Results 11 to 20 of about 1,145 (204)

Multi‐Ion Oscillitons—Origin of Coherent Magnetospheric EMIC Waves

Journal of Geophysical Research: Space Physics, 2022
Abstract The recent spacecraft observations by MMS and Van Allen Probes associated with electromagnetic ion cyclotron (EMIC) waves in the Earth magnetosphere emphasize the important role of multi‐ion plasma composition for generation and characteristics of these emissions.
Sauer, Konrad, Dubinin, Eduard, Dubinin, Eduard; 1 Max‐Planck Institute of Solar System Research Göttingen Germany   +2 more
openaire   +4 more sources

Discovery of proton hill in the phase space during interactions between ions and electromagnetic ion cyclotron waves [PDF]

Scientific Reports, 2021
A study using Arase data gives the first observational evidence that the frequency drift of electromagnetic ion cyclotron (EMIC) waves is caused by cyclotron trapping.
Masafumi Shoji, Yoshizumi Miyoshi, Lynn M. Kistler, Kazushi Asamura, Ayako Matsuoka, Yasumasa Kasaba, Shoya Matsuda, Yoshiya Kasahara, Iku Shinohara   +8 more
doaj   +2 more sources

Full‐wave modeling of EMIC waves near the He+ gyrofrequency [PDF]

Geophysical Research Letters, 2016
Electromagnetic ion cyclotron (EMIC) waves are known to be excited by the cyclotron instability associated with hot and anisotropic ion distributions in the equatorial region of the magnetosphere and are thought to play a key role in radiation belt ...
Eun‐Hwa Kim, Jay R. Johnson
doaj   +2 more sources

Sub‐MeV Electron Precipitation Driven by EMIC Waves: New Insights From CIRBE/REPTile‐2 Measurements

Geophysical Research Letters
Electromagnetic ion cyclotron (EMIC) waves are recognized as a key driver of relativistic (>1 MeV) electron loss in Earth's magnetosphere. Growing evidence also suggests that EMIC wave can efficiently scatter sub‐MeV electrons, although the precise ...
Zheng Xiang, Xinlin Li, Daniel N. Baker, Declan O’Brien, Yang Mei, Ziye Zhang, Theodore Sarris, Michael A. Temerin   +7 more
doaj   +2 more sources

EMIC waves and plasmaspheric and plume density: CRRES results [PDF]

Journal of Geophysical Research: Space Physics, 2015
Abstract Electromagnetic ion cyclotron (EMIC) waves frequently occur during geomagnetic storms, specifically during the main phase and 3–6 days following the minimum S y m − H value.
A J Halford, B J Fraser, S K Morley
exaly   +2 more sources

Precipitation of Radiation Belt Electrons by EMIC Waves With Conjugated Observations of NOAA and Van Allen Satellites

Geophysical Research Letters, 2018
In this letter, we present unique conjugated satellite observations of MeV relativistic electron precipitation caused by electromagnetic ion cyclotron (EMIC) waves. On the outer boundary of the plasmasphere, the Van Allen probe observed EMIC waves.
Zhigang Yuan, Kun Liu, Xiongdong Yu, Fei Yao, Shiyong Huang, Dedong Wang, Zhihai Ouyang   +6 more
doaj   +2 more sources

Excitation of O+ Band EMIC Waves Through H+ Ring Velocity Distributions: Van Allen Probe Observations

Geophysical Research Letters, 2018
A typical case of electromagnetic ion cyclotron (EMIC) emissions with both He+ band and O+ band waves was observed by Van Allen Probe A on 14 July 2014.
Xiongdong Yu, Zhigang Yuan, Shiyong Huang, Fei Yao, Dedong Wang, Herbert O. Funsten, John R. Wygant   +6 more
doaj   +2 more sources

Mirror Mode Mediated EMIC Wave Generation in the Magnetosheath

Geophysical Research Letters
Electromagnetic ion cyclotron (EMIC) waves and mirror modes (MMs), both driven by ion temperature anisotropy, are commonly observed in planetary magnetosheaths.
Yifan Wu, Chen Shi, Xiaoman Liu, Lei Dai, Jinsong Zhao, Xin Tao   +5 more
doaj   +2 more sources

On the Impacts of Ions of Ionospheric Origin and Their Composition on Magnetospheric EMIC Waves [PDF]

Frontiers in Astronomy and Space Sciences, 2021
Large numbers of theory and observation studies have been conducted on electromagnetic ion cyclotron (EMIC) waves occurring in Earth’s magnetosphere.
Justin H. Lee, Lauren W. Blum, Lunjin Chen   +2 more
doaj   +2 more sources

Unusual high frequency EMIC waves: Detailed analysis of EMIC wave excitation and energy coupling between EMIC and magnetosonic waves

Advances in Space Research, 2022
Abstract A recent event study suggested a coupling process whereby suprathermal protons (10–100 eV), as a result of perpendicular heating by pre-existing magnetosonic waves, can excite electromagnetic ion cyclotron (EMIC) waves with frequency near the local proton cyclotron frequency ( f ~ 0.95 f cp ).
Kyungguk Min, Jiwoo Kim, Qianli Ma, Chae-Woo Jun, Kaijun Liu   +4 more
openaire   +1 more source