Results 11 to 20 of about 66 (59)

Characterization of a Lava Plain NW of Ascraeus Mons, Mars, Through Surface Morphometric Analyses and SHARAD Subsurface Detections

Journal of Geophysical Research: Planets, Volume 131, Issue 1, January 2026.
Abstract The Martian lava plains are characterized by their extensive, low‐relief surfaces, which are the result of numerous basaltic eruptions and feature a variety of volcanic landforms, including vents, cones, pits, and skylights. The combination of these features and impact craters yields a significant understanding of the planet's geological past ...
G. Nodjoumi, S. E. Lauro, M. Valiante, E. Luzzi, A. P. Rossi   +4 more
wiley   +1 more source

Forecasting Equatorial Plasma Bubbles From Precursor TEC Signatures Observed by C/NOFS

Space Weather, Volume 24, Issue 1, January 2026.
Abstract This study investigates the potential of localized total electron content (TEC) perturbation measurements, possibly associated with bottomside upwelling of the F‐layer, as precursors for forecasting ionospheric plasma irregularities, particularly the equatorial plasma bubbles (EPBs).
S. K. Das, C. Stolle, Y. Yamazaki, T. Yokoyama, M. Yamamoto, S. Perwitasari   +5 more
wiley   +1 more source

Upwelling Metallic Ions Producing Valley Region Irregularities Over Low Latitude During the 2025 New Year Magnetic Storm

Geophysical Research Letters, Volume 52, Issue 24, 28 December 2025.
Abstract Valley region irregularities (VRIs) have been previously investigated using radar, ionosonde, and rocket‐borne in situ observations. In this paper, based on a joint observational experiment by lidar and radars performed in Hainan, China, we report a case of low‐latitude VRIs generated in association with uplifted metallic ions for the first ...
Jing Jiao, Wenjie Sun, Guozhu Li, Yajun Zhu, Biqiang Zhao, Guotao Yang, Tatsuhiro Yokoyama, Septi Perwitasari, Lianhuan Hu, Jianfei Liu, Haiyong Xie, Zhaoguo Huang, Xiaofei Wu, Chunxiao Yan   +13 more
wiley   +1 more source

First Observation of Localized F Region Bottom‐Type Scattering Layer by All‐Sky Radar at Low Latitude

Geophysical Research Letters, Volume 52, Issue 23, 16 December 2025.
Abstract F‐region bottom‐type scattering layers (BSLs) occurring over equatorial and low latitudes may act as the precursor of plasma bubbles, usually observed by narrow‐beam very high frequency radars. However, their spatial features remain unknown due to the radar narrow field‐of‐view.
Wenjie Sun, Guozhu Li, Lianhuan Hu, Biqiang Zhao, Jianfei Liu, Haiyong Xie, Guofeng Dai, Xiukuan Zhao, Yi Li, Baiqi Ning   +9 more
wiley   +1 more source

Radar Polarimetry in Glaciology: Theory, Measurement Techniques, and Scientific Applications for Investigating the Anisotropy of Ice Masses

Reviews of Geophysics, Volume 63, Issue 4, December 2025.
Abstract Dielectric anisotropy in ice alters the propagation of polarized radio waves, so polarimetric radar sounding can be used to survey anisotropic properties of ice masses. Ice anisotropy is either intrinsic, associated with ice‐crystal orientation fabric (COF), or extrinsic, associated with material heterogeneity, such as bubbles, fractures, and ...
Benjamin H. Hills, T. J. Young, David A. Lilien, Esther Babcock, Nicole Bienert, Donald Blankenship, John Bradford, Giancorrado Brighi, Alex Brisbourne, Jørgen Dall, Reinhard Drews, Olaf Eisen, M. Reza Ershadi, Tamara A. Gerber, Nicholas Holschuh, Daniela Jansen, Thomas M. Jordan, Nanna B. Karlsson, Jilu Li, Carlos Martín, Kenichi Matsuoka, Daniel May, Falk M. Oraschewski, John Paden, Nicholas M. Rathmann, Neil Ross, Dustin M. Schroeder, Martin Siegert, Matthew R. Siegfried, Emma Smith, Ole Zeising   +30 more
wiley   +1 more source

D‐Region Changes and Wave Activity Detected From Unusually Strong VLF Anomalies Associated With the January 2022 Tonga Volcanic Eruption

Journal of Geophysical Research: Space Physics, Volume 130, Issue 11, November 2025.
Abstract We present unusually strong daytime signal amplitude anomalies of 11.1 dB on JJI and 12.6 dB on VTX very low‐frequency (VLF) transmitter signals recorded at Suva, Fiji, due to the powerful Hunga Tonga–Hunga Ha'apai (HTHH) volcanic eruption (VE) on 15 January 2022 around 04:00 UT.
Sushil Kumar, Sarwan Kumar, Mie Ichihara
wiley   +1 more source

Formation of the Ionospheric G‐Condition Following the 2017 Great American Eclipse

Earth and Space Science, Volume 12, Issue 8, August 2025.
Abstract A total solar eclipse (TSE) traversed the continental US (CONUS) from west to east on 21 August 2017. Ionosondes located under the eclipse totality at Lusk (Wyoming) and Boulder (Colorado) observed the ionospheric G‐condition 20 min after totality.
S. Chakraborty, L. Qian, S. Mrak, J. Mabie, L. Goncharenko, J. M. Mclnerney, T. Bullett   +6 more
wiley   +1 more source

Direct Observation of Quasi‐Monochromatic Gravity Wave Packets Associated With the Polar Night Jet Using a Doppler‐Rayleigh Lidar

Journal of Geophysical Research: Atmospheres, Volume 130, Issue 14, 28 July 2025.
Abstract An advanced hodograph technique was applied to extract quasi‐monochromatic, linear gravity wave (GW) packets from simultaneous wind and temperature measurements made using a ground‐based Doppler‐Rayleigh‐Mie‐Raman lidar located in Kühlungsborn (54°N, 12°E).
Robin Wing, Irina Strelnikova, Andreas Dörnbrack, Michael Gerding, Eframir Franco‐Diaz, Laura Holt, Mohamed Mossad, Gerd Baumgarten   +7 more
wiley   +1 more source

Evolution of Post‐Sunset EPBs: Relationships to the EIA Induced by Pre‐Reversal Enhancement Electric Fields

Space Weather, Volume 23, Issue 7, July 2025.
Abstract This paper presents Global Navigation Satellite System radio occultation (RO) observational analyses on deducing the relationships and dependences between post‐sunset equatorial plasma bubbles (EPB) occurrences and equatorial ionospheric anomaly (EIA) strength variability.
Lung‐Chih Tsai, Shin‐Yi Su, Harald Schuh, Mohamad Mahdi Alizadeh, Jens Wickert   +4 more
wiley   +1 more source

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