Results 41 to 50 of about 107 (103)

Modelling Spatial Variations of the Speed of Light [PDF]

Annalen der Physik, 2017
AbstractWe extend a new method to measure possible variation of the speed of light by using Baryon Acoustic Oscillations and the Hubble function onto an inhomogeneous pressure model of the universe. The method relies on the fact that there is a simple relation between the angular diameter distance maximum and the Hubble function (H) evaluated at the ...
Balcerzak, Adam, Dabrowski, Mariusz P., Salzano, Vincenzo   +2 more
openaire   +2 more sources

Towards operational assimilation of surface‐sensitive microwave radiances over land at Environment and Climate Change Canada: Investigation of key factors using a 1D‐EnVar framework

Quarterly Journal of the Royal Meteorological Society, Volume 152, Issue 778, July 2026 Part A.
The study evaluates five factors affecting the assimilation of surface‐sensitive Advanced Microwave Sounding Unit‐A (AMSU‐A) radiances over land, including the simultaneous estimation of surface emissivity and the standard set of state variables, to improve numerical weather prediction (NWP) at Environment and Climate Change Canada (ECCC).
Zheng Qi Wang, Mark Buehner, Yi Huang, Maziar Bani Shahabadi, Joël Bédard   +4 more
wiley   +1 more source

Spatial variation of anthropometric traits in Ireland

Human biology, 1999
To further elucidate the relationship between geography and genetics in Ireland, we considered variation in anthropometric traits of adult males by town using spatial autocorrelation methods. By describing and distinguishing significant patterns of anthropometric variation, we determined whether the anthropometric traits display a simple pattern of ...
North, Kari E., Crawford, Michael H., Relethford, John H.   +2 more
openaire   +2 more sources

Contrasting Space Weather Drivers of Two Geomagnetically Induced Current Events in Alberta, Canada During the May 2024 Superstorm

Space Weather, Volume 24, Issue 7, July 2026.
Abstract Strong geomagnetic disturbances (GMDs) caused by intense space storms induce geomagnetically induced currents (GICs) in the Earth and within long conductive infrastructure, potentially posing risks to electricity transmission systems. Here, we investigate the solar wind conditions and magnetospheric processes responsible for two significant ...
Hannah G. Parry, Darcy R. Cordell, Sneha S. Babu, Ryan MacMullin, Ian R. Mann   +4 more
wiley   +1 more source

How the 29 July 2025 M8.8 Kamchatka Earthquake Shook the Ionosphere Over Japan

Journal of Geophysical Research: Space Physics, Volume 131, Issue 7, July 2026.
Abstract This study investigates the mid‐field (∼1,100–3,800 km) ionospheric response to the 29 July 2025 Kamchatka earthquake over Japan using multi‐instrument observations, raytracing, and numerical simulations. Total electron content (TEC) observations from GPS satellite G04 and Galileo satellite E10 show a maximum TEC perturbation of ∼0.5–0.85 TECU
R. K. Barad, E. Astafyeva, S. A. Sanchez, E. A. Kherani, I. D. Ouar, C. Maréchal   +5 more
wiley   +1 more source

Stratigraphy Preserved on the Jezero Crater Rim Reveals Repeated Impacts on Early Mars

Journal of Geophysical Research: Planets, Volume 131, Issue 7, July 2026.
Abstract The outer slopes of the western Jezero crater rim are hypothesized to expose sections of Early‐ to Pre‐Noachian crust uplifted by the Jezero impact, providing an excellent opportunity to investigate the earliest geologic processes active on terrestrial planets.
Alexander J. Jones, Sanjeev Gupta, Robert Barnes, Samantha Gwizd, Kathryn M. Stack, Briony Horgan, Sanna Alwmark, Athanasios Klidaras, Eleni Ravanis, Sarah Fagents, Gerhard Paar, James F. Bell III, Justin N. Maki, Margaret Deahn, Candice Bedford, Nicolas Mangold, Michael Bramble, Justin I. Simon, Lisa Mayhew, Cathy Quantin‐Nataf, Larry Crumpler, Christoph Traxler, Chris Herd, Olivier Beyssac, Nicolas Randazzo, Uni Árting, Roger C. Wiens, Kenneth A. Farley   +27 more
wiley   +1 more source

Degradation of Rustic Canyon Crater in Gale Crater, Mars

Journal of Geophysical Research: Planets, Volume 131, Issue 7, July 2026.
Abstract The Rustic Canyon crater is a degraded impact structure on Mt. Sharp in Gale crater. The crater is irregular in plan form, ∼20 m across NW‐SE and ∼30 m across NE‐SW and lacks a raised rim. Using images and a Digital Terrain Model derived from a rover orthomosaic of the crater, we evaluated the amount and processes of degradation based on ...
J. A. Grant, S. A. Wilson, M. A. Cowart, C. M. Weitz, M. E. Hoffman, T. Kubacki, N. Milling, C. Juarez, F. J. Calef III, L. M. Thompson   +9 more
wiley   +1 more source

Spatial and temporal variations in vector fields

Optics Express, 2011
We introduce a new metric to characterise spatial variations occurring in a time varying vector field, and we derive a rotationally invariant formula that quantifies temporal fluctuations within a consistent framework. So as to highlight the physics behind these metrics, both are derived from a well-known experiment in polarimetry.
C, Macías-Romero, M R, Foreman, P, Török   +2 more
openaire   +2 more sources

Spatial and seasonal variations of the

Annales Geophysicae, 1999
A. D. Danilov, A. V. Mikhailov
openaire   +1 more source

The reality of spatial variations of morbidity and mortality.

South African medical journal = Suid-Afrikaanse tydskrif vir geneeskunde, 1975
Attention is drawn to the inadequacy of using only variations of incidence rates by area as an analytical method in geographical pathology. Problems are illustrated from recent South African literature. Since widely different sizes of population-at-risk produce incidence rates that are not of comparable reliability, advances in probability mapping can ...
openaire   +3 more sources