Results 61 to 70 of about 2,907 (207)

A quantitative model for cyclotron wave-particle interactions at the plasmapause [PDF]

Annales Geophysicae, 1998
The formation of a zone of energetic electron precipitation by the plasmapause, a region of enhanced plasma density, following energetic particle injection during a magnetic storm, is analyzed.
D. L. Pasmanik, V. Y. Trakhtengerts, A. G. Demekhov, A. A. Lyubchich, E. E. Titova, T. Yahnina, M. J. Rycroft, J. Manninen, T. Turunen   +8 more
doaj   +1 more source

The Dominant Role of the Electron Isotropy Boundary in Controlling Earth's Outer Radiation Belt Electron Lifetimes

Geophysical Research Letters, Volume 53, Issue 3, 16 February 2026.
Abstract Field‐line curvature scattering (FLCS) is believed to be the primary mechanism forming electron isotropy boundaries (IB) and can rapidly scatter relativistic electrons from the outer radiation belt. However, its direct and quantitative impact on controlling outer belt electron lifetimes has never been directly assessed.
Man Hua, Xiaofei Shi, Jacob Bortnik, Anton Artemyev, Vassilis Angelopoulos, Yoshizumi Miyoshi, Takefumi Mitani, James L. Burch, Takeshi Takashima, Tomoaki Hori, Ayako Matsuoka, Mariko Teramoto, Kazuhiro Yamamoto, Yoshiya Kasahara, Fuminori Tsuchiya, Atsushi Kumamoto, Atsuki Shinbori, Iku Shinohara   +17 more
wiley   +1 more source

A Predictive Model of the Position of Plasmapause Based on Lunar Phase and Deep Learning Framework

Geophysical Research Letters
The plasmapause position is crucial for understanding magnetospheric dynamics and space weather forecasting. This study pioneers the integration of lunar phase (LP) into plasmapause modeling using two neural network architectures (BP and fully connected ...
Yajun Li, Chao Xiao, Quanqi Shi, Hongtao Huang, Huizi Wang, Anmin Tian, Die Duan, Ganming Ren, Tao Tang, Yang Lin, Chenghao Li, Jiajia Suo   +11 more
doaj   +1 more source

Guiding of whistler-mode waves with frequencies above one half of the gyrofrequency in the magnetosphere [PDF]

Serbian Astronomical Journal, 1999
Ray-tracing calculations show that a trough, L = 4.6, located in the region outside the plasmapause is capable to guide whistler-mode waves in frequency range 0.5fBmin−0.64fBmin, from one hemisphere to the other.
Šulić D.M.
doaj   +1 more source

Plasmapause Disturbances Synchronized with Magnetospheric Disturbances.

Journal of geomagnetism and geoelectricity, 1996
Quasi pulsive depleting plasma density variations with period ranging from a few to a few tens sec with depletion up to 30 to 50% of the ambient non-depleted plasmapause density have been observed in the occasion of the plasmapause crossing by the Akebono (EXOS-D) satellite, in association with the enhancements of the local upper hybrid mode plasma ...
Akira Morioka, Hiroshi Oya
openaire   +2 more sources

Bursty Precipitation of Relativistic Electrons Unveiled by CIRBE/REPTile‐2 Measurements and Their Physical Implications

AGU Advances, Volume 7, Issue 1, February 2026.
Abstract Energetic electron precipitation plays a pivotal role in shaping Earth's radiation belt dynamics and drives significant physical and chemical changes in the upper atmosphere. However, the detailed mechanisms governing the loss of relativistic electrons have remained unclear, largely due to the limited energy coverage and coarse resolution of ...
Zheng Xiang, Xinlin Li, Daniel N. Baker, Qianli Ma, Yang Mei, Declan O’Brien, Hong Zhao, David Brennan, Theodore Sarris, Yoshizumi Miyoshi, Yoshiya Kasahara, Takefumi Mitani, Takeshi Takashima, Michael A. Temerin   +13 more
wiley   +1 more source

Statistical Characteristics of Electron Precipitation During HSS‐ and ICME‐Driven Storms Observed by the EISCAT Radar

Journal of Geophysical Research: Space Physics, Volume 131, Issue 2, February 2026.
Abstract The 1–100 keV electron precipitation during storm time has been studied by applying the updated ELSPEC inversion method to field‐aligned electron density profiles measured by the EISCAT Tromsø radar at L = 6.5. The statistical properties of peak energy, total energy flux, and total number flux as a function of MLT have been studied for the two
N. M. Ellahouny, A. T. Aikio, I. I. Virtanen, H. Vanhamäki, L. Cai, M. N. Pedersen, H. W. Tesfaw   +6 more
wiley   +1 more source

Global Morphology of Chorus Waves in the Outer Radiation Belt and the Effect of Geomagnetic Activity and fpe ${f}_{pe}$/fce ${f}_{ce}$

Journal of Geophysical Research: Space Physics, Volume 131, Issue 2, February 2026.
Abstract Whistler‐mode chorus waves play a key role in driving radiation belt dynamics by enabling both acceleration of electrons to relativistic energies as well as their loss into the atmosphere via pitch‐angle scattering. The ratio between the electron plasma frequency (fpe ${f}_{pe}$) and the electron gyrofrequency (fce ${f}_{ce}$) significantly ...
K. A. Bunting, N. P. Meredith, J. Bortnik, Q. Ma, R. Matsuura, X.‐C. Shen   +5 more
wiley   +1 more source

Guiding Medium Radio Waves in the Magnetosphere: Features and Geophysical Conditions

Atmosphere
We present experimental results related to the features and geophysical conditions for the occurrence of the long-delay echo (LDE) signals in the medium-wave (MW) frequency range observed on 20 January 2025, at the Gor’kovskaya observatory near St ...
Alexey S. Kalishin, Natalia F. Blagoveshchenskaya, Tatiana D. Borisova, Ivan M. Egorov, Gleb A. Zagorskiy, Anna O. Mingaleva   +5 more
doaj   +1 more source

The Real‐Time Advanced Ionospheric Data Assimilation (AIDA) Model

Space Weather, Volume 24, Issue 2, February 2026.
Abstract The Advanced Ionospheric Data Assimilation (AIDA) is a real‐time data assimilation model of global 3D ionosphere and plasmasphere electron density. Changes in the local space environment can occur on very short timescales, particularly during disturbed geomagnetic conditions.
Benjamin Reid, David R. Themens, Sean Elvidge, Mohammad Afraz Ahmed, Warrick Ball, M. Mainul Hoque   +5 more
wiley   +1 more source