Results 31 to 40 of about 2,661,724 (245)

Arase In Situ Observations of High‐Frequency Electromagnetic Ion Cyclotron (EMIC) Waves in Regions Close to the Earth During the May 2024 Storm

Geophysical Research Letters
During the May 2024 storm, the minimum Dst index was approximately −412 nT, marking the largest geomagnetic storm of the past decade. This event caused the inner edge of the ring current to penetrate deeply into the inner magnetosphere during the main ...
C.‐W. Jun, Y. Miyoshi, T. Hori, N. Kitamura, K.‐H. Kim, J.‐H. Lee, J. Bortnik, L. Lyons, I. Shinohara, A. Matsuoka, Y. Kasahara, S. Matsuda, Y. Kasaba, M. Teramoto, K. Yamamoto, A. Shinbori   +15 more
doaj   +2 more sources

Propagation of EMIC Waves From Shabansky Orbits in the Dayside Magnetosphere

Geophysical Research Letters
We explore the characteristics of EMIC waves generated in a non‐dipole, compressed magnetic field at the minimum of the magnetic field. We conducted 2D full‐wave simulations using the Petra‐M code, focusing on a compressed magnetic field in the outer ...
Eun‐Hwa Kim, Syun'ichi Shiraiwa, Jay R. Johnson, Nicola Bertelli, Sarah K. Vines, Khan‐Hyuk Kim, Mark Engebretson, Hyomin Kim, Carson O'ffill   +8 more
doaj   +2 more sources

A Survey of EMIC Waves in Van Allen Probe Data

Journal of Geophysical Research: Space Physics
AbstractUsing an automated novel approach we conduct a reproducible systematic survey of electromagnetic ion cyclotron wave activity detected by Van Allen Probe B during the time period 2013 January 1–2019 July 15. We identify approximately 500 hr of EMIC wave activity, an occurrence rate of ∼ 0.85%.
Andrew Inglis, Kyle Robert Murphy, Alexa J. Halford   +2 more
openaire   +2 more sources

A Triggering Process for Nonlinear EMIC Waves Driven by the Compression of the Dayside Magnetosphere

Geophysical Research Letters
Using the Arase and Van Allen Probes satellite observations, we investigate the nonlinear electromagnetic ion cyclotron (EMIC) rising‐tone (RT) emissions with an increase of the solar wind dynamic pressure in the dayside magnetosphere.
C.‐W. Jun, Y. Miyoshi, S. Nakamura, M. Shoji, T. Hori, J. Bortnik, L. Lyons, I. Shinohara, A. Matsuoka   +8 more
doaj   +2 more sources

In Situ Observations of the Influence of Nonlinear EMIC Waves on Relativistic Electrons in the Outer Radiation Belt

Geophysical Research Letters
This study demonstrates the influence of electromagnetic ion cyclotron (EMIC) rising‐tone emissions on relativistic electrons in the inner magnetosphere using data obtained from the Van Allen Probes and Arase satellites.
Chae‐Woo Jun, Yoshizumi Miyoshi, Tomoaki Hori, Jacob Bortnik, Larry Lyons, Khan‐Hyuk Kim, Takefumi Mitani, Takeshi Takashima, Iku Shinohara, Nana Higashio, Ayako Matsuoka, Kazuhiro Yamamoto, Mariko Teramoto   +12 more
doaj   +2 more sources

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

Electron Precipitation Driven by EMIC Waves: Two Types of Energy Dispersion

Geophysical Research Letters
Electromagnetic ion cyclotron (EMIC) waves can very rapidly and effectively scatter relativistic electrons into the atmosphere. EMIC‐driven precipitation bursts can be detected by low‐altitude spacecraft, and analysis of the fine structure of such bursts
Veronika S. Grach, Anton V. Artemyev, Andrei G. Demekhov, Xiao‐Jia Zhang, Jacob Bortnik, Vassilis Angelopoulos   +5 more
doaj   +2 more sources

The nonlinear coupling of electromagnetic ion cyclotron and lower hybrid waves in the ring current region: the magnetic storm 1-7May 1998 [PDF]

Nonlinear Processes in Geophysics, 2004
The excitation of lower hybrid waves (LHWs) is a widely discussed mechanism of interaction between plasma species in space, and is one of the unresolved questions of magnetospheric multi-ion plasmas. In this paper we present the morphology, dynamics, and
G. V. Khazanov, E. N. Krivorutsky, K. V. Gamayunov, L. A. Avanov, L. A. Avanov   +4 more
doaj   +3 more sources

Saturation Characteristics of Multi‐Band EMIC Waves in the Inner Magnetosphere and Observational Evidence for the Second Saturation Process

Geophysical Research Letters
The wave amplitude is vital for quantifying the impact of electromagnetic ion cyclotron (EMIC) waves on inner magnetospheric dynamics. Previous numerical studies mainly focused on the evolution of total wave energy/amplitude, whose maximum is usually ...
Zuxiang Xue, Zhigang Yuan, Dan Deng, Xiongdong Yu   +3 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