Results 31 to 40 of about 12,139 (116)

Photometric Studies of Auroral Luminosity and its Connection with Some Atmosphere Ionization Phenomena [PDF]

, 1958
The auroral radiation, 3914 AO, received from the entire sky on a horizontal diffusing plate was monitored continuously during the nights of 1955-56 and 1956-57. The 1955-56 data and part of the 1956-57 data were used to obtain a diurnal curve for the
Murcray, W. B.
core  

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

In Situ Validation of Small‐Scale Spatial Variability in Significant Wave Height Observations From SWOT

Earth and Space Science, Volume 12, Issue 12, December 2025.
Abstract Ocean surface wave climates are shaped by both atmospheric forcing and underlying ocean conditions. Variability in open‐ocean wave heights subsequently reflects complex interactions occurring across a broad range of spatial and temporal scales.
Allison Ho, Jinbo Wang, Bruce Haines, Andy Wu, Scott Stalin   +4 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  

Are Cusp‐Aligned Arcs the Equivalent of Auroral Streamers in a Closed Magnetosphere?

Journal of Geophysical Research: Space Physics, Volume 130, Issue 12, December 2025.
Abstract We present the first observations of a 3‐hour quasi‐periodic intensification of the polar auroras during a prolonged interval of strongly‐northward interplanetary magnetic field (IMF). This takes the form of a localized spot of auroral emission that appears near the pole which subsequently spreads sunward and antisunward to produce a sun ...
S. E. Milan, M. K. Mooney, G. E. Bower, G. Kennedy, X.‐Y. Wang, B. Hubert, M. R. Hairston, L. J. Paxton   +7 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

Probing the Climatological Impact of a Cosmic Ray-Cloud Connection through Low-Frequency Radio Observations

, 2011
It has been proposed that cosmic ray events could have a causal relationship with cloud formation rates. Given the weak constraints on the role that cloud formation plays in climate forcing it is essential to understand the role such a relationship could
Kavic, Michael, Magee, Nathan
core   +1 more source

Chemical Heating as a Feedback Mechanism in the Mesopause Region

Geophysical Research Letters, Volume 52, Issue 20, 28 October 2025.
Abstract An analytical expression is derived which shows that the release of chemical heat from exothermic chemical reactions is a negative nonlinear feedback mechanism relative to temperature in the mesopause region. This role is confirmed through model simulations. This feedback mechanism stabilizes the thermal regime of the mesopause region.
M. Grygalashvyly, W. Ward, C. C. Stephan, P. Hartogh   +3 more
wiley   +1 more source