Results 51 to 60 of about 20,282 (172)

Mesospheric anomalous diffusion during noctilucent clouds [PDF]

, 2018
The Andenes specular meteor radar shows meteor-trail diffusion rates increasing on average by ~ 20% at times and locations where a lidar observes noctilucent clouds (NLCs).
Chau, Jorge L., Fiedler, Jens, Laskar, Fazlul I., Oppenheim, Meers M., Pallamraju, Duggirala, Pedatella, Nocholas M., Renkwitz, Toralf, Stober, Gunter, Tsutsumi, Masaki   +8 more
core   +1 more source

Observation of Mountain Waves and Secondary Gravity Waves in the Mesosphere Lower Thermosphere Above Patagonia

Journal of Geophysical Research: Atmospheres, Volume 131, Issue 6, 28 March 2026.
Abstract We find observational evidence for mountain waves (MWs) and secondary gravity waves (2GWs) in the OH*(3‐1) layer above Tierra del Fuego, Argentina. On the night of 21–22 May 2018, the Advanced Mesospheric Temperature Mapper (AMTM) obtained temperatures at ∼84 ${\sim} 84$ km.
Robert Reichert, Pierre‐Dominique Pautet, Bernd Kaifler, Sebastian Rhode, Jörn Ungermann, Kaoru Sato, Diego Janches, Steven Smith   +7 more
wiley   +1 more source

First LiDAR Observation of Quasi‐Periodic Structures in Mid‐Latitude E‐Region Meteoric Ca+ Layers

Geophysical Research Letters, Volume 53, Issue 5, 16 March 2026.
Abstract We report the first LiDAR observations of continuous quasi‐periodic (QP) metal density structures in mid‐latitude E‐region meteoric Ca+ layers using an all‐solid‐state LiDAR system in Beijing (40.4°N, 116.0°E). These QP Ca+ structures, with periods of 2–30 min and vertical wavelengths of ∼2–15 km, were primarily observed above 100 km.
Jixin Guo, Tao Yu, Lifang Du, Jin Wang, Xiangxiang Yan, Yan Yu, Wenyu Hao, Yifan Qi, Haoran Zheng, Guotao Yang   +9 more
wiley   +1 more source

On the validity of the ambipolar diffusion assumption in the polar mesopause region [PDF]

Annales Geophysicae, 2008
The decay of underdense meteor trails in the polar mesopause region is thought to be predominantly due to ambipolar diffusion, a process governed by the ambient temperature and pressure.
A. P. Ballinger, P. B. Chilson, R. D. Palmer, N. J. Mitchell   +3 more
doaj   +1 more source

Epilogue: Towards an Abolitionist Camp Studies

Population, Space and Place, Volume 32, Issue 2, March 2026.
ABSTRACT Camp studies have grown markedly in recent years. While the field has by and large been critical of camps as spatial technologies of protective custody, biopolitical control, minority oppression, racial segregation, custodial care, militarised rule and colonisation, there has been a reluctance to embrace more overtly abolitionist approaches ...
Hanno Brankamp
wiley   +1 more source

Determination of meteor-head echo trajectories using the interferometric capabilities of MAARSY [PDF]

Annales Geophysicae, 2013
During the flight of a meteoroid through the neutral atmosphere, the high kinetic energy is sufficient to ionize the meteoric constituents. Radar echoes coming from plasma irregularities surrounding the meteoroids are called meteor-head echoes, and ...
C. Schult, G. Stober, J. L. Chau, R. Latteck   +3 more
doaj   +1 more source

First Coincident Radar and Optical Observations of a Meteor Radio Afterglow

Journal of Geophysical Research: Space Physics, Volume 131, Issue 3, March 2026.
Abstract It has been hypothesized that Meteor Radio Afterglows (MRAs) occur due to resonant transition radiation (RTR) where suprathermal electrons emit as they pass through electron density inhomogeneities in a turbulent plasma. Meteor trails are thought to produce suprathermal electrons through anion oxidation, which can be identified through meteor ...
K. S. Obenberger, J. L. Chau, J. Vierinen, D. Vida, L. E. Cordonnier, Z. Balint, M. Clahsen, E. Dao, J. Dowell, J. M. Holmes, R. F. Kelly, D. Kastinen, N. Pfeffer, K. Robinson, G. B. Taylor, J. M. Urco   +15 more
wiley   +1 more source

1I/2017 U1 (`Oumuamua) is Hot: Imaging, Spectroscopy and Search of Meteor Activity [PDF]

, 2017
1I/2017 U1 (`Oumuamua), a recently discovered asteroid in a hyperbolic orbit, is likely the first macroscopic object of extrasolar origin identified in the solar system.
Brown, Peter G., Kelley, Michael S. P., Ye, Quan-Zhi, Zhang, Qicheng   +3 more
core   +3 more sources

Temperature tides determined with meteor radar [PDF]

Annales Geophysicae, 2002
Abstract. A new analysis method for producing tidal temperature parameters using meteor radar measurements is presented, and is demonstrated with data from one polar and two mid-latitude sites. The technique further develops the temperature algorithm originally introduced by Hocking (1999).
W. K. Hocking, W. K. Hocking, A. Hocking
openaire   +4 more sources

Thermospheric Energy and Heating Due To Upward Propagating and in Situ Generated Tides During Solar Cycle 24

Journal of Geophysical Research: Space Physics, Volume 131, Issue 3, March 2026.
Abstract We investigate vertical and horizontal energy transport and associated heating in the thermosphere due to both upward propagating and in situ generated migrating and nonmigrating diurnal and semidiurnal tides over the solar cycle 24 (2009–2019).
Mukta Neogi, Jens Oberheide, Xian Lu
wiley   +1 more source