Results 21 to 30 of about 18,045 (247)

A statistical study of EMIC waves observed by Cluster: 1. Wave properties [PDF]

Journal of Geophysical Research: Space Physics, 2015
AbstractElectromagnetic ion cyclotron (EMIC) waves are an important mechanism for particle energization and losses inside the magnetosphere. In order to better understand the effects of these waves on particle dynamics, detailed information about the occurrence rate, wave power, ellipticity, normal angle, energy propagation angle distributions, and ...
R. C. Allen, J.‐C. Zhang, L. M. Kistler, H. E. Spence, R.‐L. Lin, B. Klecker, M. W. Dunlop, M. André, V. K. Jordanova   +8 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 wave packets: ducted propagation and reflected waves

Frontiers in Astronomy and Space Sciences, 2023
Electromagnetic ion cyclotron (EMIC) waves can scatter radiation belt electrons with energies of a few hundred keV and higher. To accurately predict this scattering and the resulting precipitation of these relativistic electrons on short time scales, we ...
Miroslav Hanzelka, Miroslav Hanzelka, Wen Li, Qianli Ma, Qianli Ma, Murong Qin, Xiao-Chen Shen, Luisa Capannolo, Longzhi Gan   +8 more
doaj   +2 more sources

Observational Properties of Harmonic EMIC Waves: Statistical Study

Geophysical Research Letters
Electromagnetic ion cyclotron (EMIC) waves are discrete electromagnetic emissions separated by multiple ion gyrofrequencies. Harmonic EMIC waves are defined as waves with a strong electric or magnetic field (or both) at the harmonics of the fundamental ...
Shujie Gu, Xu Liu, Lunjin Chen, M. E. Usanova, Wenyao Gu, Zhiyang Xia   +5 more
doaj   +3 more sources

Physical mechanisms of compressional EMIC wave growth [PDF]

Journal of Geophysical Research: Space Physics, 2010
On 29 June 2007, electromagnetic ion cyclotron (EMIC) waves were observed on the ground by the Canadian Array for Realtime Investigations of Magnetic Activity (CARISMA) network of magnetometers between L = 4 and L = 6 in response to a significant magnetospheric compression.
J. P. McCollough, S. R. Elkington, Maria Usanova, I. R. Mann, D. N. Baker, Z. C. Kale   +5 more
openalex   +3 more sources

Observations of coincident EMIC wave activity and dusk-side energetic electron precipitation on 18-19 January 2013 [PDF]

Geophysical Research Letters, 2015
Electromagnetic ion cyclotron (EMIC) waves have been suggested to be a cause of radiation belt electron loss to the atmosphere. Here simultaneous, magnetically conjugate measurements are presented of EMIC wave activity, measured at geosynchronous orbit ...
A. Halford, Anderson, Anderson, Blum, Blum, Bortnik, Carson, Chen, Clilverd, Comess, Cornwall, Cornwall, Denton, Engebretson, Erlandson, Foat, G. Reeves, Gendrin, Goldstein, Goldstein, H. Singer, Halford, Halford, Imhof, J. Goldstein, J. W. Bonnell, Jordanova, Jordanova, Keika, L. W. Blum, Li, Li, Lorentzen, Lyons, M. Clilverd, M. Engebretson, M. Ohnsted, M. Usanova, Mann, McCollough, McCollough, Meredith, Millan, Millan, Millan, Min, Miyoshi, Nakamura, Olson, R. Millan, Sandanger, Soria-Santacruz, Summers, Thorne, Tsyganenko, Ukhorskiy, Usanova, Vampola, Wang, Woodger, X. Li   +60 more
core   +3 more sources

Relativistic Electron Precipitation by EMIC Waves: Importance of Nonlinear Resonant Effects

Geophysical Research Letters, 2022
Relativistic electron losses in Earth's radiation belts are usually attributed to electron resonant scattering by electromagnetic waves. One of the most important wave modes for such scattering is the electromagnetic ion cyclotron (EMIC) mode. Within the
Veronika S. Grach, Anton V. Artemyev, Andrei G. Demekhov, Xiao‐Jia Zhang, Jacob Bortnik, Vassilis Angelopoulos, Rumi Nakamura, Ethan Tsai, Colin Wilkins, Owen W. Roberts   +9 more
doaj   +3 more sources

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

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

Propagation of EMIC Waves From Shabansky Orbits in the Dayside Magnetosphere [PDF]

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

EMIC wave parameterization in the long‐term VERB code simulation [PDF]

Journal of Geophysical Research: Space Physics, 2017
AbstractElectromagnetic ion cyclotron (EMIC) waves play an important role in the dynamics of ultrarelativistic electron population in the radiation belts. However, as EMIC waves are very sporadic, developing a parameterization of such wave properties is a challenging task.
A. Y. Drozdov, Y. Y. Shprits, M. E. Usanova, N. A. Aseev, A. C. Kellerman, H. Zhu   +5 more
openaire   +6 more sources