Results 121 to 130 of about 60,808,388 (219)

Spatial Relationship Between the Midlatitude Ionospheric Trough and Plasmaspheric Plumes

Journal of Geophysical Research: Space Physics, Volume 131, Issue 10, October 2026.
Abstract The plasmasphere, a subsystem of the complex geospace environment, is a torus of cold plasma “frozen” into Earth's magnetic field and sourced from the ionosphere. Plasmaspheric plumes–drainage channels formed during geospace storms–have primarily been observed near the equator.
Balázs Heilig, Lilla Murár‐Juhász, Máté Tomasik   +2 more
wiley   +1 more source

Constraints on Primordial Black Holes from Neff: Scalar-induced Gravitational Waves as an Extra Radiation Component

The Astrophysical Journal
In 2023 June, multiple pulsar timing array collaborations provided evidence for the existence of a stochastic gravitational-wave background. Scalar-induced gravitational waves (SIGWs), as one of the most likely sources of stochastic gravitational waves ...
Jing-Zhi Zhou, Yu-Ting Kuang, Zhe Chang, H. Lü   +3 more
doaj   +1 more source

Statistics of Orientation of Nightside Auroral Arcs and Interplanetary Conditions

Journal of Geophysical Research: Space Physics, Volume 131, Issue 10, October 2026.
Abstract We present statistics and dependence on interplanetary conditions of the orientation of nightside auroral arcs in the equatorward part of the auroral oval. The results related to the arcs essentially represent the orientation and dynamics of the equatorial boundary of the nightside auroral oval.
A. Kozlovsky, M. Myllymaa, R. Lukianova, T. Raita   +3 more
wiley   +1 more source

20. Global cosmological parameters: H0, Ω M,andΛ 1 20. GLOBAL COSMOLOGICAL

, 2008
This review surveys the current status of the determination of the three cosmological parameters, the Hubble constant H0, the mass density parameter ΩM and the cosmological constant Λ.
Parameters H, Ω Λ =λ/h
core  

Inhomogeneity-induced variance of cosmological parameters

, 2012
Context. Modern cosmology relies on the assumption of large-scale isotropy and homogeneity of the Universe. However, locally the Universe is inhomogeneous and anisotropic. This raises the question of how local measurements (at the  ~102 Mpc scale) can be
A. Wiegand, D. J. Schwarz, Schwarz, Dominik ; https://orcid.org/, Wiegand, Alexander   +3 more
core   +1 more source

Faint Diffuse 557.7‐nm Emissions Equatorward of the Auroral Oval: Conjugate Observations by Ground Airglow Imagers and the Arase Satellite

Journal of Geophysical Research: Space Physics, Volume 131, Issue 10, October 2026.
Abstract At subauroral latitudes, discrete auroras, such as strong thermal emission velocity enhancement and stable auroral red arcs, have been extensively studied. On the other hand, diffuse emissions at subauroral latitudes have not been studied well.
M. Gomi, K. Shiokawa, Y. Miyoshi, Y. Otsuka, S. Oyama, M. Connors, A. Shinbori, T. Hori, C.‐W. Jun, K. Yamamoto, I. Shinohara, K. Asamura, S. Kasahara, K. Keika, S. Yokota, F. Tsuchiya, A. Kumamoto, Y. Kasahara, S. Matsuda, Y. Kazama, S.‐Y. Wang, S. W. Y. Tam, T.‐F. Chang, B.‐J. Wang, A. Matsuoka, M. Teramoto   +25 more
wiley   +1 more source

Sensitivity of Cosmological Parameter Estimation to Nonlinear Prescription from Cosmic Shear

The Astrophysical Journal
Several ongoing and upcoming large-scale structure surveys aim to explore the nonlinear regime of structure formation with high precision. Making reliable cosmological inferences from these observations necessitates precise theoretical modeling of the ...
Sarah Safi, Marzieh Farhang
doaj   +1 more source

Propagation Dynamics of Fast Electron Beam and Its Electron Cyclotron Maser Emission

Journal of Geophysical Research: Space Physics, Volume 131, Issue 10, October 2026.
Abstract Fast electron beams (FEBs) and coherent radio bursts both are very common plasma activity phenomena in the cosmos. The electron cyclotron maser (ECM) instability driven by FEBs trapped in magnetic fields can directly amplify radio wave radiations.
Ling Chen, Dejin Wu, Jianfei Tang, Guoqing Zhao   +3 more
wiley   +1 more source

A Time‐Continuous Model of the 3D Ionospheric Current System and Associated Magnetic Fields in the Diurnal Variation Band

Journal of Geophysical Research: Space Physics, Volume 131, Issue 10, October 2026.
Abstract Ionospheric currents and their associated magnetic perturbations are difficult to predict due to the high variability of their driving mechanisms. In addition, the 3D structure of the currents is challenging to unravel due to the lack of direct observations within the current flow region, particularly in the E $E$‐layer.
P. Alken, G. D. Egbert, A. Maute, A. D. Richmond, G. Lu, K. Pham, M. Fillion   +6 more
wiley   +1 more source

OI 630 nm Airglow Observed From Space as a Diagnostic of Nighttime Low‐Latitude Ionospheric Dynamics

Journal of Geophysical Research: Space Physics, Volume 131, Issue 10, October 2026.
Abstract This study investigates the nighttime morphology of the bottomside F region (∼250 km) at low latitudes using 630 nm airglow measurements from the Visible and Infrared Spectral Imager (VISI) aboard the Ionosphere, Mesosphere, Upper Atmosphere, and Plasmasphere (IMAP) mission on the International Space Station. For this purpose, we analyzed IMAP/
Hyosub Kil, Se‐Heon Jeong, Jeong‐Heon Kim, Woo Kyoung Lee, Young‐Sil Kwak, Akinori Saito, Takeshi Sakanoi   +6 more
wiley   +1 more source