Results 71 to 80 of about 24,137 (262)

Vertical Velocity and Diabatic Heating Top‐Heaviness in the Convective Evolution Over Tropical Oceans

Journal of Geophysical Research: Atmospheres, Volume 130, Issue 19, 16 October 2025.
Abstract Convective heating and vertical motion are closely linked to each other and follow similar evolutionary paths over their convective life cycle. It has not yet been extensively explored, using observation, how such a collaborative evolution changes systematically from region to region over tropical oceans.
Yi‐Chien Chen, Hirohiko Masunaga
wiley   +1 more source

Impact of gravity wave drag on the thermospheric circulation: implementation of a nonlinear gravity wave parameterization in a whole-atmosphere model [PDF]

Annales Geophysicae, 2019
To investigate the effects of the gravity wave (GW) drag on the general circulation in the thermosphere, a nonlinear GW parameterization that estimates the GW drag in the whole-atmosphere system is implemented in a whole-atmosphere general circulation ...
Y. Miyoshi, E. Yiğit
doaj   +1 more source

Validation of a Global Geospace Model With a Systems Science Approach Based on Canonical Correlation Analysis

Geophysical Research Letters, Volume 52, Issue 19, 16 October 2025.
Abstract A systems science approach based on canonical correlation analysis (CCA) is applied as a new, behavioral way to validate global geospace models. The biggest novelty of the technique is that it validates models at a system level, whereby a side‐by‐side comparison is performed of CCA applied to a 30‐day observational and the corresponding ...
Gian Luca Delzanno, Brianna Isola, Christian Lao, Joseph E. Borovsky, Kareem Sorathia, Viacheslav G. Merkin, Oleksandr Koshkarov, Andrew McCubbin, Jeff Garretson, Harry Arnold, Dong Lin   +10 more
wiley   +1 more source

Thermospheric Neutral Wind Measurements and Investigations across the African Region—A Review

Atmosphere, 2022
This paper briefly reviews studies of thermospheric neutral wind dynamics over the African region. The literature includes a review of the observations of neutral winds over five African locations using the Fabry–Perot Interferometer (FPI), and the ...
Daniel Okoh, Aziza Bounhir, John Bosco Habarulema, Babatunde Rabiu, Zama Katamzi-Joseph, Taiwo Ojo, Qian Wu, Jonathan J. Makela   +7 more
doaj   +1 more source

High‐Spatial Resolution Space‐Based Observations in the Upper Troposphere and Upper Mesosphere of Wavelike Features Produced by Hurricane Ian

Geophysical Research Letters, Volume 52, Issue 19, 16 October 2025.
Abstract A new high‐spatial resolution camera on the International Space Station used OH nightglow in the H‐band to image the ground at an ∼ ${\sim} $70 m pixel footprint over an ∼ ${\sim} $280 km swath and maintained this resolution during its 1.5 s exposure.
J. H. Hecht, D. S. Nolan, L. J. Gelinas, R. L. Walterscheid   +3 more
wiley   +1 more source

Exploring the Long-Term Relationship Between Thermospheric ∑O/N₂ and Solar EUV Flux

Remote Sensing
Column O/N2 ratio (∑O/N2), a physical quantity representing thermospheric disturbances, is influenced by solar extreme ultraviolet radiation flux (QEUV) changes.
Hao Li, Cunying Xiao, Kuan Li, Zewei Wang, Xiaoqi Wu, Yang Yu, Luo Xiao   +6 more
doaj   +1 more source

On the role of ozone in long-term trends in the upper atmosphere-ionosphere system [PDF]

Annales Geophysicae, 2012
Origin of long-term trends in the thermosphere-ionosphere system has been discussed since the beginning of trend studies. The two most prioritized explanations have been those via long-term increase of atmospheric concentration of greenhouse gases and
J. Laštovička
doaj   +1 more source

Long-term geospace climate monitoring

Frontiers in Astronomy and Space Sciences, 2023
Climate change is characterized by global surface warming associated with the increase of greenhouse gas population since the start of the industrial era.
Shun-Rong Zhang, Ingrid Cnossen, Jan Laštovička, Ana G. Elias, Xinan Yue, Christoph Jacobi, Jia Yue, Jia Yue, Wenbin Wang, Liying Qian, Larisa Goncharenko   +10 more
doaj   +1 more source

Direct Kelvin‐Helmholtz Instability Detection at the Ionospheric E Region Electron Density

Geophysical Research Letters, Volume 52, Issue 19, 16 October 2025.
Abstract New high‐resolution measurements by Sanya incoherent scatter radar (ISR) employing a wide‐bandwidth chirp signal now enable spatiotemporal resolutions of 37.5 m and 50 s. We have applied these new capabilities for observations of Kelvin‐Helmholtz instability (KHI) dynamics in the low‐latitude ionosphere E region.
Junyi Wang, Xinan Yue, Yihui Cai, Feng Ding, Xu Zhou, Jorge L. Chau, David C. Fritts, Juha Vierinen, Alan Z. Liu   +8 more
wiley   +1 more source

Direct Radiation Belt Injections and Their Auroral Counterparts

Geophysical Research Letters, Volume 52, Issue 19, 16 October 2025.
Abstract We present a case study of a moderate geomagnetic storm, which exhibits an abrupt relativistic enhancement in the heart of the radiation belt accompanied by low‐latitude purple auroral emission. The relativistic enhancement occurs on a timescale of tens of minutes and reaches MeV energies deep within the inner magnetosphere. The enhancement is
K. A. Sorathia, M. Shumko, J. Liang, H. Arnold, G. Sinha, V. G. Merkin, A. Sciola, A. Michael, D. Lin, S. Bao, Y. Pan, J. Garretson, D. Turner, A. Y. Ukhorskiy   +13 more
wiley   +1 more source