Results 21 to 30 of about 588 (83)

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

ナンキョク ショウワキチ ニオケル NLC ト PMSE ノ ドウジ カンソク [PDF]

, 2013
昭和基地における夜光雲(NLC)と極域夏季中間圏レーダーエコー(PMSE)の同時観測について報告する.2009 年2 月11 日の2000 UT から2130 UTの間,昭和基地の南側において夜光雲が目視観測された.同時に,昭和基地SuperDARN 短波レーダーが近距離レンジにおいて特徴的なエコーを観測した.このエコーは小さいドップラー速度とスペクトル幅を持ち,短波レーダーによって観測されるPMSEの特徴と調和的であるが,同じ時間帯にNLCが観測されたことから,この特徴的な近距離エコーがPMSE ...
Akira Kadokura, Akira Sessai Yukimatu, Keisuke Hosokawa, Natsuo Sato, Tadahiko Ogawa, Yasuo Takeda, 佐藤 夏雄, 小川 忠彦, 武田 康男, 細川 敬祐, 行松 彰, 門倉 昭   +11 more
core   +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

Zakharov simulations of beam-induced turbulence in the auroral ionosphere [PDF]

, 2016
Recent detections of strong incoherent scatter radar echoes from the auroral F region, which have been explained as the signature of naturally produced Langmuir turbulence, have motivated us to revisit the topic of beam-generated Langmuir turbulence via ...
Akbari, H, Guio, P, Hirsch, MA, Semeter, JL   +3 more
core   +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

Improved characterization and modeling of equatorial plasma depletions [PDF]

, 2018
This manuscript presents a method to identify the occurrence of Equatorial Plasma Bubbles (EPBs) with data gathered from receivers of Global Navigation Satellite System (GNSS).
Altadill, David, Barbosa, José, Blanch Llosa, Estefania, Camps Carmona, Adriano José, González Casado, Guillermo, Juan Zornoza, José Miguel, Orús Pérez, Raul, Riba Sagarra, Jaume, Sanz Subirana, Jaume, Vázquez Grau, Gregorio   +9 more
core   +3 more sources

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

Task A, Analysis of C-W Data, Final Report [PDF]

, 1958
The object of this investigation is to obtain additional information concerning the effects of aurora on high frequency radio signals which is essential to a complete understanding of new modes of propagation that have tactical and strategic ...
Little, C. Gordon, Owren, Leif
core  

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