Results 101 to 110 of about 4,774 (237)

Earthward Propagated Auroral Kilometric Radiation: Observations From Polar

Geophysical Research Letters, Volume 53, Issue 12, 28 June 2026.
Abstract Auroral Kilometric Radiation (AKR), the strongest natural radio emission from Earth's magnetosphere, has been primarily observed in space. It is generally understood to propagate anti‐Earthward and be detected at large radial distances, while Earthward‐directed waves are thought to be blocked by the ionosphere. Surprisingly, AKR‐like emissions
Olha Melnychenko, Siyuan Wu, Daniel K. Whiter, Baptiste Cecconi, Claire Baskvetich   +4 more
wiley   +1 more source

Rotational modulation and local time dependence of Saturn's infrared H3+ auroral intensity [PDF]

, 2012
Planetary auroral emissions reveal the configuration of magnetospheric field-aligned current systems. In this study, Cassini Visual and Infrared Mapping Spectrometer (VIMS) observations of Saturn's pre-equinox infrared H3+ aurorae were analysed to show ...
Baines, K. H., Badman, S. V., Kimura, T., Baines, K., Tao, C., Lamy, L., Andrews, David J.,, Badman, S., Provan, G.,, Cowley, S., Tao, C.,, Kasahara, S., Andrews, D., Brown, R. H.,, Lamy, L.,, Brown, R., Kasahara, S.,, Cowley, S. W. H.,, Kimura, T.,, Stallard, T.,, Stallard, T., Provan, G., Fujimoto, M., Andrews, D. J., Melin, H.,, Melin, H., Badman, S. V.,, Brown, R. H., Baines, K. H.,, Cowley, S. W. H., Fujimoto, M.,   +30 more
core   +1 more source

The Drag of Ionosphere Plasma Drifts on Thermospheric Zonal Winds During the 10–12 May 2024 Superstorm

Geophysical Research Letters, Volume 53, Issue 11, 16 June 2026.
Abstract The observations from GRACE‐FO and DMSP satellites are utilized to analyze the ion‐neutral interaction near dusk during the 10–12 May 2024 super‐storm. The horizontal plasma convection dragged the anti‐sunward wind in the polar cap and sunward winds around the auroral and subauroral regions during whole storm times.
Ruilong Zhang, Libo Liu, Wenbo Li, Rongjin Du, Yuzhou Wang, Yiding Chen, Huijun Le   +6 more
wiley   +1 more source

Towards a synthesis of substorm electrodynamics : HF radar and auroral observations [PDF]

, 2006
At 08:35 UT on 21 November 2004, the onset of an interval of substorm activity was captured in the southern hemisphere by the Far UltraViolet (FUV) instrument on board the IMAGE spacecraft. This was accompanied by the onset of Pi2 activity and subsequent
Tim K. Yeoman (7583066), P. L. Dyson, J. C. Devlin, H. U. Frey, Devlin, J. C., Parkinson, M. L., Lester, M., M. L. Parkinson (7591427), P. L. Dyson (7591430), Grocott, A., Dyson, P. L., M. Lester, M. L. Parkinson, H. U. Frey (7591265), Adrian Grocott (7590026), T. K. Yeoman, A. Grocott, Frey, H. U., Mark Lester (6477935), Yeoman, T. K., J. C. Devlin (7591433)   +20 more
core   +1 more source

First Observation of the Second Harmonic of Upper Band Chorus Waves Linking to Slow Z‐Mode

Geophysical Research Letters, Volume 53, Issue 11, 16 June 2026.
Abstract The Z‐mode, comprising fast and slow branches, is a ubiquitous electromagnetic wave in planetary magnetospheres. While fast Z‐mode generation is attributed to electron cyclotron maser instability, the slow Z‐mode mechanism remains unresolved.
Si Liu, Zhonglei Gao, Yaxiong Zhou, Hongming Yang, Fuliang Xiao, Archie James Johnston, Lixian Yang   +6 more
wiley   +1 more source

