgaard, I. Bjørge‐Engeland, A. Mezentsev   +6 more
wiley   +1 more source

Statistics of glinting clouds observed by DSCOVR and geostationary satellites

Frontiers in Remote Sensing
This study examines how frequently the specular reflection of sunlight—that is, sun glint—reveals the presence of ice crystals that maintain a steady horizontal orientation.
Tamás Várnai, Tamás Várnai, Alexander Marshak, Alexander Kostinski   +3 more
doaj   +1 more source

Satellite-based In-situ Monitoring of Space Weather:

Journal of Astronomy and Space Sciences, 2018
Many recent satellites have mission periods longer than 10 years; thus, satellite-based local space weather monitoring is becoming more important than ever. This article describes the instruments and data applications of the Korea Space wEather Monitor
Daehyeon Oh, Jiyoung Kim, Hyesook Lee, Kun-Il Jang   +3 more
doaj   +1 more source

Navigation system and method [PDF]

, 1984
In a global positioning system (GPS), such as the NAVSTAR/GPS system, wherein the position coordinates of user terminals are obtained by processing multiple signals transmitted by a constellation of orbiting satellites, an acquisition-aiding signal ...
Sennott, J. W., Taylor, R. E.
core   +1 more source

A Climatology of Mesoscale Convective System Hazards in the United States and Their Representation in a Convection‐Permitting Model

Journal of Geophysical Research: Atmospheres, Volume 131, Issue 5, 16 March 2026.
Abstract Mesoscale convective systems (MCSs) are large, organized convective storms that frequently produce flash floods and other severe hazards such as damaging winds, hail, and tornadoes. Developing an observationally based MCS hazard climatology is important for establishing a baseline to evaluate the representation of these events in numerical ...
Wenjun Cui, Kimberly A. Hoogewind, Thomas J. Galarneau Jr.   +2 more
wiley   +1 more source

A Step Toward Rainfall Erosivity Mapping Over Türkiye Using Kriging With External Drift

Hydrological Processes, Volume 40, Issue 3, March 2026.
This study maps rainfall erosivity (R factor) across Türkiye by integrating station‐based observations with satellite‐based precipitation data. The Modified Fournier Index (MFI) derived from CHIRPS was first validated against ground measurements and subsequently incorporated as auxiliary information within a kriging with external drift (KED) framework.
Sait Genar Yaldiz, Hayrullah Agaccioglu, Gert Verstraeten   +2 more
wiley   +1 more source

Communications platform payload definition study, executive summary [PDF]

Large geostationary communications platforms have been investigated in a number of studies since 1974 as a possible means to more effectively utilize the geostationary orbital arc and electromagnetic spectrum and to reduce overall satellite ...
Bertles, C. R., Clopp, H. W., Hawkes, T. A., Kao, T., Pontano, B. A.   +4 more
core   +1 more source