Results 51 to 60 of about 916,158 (245)
The Astrophysical JournalHeliospheric suprathermal ions include inner-source pickup ions, cometary ions, solar energetic particles, and suprathermal tail particles. Despite exhaustive observation and formalisms, their role in interplanetary shock acceleration has yet to be ...
Johann R. Mejia-Ott, Brent M. Randol
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Characteristics of Solar Wind Density Depletions During Solar Cycles 23 and 24 [PDF]
Journal of Astronomy and Space Sciences, 2017 Solar wind density depletions are phenomena that solar wind density is rapidly decreased and keep the state. They are generally believed to be caused by the interplanetary (IP) shocks.
Keunchan Park +4 more
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Editorial to the Special Issue “Propagation of Coronal Mass Ejections”
Universe, 2023 Coronal mass ejections (CMEs) and their associated shocks are one of the main drivers of heliosphere variability, causing both interplanetary and planetary perturbations [...]
Mateja Dumbović, Fang Shen
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On the Formation of Super-Alfvénic Flows Downstream of Collisionless Shocks
The Astrophysical JournalSuper-Alfvénic jets, with kinetic energy densities significantly exceeding that of the solar wind, are commonly generated downstream of Earth's bow shock under both high- and low-beta plasma conditions. In this study, we present theoretical evidence that
Adnane Osmane, Savvas Raptis
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Interplanetary Shocks between 0.3 and 1.0 au: Helios 1 and 2 Observations
The Astrophysical Journal, 2023 The Helios 1 (H1) and Helios 2 (H2) spacecraft measured the solar winds at a distance between ∼0.3 and 1.0 au from the Sun. With increasing heliocentric distance ( r _h ), the plasma speed is found to increase at ∼34–40 km s ^−1 au ^−1 and the density ...
Rajkumar Hajra +5 more
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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
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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
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MHD waves at the pre-front of interplanetary shocks on September 6 and 7, 2017
Solar-Terrestrial PhysicsWe analyze strong space weather disturbances during first ten days of September 2017, using the geomagnetic Dst index, parameters of normals to interplanetary shock fronts, direct measurements of interplanetary magnetic field, solar wind, and cosmic ray ...
Starodubtsev S. A., Shadrina L. P.
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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 ...
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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
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