Results 31 to 40 of about 18,045 (247)

Study of EMIC wave excitation using direct ion measurements [PDF]

Journal of Geophysical Research: Space Physics, 2015
With data from Van Allen Probes, we investigate electromagnetic ion cyclotron (EMIC) wave excitation using simultaneously observed ion distributions. Strong He band waves occurred while the spacecraft was moving through an enhanced density region.
Bonnell, J., Breneman, Aaron W., Denton, Richard E., Funsten, H. O., Jahn, Joerg-Micha, Kletzing, C A., Kurth, W. S., Larsen, B. A., Liu, Kaijun, Min, Kyungguk, Reeves, Geoffrey, Spence, Harlan E., Wygant, J. R.   +12 more
core   +5 more sources

EMIC waves observed by Cluster near the plasmapause

Journal of Geophysical Research: Space Physics, 2013
AbstractWe analyze a long‐duration electromagnetic ion cyclotron (EMIC) wave event seen in the inner magnetosphere in order to understand the propagation characteristics of these waves in the vicinity of the plasmapause. The study takes advantage of the south to north orbit of the four‐satellite Cluster constellation as it passed through perigee at L ~ 
Y. H. Liu, B. J. Fraser, F. W. Menk
openalex   +3 more sources

Global distribution of EMIC waves derived from THEMIS observations [PDF]

Journal of Geophysical Research: Space Physics, 2012
Electromagnetic ion cyclotron (EMIC) waves play an important role in magnetospheric dynamics and their global distribution has been of great interest. This paper presents the distribution of EMIC waves over a broader range than ever before, as enabled by observations with the Time History of Events and Macroscale Interactions during Substorms (THEMIS ...
Kyungguk Min, Jeongwoo Lee, Kunihiro Keika, Wen Li   +3 more
openaire   +3 more sources

Beam effect on electromagnetic ion-cyclotron waves with general loss – cone distribution function in an anisotropic plasma-particle aspect analysis [PDF]

Annales Geophysicae, 2007
The effect of upgoing ion beam and temperature anisotropy on the dispersion relation, growth rate, parallel and perpendicular resonant energies, and marginal instability of the electromagnetic ion cyclotron (EMIC) waves, with general loss-cone ...
G. Ahirwar, P. Varma, M. S. Tiwari
doaj   +4 more sources

Van Allen probes, NOAA, GOES, and ground observations of an intense EMIC wave event extending over 12 h in magnetic local time [PDF]

Journal of Geophysical Research: Space Physics, 2015
Although most studies of the effects of EMIC waves on Earth's outer radiation belt have focused on events in the afternoon sector in the outer plasmasphere or plume region, strong magnetospheric compressions provide an additional stimulus for EMIC wave ...
Baker, D. N., Engebretson, M. J., Gkioulidou, M., Horne, R. B., Huang, C.-L., Kletzing, C. A., Lessard, M. R., Mann, I. R., Oksavik, K., Omura, Y., Posch, J. L., Raita, T ., Reeves, G. D., Shiokawa, K., Singer, H. J., Smith, C. W., Spence, H. E., Wygant, J. R.   +17 more
core   +3 more sources

Modeling the EMIC Wave‐Induced Acceleration of Energetic Protons in the Io Footprint Tail

Geophysical Research Letters, Volume 53, Issue 5, 16 March 2026.
Abstract The Io footprint tail (FPT) region is crucial for studying the interactions between Io and Jupiter's magnetosphere. In this region, Juno spacecraft observed significant acceleration of energetic protons, concurrently with electromagnetic ion cyclotron (EMIC) waves below the proton gyro‐frequency.
Peng Lu, Xing Cao, Xudong Gu, Binbin Ni, Wei Xu, Shaobei Wang, Minyi Long   +6 more
wiley   +2 more sources

Persistent EMIC Wave Activity Across the Nightside Inner Magnetosphere

Geophysical Research Letters, 2020
AbstractElectromagnetic ion cyclotron (EMIC) waves can act as a loss process for both ring current ions and radiation belt electrons, and the spatial and temporal characteristics of these waves are important for quantifying their effects on energetic particles.
L. W. Blum, B. Remya, M. H. Denton, Q. Schiller   +3 more
openaire   +3 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

Multi‐Ion Oscillitons—Origin of Coherent Magnetospheric EMIC Waves

Journal of Geophysical Research: Space Physics, 2022
AbstractThe 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. We show that main properties of the coherent EMIC waves can be explained with the
Sauer, Konrad, Dubinin, Eduard, Dubinin, Eduard; 1 Max‐Planck Institute of Solar System Research Göttingen Germany   +2 more
openaire   +4 more sources

Nonlinear Interaction Between H+ Band and He+ Band EMIC Waves: Van Allen Probe Observations and Hybrid Simulations

Geophysical Research Letters, 2022
Nonlinear theory has predicted that wave‐wave coupling from different band electromagnetic ion cyclotron (EMIC) waves can occur in multiple‐ion plasmas. However, no direct observational evidence has been reported yet.
Dan Deng, Zhigang Yuan, Zuxiang Xue, Shiyong Huang, Zheng Huang, Xiongdong Yu   +5 more
doaj   +1 more source