Results 71 to 80 of about 5,320 (271)

Spatio-temporal structure of a poloidal Alfvén wave detected by Cluster adjacent to the dayside plasmapause [PDF]

Annales Geophysicae, 2008
A case study of a poloidal ULF pulsation near the dayside plasmapause is presented based on Cluster observations of magnetic and electric fields. The pulsation is detected close to the magnetic equatorial plane at L shells L=[4.4, 4.6] and oscillates
S. Schäfer, K. H. Glassmeier, P. T. I. Eriksson, P. N. Mager, V. Pierrard, K. H. Fornaçon, L. G. Blomberg   +6 more
doaj   +1 more source

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

Plasmapause undulation of 17 April 2002

Geophysical Research Letters, 2004
We report IMAGE EUV observations of a striking undulatory motion of the plasmapause that occurred on 17 April 2002, in which a large ripple propagated westward across the duskside plasmapause. From the plasmapause motion we infer a peak E‐field of ≈3 mV/m associated with the undulation, and estimate the undulation's equatorial azimuthal speed to be 0.9
J. Goldstein, B. R. Sandel, M. R. Hairston, S. B. Mende   +3 more
openaire   +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

Multi‐Species Energy‐Banded Ions in the Ionosphere During the 21 January 2005 Magnetic Storm: Low‐Altitude Edge of the Warm Plasma Cloak

Journal of Geophysical Research: Space Physics, Volume 131, Issue 1, January 2026.
Abstract During the 21–22 January 2005 magnetic storm, the FAST satellite observed warm (< few keV) ions in discrete energy bands on the dayside at ∼3,000 km altitude for more than 6.5 hr. We suggest that the ionospheric energy‐banded ions represent the low‐altitude edge of the warm plasma cloak observed simultaneously by magnetospheric satellites ...
J. U. Kozyra, M. W. Liemohn, C. A. Cattell, J. Dombeck, C. P. Escoubet, M. Thomsen, G. Lu, D. J. Knipp, L. J. Paxton, R. M. Skoug, H. A. Elliott, A. J. Davis, L. Rastaetter, D. DeZeeuw, C. Colpitts   +14 more
wiley   +1 more source

A very bright SAR arc: implications for extreme magnetosphere-ionosphere coupling [PDF]

Annales Geophysicae, 2007
In contrast to the polar aurora visible during geomagnetic storms, stable auroral red (SAR) arcs offer a sub-visual manifestation of direct magnetosphere-ionosphere (M-I) coupling at midlatitudes.
J. Baumgardner, J. Wroten, J. Semeter, J. Kozyra, M. Buonsanto, P. Erickson, M. Mendillo   +6 more
doaj   +1 more source

A Wave Model and Diffusion Coefficients for Plasmaspheric Hiss Parameterized by Plasmapause Location

Journal of Geophysical Research: Space Physics, 2019
The scattering of electrons via plasmaspheric hiss whistler‐mode plasma waves has profound consequences for the dynamics of electrons in the inner terrestrial magnetosphere, including the radiation belts. Consequently, simulations of inner magnetospheric
D. Malaspina, Hui Zhu, A. Drozdov
semanticscholar   +1 more source

Outer Radiation Belt Dynamics During the October 2012 Storm Revisited: Rapid Inward Radial Transport From a Dynamic Outer Boundary

Journal of Geophysical Research: Space Physics, Volume 131, Issue 1, January 2026.
Abstract Earth's outer radiation belt electron flux is highly variable and can be enhanced by over an order of magnitude over timescales less than one day, as observed during the October 2012 storm. Previous studies of this storm (e.g., Reeves et al., 2013, https://doi.org/10.1126/science.1237743) have invoked local acceleration to explain this ...
L. G. Ozeke, I. R. Mann, L. Olifer, S. K. Morley, H. E. Spence   +4 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

Derivation of Ambient Electron Density Using Spacecraft Potential Measurements From the MMS and Van Allen Satellites: Application to the Plasmasphere

Journal of Geophysical Research: Space Physics, Volume 131, Issue 1, January 2026.
Abstract We investigate the empirical relationship between the spacecraft potential (Vs) measured by the Electric Field Double Probes, and the electron density (Ne) measured by the Fast Plasma Instrument on the MMS spacecraft. We derive their relationship during fast‐mode intervals when the Active Spacecraft Potential Control Devices are off.
H. Laakso, G. Le, R. Pfaff, S. Boardsen, K. Nykyri   +4 more
wiley   +1 more source