Results 111 to 120 of about 103,965 (278)

Climatology of Pi2 Pulsations Deduced From the Wp Index

Journal of Geophysical Research: Space Physics, Volume 130, Issue 12, December 2025.
Abstract We examine the statistical properties of the Pi2 occurrence rate, especially the seasonal and universal‐time (UT) variations by analyzing the Wp index. The Wp index represents the wave power of Pi2 pulsations, and Pi2 events can be identified from the Wp index. We then examine the seasonal and UT variations of the Pi2 occurrence frequency. The
Shin'ya Nakano, Ryuho Kataoka, Masahito Nosé   +2 more
wiley   +1 more source

Phenomenological Evaluation of the Electron Density‐Based Péclet Number of Near‐Earth Solar Wind Turbulence

Journal of Geophysical Research: Space Physics, Volume 130, Issue 12, December 2025.
Abstract The electron density‐based Péclet number has been measured for the first time in the solar wind, alongside a measure of the magnetic Reynolds number. The Péclet number is an important characteristic of energy and particle transport. High Péclet numbers indicate that particle advection dominates diffusion of energy.
T. J. E. Hand, O. W. Roberts, X. Li, Y. Narita, Z. Vörös   +4 more
wiley   +1 more source

Stormtime Magnetospheric Processes Associated With the Dawnside Current Wedge

Journal of Geophysical Research: Space Physics, Volume 130, Issue 12, December 2025.
Abstract The intensification of the westward auroral electrojet (AEJ) in the dawn sector is a characteristic feature of the storm main phase. It is considered an ionospheric segment of a wedge‐type current system, the dawnside current wedge (DCW), formed by the disruption (short‐circuiting through the ionosphere) of a magnetospheric equatorial current.
S. Ohtani, S. Raptis, A. P. Devanandan, T. Motoba, Y. Zou, J. W. Gjerloev, V. G. Merkin   +6 more
wiley   +1 more source

Galactic cosmic rays on extrasolar Earth-like planets I. Cosmic ray flux

, 2015
(abridged abstract) Theoretical arguments indicate that close-in terrestial exoplanets may have weak magnetic fields, especially in the case of planets more massive than Earth (super-Earths).
Atri, D., Grenfell, J. L., Grießmeier, J. -M., Stadelmann, A., Tabataba-Vakili, F.   +4 more
core   +6 more sources

Spontaneous Hot Flow Anomalies in Earth's Foreshock

Journal of Geophysical Research: Space Physics, Volume 130, Issue 12, December 2025.
Abstract In recent years, we have learned that foreshock transients play an influential role in solar wind coupling with Earth's magnetosphere. These transients include spontaneous hot flow anomalies (SHFAs), which are characterized by dips in magnetic field magnitude and ion density, enhanced temperature, decelerated and deflected solar wind flow, and
D. Rojas‐Castillo, X. Blanco‐Cano, P. Kajdič   +2 more
wiley   +1 more source

The high-energy tail of energetic electron precipitation: case studies

Frontiers in Astronomy and Space Sciences
Precipitating plasma sheet, ring current, and radiation belt electrons will affect the ionization level and composition of the neutral atmosphere. Knowledge gaps remain regarding the frequency, intensity, and energy spectrum of the Medium Energy Electron
Hilde Nesse, Josephine Salice
doaj   +1 more source

Signs of Magnetic Accretion in the X-ray Pulsar Binary GX 301-2

, 2012
Observations of the cyclotron resonance scattering feature in the X-ray spectrum of GX 301-2 suggest that the surface field of the neutron star is B_CRSF ~ 4 x 10^{12}G.
Finger, M. H., Ikhsanov, N. R.
core   +2 more sources

Analytical Model of a Toroidal Mode Field Line Resonance and Its Drift‐Resonant Interaction With Energetic Electrons

Journal of Geophysical Research: Space Physics, Volume 130, Issue 12, December 2025.
Abstract Ultra‐low‐frequency (ULF) waves play a critical role in magnetospheric dynamics, yet their transient growth and resonant electron interactions remain poorly understood. We develop a first‐principle model of toroidal mode field line resonances that captures wave growth, saturation, and phase mixing.
J. Liu, R. Rankin, A. W. Degeling, F. Fenrich   +3 more
wiley   +1 more source

MHD Simulations of Magnetospheric Accretion, Ejection and Plasma-field Interaction

, 2013
We review recent axisymmetric and three-dimensional (3D) magnetohydrodynamic (MHD) numerical simulations of magnetospheric accretion, plasma-field interaction and outflows from the disk-magnetosphere boundary.Comment: 11 pages, 8 figures, conference ...
Bachetti, M., Blinova, A. A., Koldoba, A. V., Kurosawa, R., Lii, P. S., Lovelace, R. V. E., Romanova, M. M., Ustyugova, G. V.   +7 more
core   +1 more source

Prediction of the Wave Normal Angle of Proton‐Band EMIC Waves Near Geosynchronous Orbit

Journal of Geophysical Research: Space Physics, Volume 130, Issue 12, December 2025.
Abstract We investigate how the wave normal angle (WNA) and polarization of proton‐band electromagnetic ion cyclotron (EMIC) waves change as they travel from their source to Earth. This paper marks a significant milestone as the first full‐wave simulation of proton‐band EMIC waves reflecting from the ionosphere.
Eun‐Hwa Kim, Khan‐Hyuk Kim, Jay R. Johnson, Peter A. Damiano, Syun'ichi Shiraiwa, Yu Lin, Wesley Martin   +6 more
wiley   +1 more source