Results 51 to 60 of about 606 (259)

Sporadic E-like Topside Layer Driven by Wind Shear in the Martian Ionosphere

The Astrophysical Journal
Ionospheric plasma density disturbances significantly affect radio wave propagation, impacting communication and planetary exploration. At Earth, sporadic E layers (Es) are commonly observed. They are characterized by thin, high-density plasma structures
Rong Tian, Chunhua Jiang, Christopher Michael Fowler, Beatriz Sánchez-Cano, Glyn Collinson, David J. Andrews, Wenjie Yin, Guobin Yang, Tongxin Liu, Chongzhe Lao, Yaogai Hu   +10 more
doaj   +1 more source

Electron Energization by Dispersive Alfvén Waves in the Cusp

Geophysical Research Letters, Volume 52, Issue 19, 16 October 2025.
Abstract The propagation of kinetic Alfvén waves (assumed sourced from intermittent dayside reconnection) is investigated with a gyrofluid‐kinetic electron model compared with Cluster observations. These observations reveal electron distributions that are preferentially field‐aligned or field‐opposed, with signatures that are unidirectional or ...
P. A. Damiano, A. J. Hull, C. C. Chaston, J. R. Johnson, Y. Lin   +4 more
wiley   +1 more source

Direct Kelvin‐Helmholtz Instability Detection at the Ionospheric E Region Electron Density

Geophysical Research Letters, Volume 52, Issue 19, 16 October 2025.
Abstract New high‐resolution measurements by Sanya incoherent scatter radar (ISR) employing a wide‐bandwidth chirp signal now enable spatiotemporal resolutions of 37.5 m and 50 s. We have applied these new capabilities for observations of Kelvin‐Helmholtz instability (KHI) dynamics in the low‐latitude ionosphere E region.
Junyi Wang, Xinan Yue, Yihui Cai, Feng Ding, Xu Zhou, Jorge L. Chau, David C. Fritts, Juha Vierinen, Alan Z. Liu   +8 more
wiley   +1 more source

Effects of the 2007 Martian Global Dust Storm on Boundary Positions in the Induced Magnetosphere

The Planetary Science Journal
Mars's magnetosphere is a sensitive system, varying due to external and internal factors, such as solar wind conditions and crustal magnetic fields.
Catherine E. Regan, Andrew J. Coates, Mark Lester, Anne Wellbrock, Geraint H. Jones, Beatriz Sánchez-Cano, Philippe Garnier, Richard P. Haythornthwaite, Dikshita Meggi, Rudy A. Frahm, Mats Holmström   +10 more
doaj   +1 more source

The Possible Role of Penning Ionization Processes in Planetary Atmospheres

Atmosphere, 2015
In this paper we suggest Penning ionization as an important route of formation for ionic species in upper planetary atmospheres. Our goal is to provide relevant tools to researchers working on kinetic models of atmospheric interest, in order to include ...
Stefano Falcinelli, Fernando Pirani, Franco Vecchiocattivi   +2 more
doaj   +1 more source

Extra Zebra Stripes Observed by Macao Science Satellite‐1 in the Inner Radiation Belt

Geophysical Research Letters, Volume 52, Issue 19, 16 October 2025.
Abstract Zebra stripes, characterized by periodic banded structures in the energy‐L shell spectra of energetic electrons in the Earth's inner radiation belt, are understood to result from the azimuthal drift of electrons perturbed by prompt electric field perturbations.
Ziyang Wang, Ying Liu, Qiugang Zong, Yixin Sun, Hong Zou, Yuguang Ye, Xuzhi Zhou   +6 more
wiley   +1 more source

Frequency Characteristics of Magnetosonic Waves Driven by Hot Ring-Beam Protons

The Astrophysical Journal
Magnetosonic (MS) waves can be generated by energetic ring-beam protons, appearing as harmonics near the local proton cyclotron frequency, in the planetary ionospheres/magnetospheres.
Amrutha, S. V. Singh, K. C. Barik, G. S. Lakhina   +3 more
doaj   +1 more source

Whistler Chorus Amplification in the Magnetosphere: The Nonlinear Free‐Electron Laser Model and the Ginzburg‐Landau Equation

Geophysical Research Letters, Volume 52, Issue 19, 16 October 2025.
Abstract We present a novel nonlinear model for whistler‐mode chorus amplification based on the free‐electron laser (FEL) mechanism. First, we derive the nonlinear collective variable equations for the whistler‐electron interaction. Consistent with in situ satellite observations, these equations predict that a small seed wave can undergo exponential ...
Brandon Bonham, Amitava Bhattacharjee
wiley   +1 more source

EUV-dependence of Venusian dayside ionopause altitude: VEX and PVO observations

Earth and Planetary Physics, 2020
The Venusian dayside ionosphere, similar to other planetary ionospheres, is produced primarily by ionization of its neutral upper atmosphere due to solar extreme ultraviolet (EUV) radiation. It has become clear that the expansion of the ionosphere may be
QianQian Han, Markus Fraenz, Yong Wei, Eduard Dubinin, Jun Cui, LiHui Chai, ZhaoJin Rong, WeiXing Wan, Yoshifumi Futaana   +8 more
doaj   +1 more source

Magnetic Field and Plasma Asymmetries Between the Martian Quasi‐Perpendicular and Quasi‐Parallel Magnetosheaths

Geophysical Research Letters, Volume 52, Issue 19, 16 October 2025.
Abstract The Martian magnetosheath acts as a conduit for mass and energy transfer between the upstream solar wind and its induced magnetosphere. However, our understanding of its global properties remains limited. Using 9 years of data from NASA's Mars Atmosphere and Volatile EvolutioN mission, we performed a quantitative statistical analysis to ...
Abigail Tadlock, Chuanfei Dong, Chi Zhang, Markus Fränz, Hongyang Zhou, Jiawei Gao   +5 more
wiley   +1 more source