Results 41 to 50 of about 1,109 (199)
Mercury’s Bow Shock and Magnetopause Variations According to MESSENGER Data
UniverseUsing data from the MESSENGER spacecraft magnetometer that describes the magnetopause and the bow shock crossing points of the Mercury’s magnetosphere, we have calculated the parameters of the paraboloids of revolution approximating the obtained points ...
Dmitry Nevsky +2 more
doaj +1 more source
Steady Collapse of Uranus' Exosphere After 1998 to the Present Decade
Geophysical Research Letters, Volume 53, Issue 6, 28 March 2026.Abstract Uranus' thermospheric temperature decreased from ∼800K in 1986 to ∼450K in 2022 as determined from observations of H3+ and H2 infrared emissions. Spitzer 2007 lower atmosphere observations do not emulate this cooling trend. Here we show that the atomic H Lyman ⍺ emission from the disk of Uranus observed by HST from 2011 to 2022 are not ...
D. Bhattacharyya +6 more
wiley +1 more source
A case study of large-amplitude ULF waves in the Martian foreshock
Earth and Planetary Physics, 2020 Foreshock ultralow frequency (ULF) waves constitute a significant physical phenomenon in the plasma environment of terrestrial planets. The occurrence of these waves, associated with backstreaming particles reflected and accelerated at the bow shock ...
LiCan Shan, YaSong Ge, AiMin Du
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Ion‐Acoustic Waves Associated With Interplanetary Shocks
Geophysical Research LettersAbstractIon‐acoustic waves (IAWs) commonly occur near interplanetary (IP) shocks. These waves are important because of their potential role in the dissipation required for collisionless shocks to exist. We study IAW occurrence statistically at different heliocentric distances using Solar Orbiter to identify the processes responsible for IAW generation ...
J. J. Boldú +12 more
openaire +6 more sources
Low Density Drivers of Strong Interplanetary Shocks [PDF]
International Astronomical Union Colloquium, 1996 AbstractThe theory that most, if not all, interplanetary shocks are caused by coronal mass ejections (CMEs) faces serious problems in accounting for the strongest shocks. The difficulties include (i) a remarkable absence of very strong shocks during solar maximum 1980 when CMEs were prolific, (ii) unrealistic initial speeds near the Sun for impulsive ...
openaire +1 more source
Mirror Mode Mediated EMIC Wave Generation in the Magnetosheath
Geophysical Research Letters, Volume 53, Issue 6, 28 March 2026.Abstract Electromagnetic ion cyclotron (EMIC) waves and mirror modes (MMs), both driven by ion temperature anisotropy, are commonly observed in planetary magnetosheaths. Conventional explanations for their co‐occurrence are largely based on linear instability theory in proton–electron plasmas, which requires comparable growth rates for the EMIC and MM ...
Yifan Wu +5 more
wiley +1 more source
Fractal Dimension Analysis of Earth Magnetic Field during 26 August 2018 Geomagnetic Storm
Entropy, 2022 We analyse the fractal nature of geomagnetic field northward and eastward horizontal components with 1 min resolution measured by the four stations Belsk, Hel, Sodankylä and Hornsund during the period of 22 August–1 September, when the 26 August 2018 ...
Anna Wawrzaszek +4 more
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Surface Air Enrichment of Cosmogenic 35S at a Subtropical Site During the May 2024 Solar Superstorm
Geophysical Research Letters, Volume 53, Issue 5, 16 March 2026.Abstract Cosmogenic radiosulfur (35S) is produced in the atmosphere by high‐energy particle interactions and serves as a sensitive tracer of stratospheric intrusions. In May 2024, an extreme solar storm provided a rare opportunity to examine atmospheric 35S responses to intense solar activity.
Xinling Zou +4 more
wiley +1 more source
Surface‐Driven Protocell Formation in Geologically Relevant Early Earth Environment
ChemSystemsChem, Volume 8, Issue 2, March 2026.Illustration of a prebiotic early‐Earth environment showing cell‐like protocells (blue spheres) and other complex organic molecules (pink and green spheres) distributed across terrestrial surfaces and within subsurface niches. Volcanic landscapes and mineral‐rich substrates provide diverse geochemical settings for the assembly and evolution of ...
Pamela Knoll, Silvia Holler
wiley +1 more source
Electron dropout echoes induced by interplanetary shock: Van Allen Probes observations
Geophysical Research Letters, 2016 On 23 November 2012, a sudden dropout of the relativistic electron flux was observed after an interplanetary shock arrival. The dropout peaks at ∼1 MeV and more than 80% of the electrons disappeared from the drift shell.
Y. X. Hao +10 more
doaj +1 more source