Results 71 to 80 of about 1,334 (170)

Climatology of Plasma Irregularities Using ROTI Index From 2008 to 2023 in East West Asia

Space Weather, Volume 24, Issue 4, April 2026.
Abstract This study investigates characteristics of ionospheric irregularities over the East–West Asian equatorial region using the Rate of TEC Index (ROTI) derived from Global Navigation Satellite System (GNSS) measurements. Data from four stations (GUAM, PIMO, CUSV, and IISC) were analyzed for 2008–2023, covering solar cycle (SC) 24 and the ascending
Pandit Drabindra, Fleury Rolland, Amory‐Mazaudier Christine   +2 more
wiley   +1 more source

Refractivity and temperature climate records from multiple radio occultation satellites consistent within 0.05% [PDF]

, 2011
Data consistency is an important prerequisite to build radio occultation (RO) climatologies based on a combined record of data from different satellites.
A. K. Steiner, B. Scherllin-Pirscher, F. Ladstädter, G. Kirchengast, U. Foelsche   +4 more
core   +1 more source

Complexity and Nonlinear Dependence of Ionospheric Electron Content and Doppler Frequency Shifts in Propagating HF Radio Signals within Equatorial Regions

Atmosphere
The abundance of ions within the ionosphere makes it an important region for both long range and satellite communication systems. However, characterizing the complexity in the ionosphere within the equatorial region of Abuja, with geographic coordinates ...
Aderonke Akerele, Babatunde Rabiu, Samuel Ogunjo, Daniel Okoh, Anton Kascheyev, Bruno Nava, Olawale Bolaji, Ibiyinka Fuwape, Elijah Oyeyemi, Busola Olugbon, Jacob Akinpelu, Olumide Ajani   +11 more
doaj   +1 more source

Remote sensing of tropospheric turbulence using GPS radio occultation [PDF]

, 2016
Radio occultation (RO) measurements are sensitive to the small-scale irregularities in the atmosphere. In this study, we present a new technique to estimate tropospheric turbulence strength (namely, scintillation index) by analyzing RO amplitude ...
Ao, Chi, Shume, Esayas
core   +3 more sources

Large‐Scale Deformation, Strain Characteristics, and Locking Distribution of the Qilian‐Haiyuan Fault System

Journal of Geophysical Research: Solid Earth, Volume 131, Issue 3, March 2026.
Abstract The Qilian‐Haiyuan fault system is the main tectonic boundary of the northeastern Tibetan Plateau, controlling the regional tectonic deformation and seismic activity. Extensive Sentinel‐1 SAR data (2014–2021) are used to map the regional tectonic deformation, strain distribution, and locking along primary and secondary faults.
Donglin Wu, Chunyan Qu, Dezheng Zhao, Han Chen, Yilin Rong, Xiaoyi Wang, Xinjian Shan   +6 more
wiley   +1 more source

Space-Time Reference with an Optical Link

, 2015
We describe a method for realizing a high-performance Space-Time Reference (STR) using a stable atomic clock in a precisely defined orbit and synchronizing the orbiting clock to high-accuracy atomic clocks on the ground.
Berceau, Paul, Hollberg, Leo, Kahn, Joseph M., Taylor, Michael   +3 more
core   +1 more source

GPS scintillations associated with cusp dynamics and polar cap patches [PDF]

, 2017
This paper investigates the relative scintillation level associated with cusp dynamics (including precipitation, flow shears, etc.) with and without the formation of polar cap patches around the cusp inflow region by the EISCAT Svalbard radar (ESR) and ...
Clausen, Lasse B. N., Jin, Yaqi, Miloch, Wojciech J., Moen, Jøran I., Oksavik, Kjellmar, Spicher, Andres   +5 more
core   +3 more sources

Beyond Geostrophic and Gradient Wind: Enhancing the Estimation of Climatic Wind Fields From Radio Occultation

Earth and Space Science, Volume 13, Issue 3, March 2026.
Abstract Wind approximations, such as geostrophic and gradient wind, are limited in their ability to accurately represent atmospheric conditions in the presence of significant planetary wave activity. Those approximations, while widely applied in synoptic‐scale wind field estimation, fail to capture the full complexity of atmospheric dynamics under ...
Johannes Unegg, I. Nimac, J. Danzer
wiley   +1 more source

Signal Characteristics of Civil GPS Jammers [PDF]

, 2011
This paper surveys the signal properties of 18 commercially available GPS jammers based on experimental data. The paper is divided into two distinct tests.
Dougherty, Ryan C., Mitch, Ryan H., O'Hanlon, Brady W., Powell, Steven P., Psiaki, Mark L.   +4 more
core   +1 more source

The Evolution of a Polar Cap Patch Into a Blob in the Nightside Ionosphere: Direct Observations of Multiple Blob Formation Mechanisms Acting Simultaneously on the Same Plasma

Journal of Geophysical Research: Space Physics, Volume 131, Issue 3, March 2026.
Abstract A polar cap patch was observed to exit the polar cap to become a blob as it entered the auroral oval on the nightside of the Earth under moderately quiet geomagnetic conditions (Kp = 3−). Auroral particle precipitation led to an increase in the electron density of the blob.
S. J. Maguire, A. G. Wood, D. R. Themens, E. M. Henley, S. E. Milan, Y. Soobiah, K. Oksavik, W. J. Miloch, J. C. Coxon, M. G. Johnsen   +9 more
wiley   +1 more source