Spectral studies of small-scale auroral structure and plasma instability in the high-latitude ionosphere

, 2008
Optical measurements of small-scale auroral structures are here combined with spectrographic data in order to study the relationship between auroral morphology and the energy characteristics of the precipitating population. It is shown that rayed auroral
Sullivan, Joanna Mary
core  

Observed tail current systems associated with bursty bulk flows and auroral streamers during a period of multiple substorms [PDF]

, 2008
We present a multi-instrument study of a substorm bursty bulk flow (BBF) and auroral streamer. During a substorm on 25 August 2003, which was one of a series of substorms that occurred between 00:00 and 05:00 UT, the Cluster spacecraft encountered a BBF ...
A. Kadokura (7591268), R. C. Fear (7591262), S. W. H. Cowley (7590302), Colin Forsyth (7434155), Frey, HU, Reme, H, Lucek, E, I. Dandouras (7591256), Fazakerley, A. N., J. Watermann, Grocott, A, Milan, SE, R. C. Fear, Rème, H., I. Dandouras, Milan, S. E., Lester, M., C. Forsyth, J. F. Watermann (7591277), Grocott, A., M. Lester, A. N. Fazakerley, M. Lester (7589660), A. Kadokura, S. E. Milan, Cowley, S. W. H., A. N. Fazakerley (7591259), E. Lucek, Dandouras, I, Frey, H. U., Watermann, J., Fear, RC, Kadokura, A., S. W. H. Cowley, H. U. Frey, H. Rème, Watermann, J, H. U. Frey (7591265), Adrian Grocott (7590026), Forsyth, C., Lester, M, A. Grocott, Dandouras, I., Fazakerley, AN, E. Lucek (7591271), Lucek, E., H. Rème (7591274), Forsyth, C, Steve E. Milan (7589666), Kadokura, A, Cowley, SWH, Fear, R. C.   +51 more
core   +1 more source

Open Magnetic Field Lines Partition Auroral Oval Segments Into Transpolar Arcs

Geophysical Research Letters, Volume 53, Issue 11, 16 June 2026.
Abstract Transpolar arcs (TPAs) are auroral structures spanning the polar cap. One type appears in conjugate hemispheres and is thought to be located on closed field lines, but how closed flux enters the open polar cap remains debated. We address this using observation and simulation of conjugate TPAs after an interplanetary magnetic field (IMF) By ...
Xin‐Ming Chen, Zan‐Yang Xing, Qing‐He Zhang, Hui‐Gen Yang, L. R. Lyons, K. Oksavik, Yong‐Liang Zhang, S. E. Milan, Xiang‐Yu Wang, Yu‐Zhang Ma, Yong Wang, Lu Sheng, Duan Zhang, Zhi‐Feng Xiu, Bian‐Long Zhao   +14 more
wiley   +1 more source

Simultaneous HF measurements of E- and F-region Doppler velocity at large flow angles [PDF]

, 2004
International audienceData collected by the CUTLASS Finland HF radar are used to illustrate the significant difference between the cosine component of the plasma convection in the F-region and the Doppler velocity of the E-region coherent echoes observed
Koustov, A. V., Makarevitch, R. A., F. Honary, Honary, F., R. A. Makarevitch, A. V. Koustov   +5 more
core   +1 more source

Global Occurrence of Solitary Waves in the Martian Magnetosphere

Geophysical Research Letters, Volume 53, Issue 11, 16 June 2026.
Abstract This letter presents a global occurrence of bipolar solitary waves (SWs) in the Martian magnetosphere. We utilized medium‐frequency electric field measurements from October 2014 to December 2023 from the Mars Atmosphere and Volatile EvolutioN (MAVEN) spacecraft.
Sahil Pandey, Amar Kakad, Bharati Kakad
wiley   +1 more source