Results 61 to 70 of about 279 (164)

Development and Cancellation of Long‐Duration Positive Ionospheric Storms: Both Changes of the F2‐Layer Peak Height and O/N2 Ratio Can Be Decisive

Space Weather, Volume 24, Issue 7, July 2026.
Abstract For decades, two competing hypotheses on the key drivers of mid‐latitude long‐duration positive ionospheric storms (LDPS) have been considered: (a) an increase of the F2‐layer peak height (hmF2) and (b) an increase in the atomic oxygen to molecular nitrogen density ratio (O/N2).
D. V. Kotov, M. O. Reznychenko, P. G. Richards, O. V. Bogomaz, L. P. Goncharenko, L. J. Paxton, M. Hernández‐Pajares, A. I. Reznychenko, D. P. Shkonda, V. V. Barabash, L. Ya. Emelyanov, I. F. Domnin, A. Ye. Miroshnikov, V. P. Burmaka, D. A. Dzyubanov, Yu. I. Podyachiy   +15 more
wiley   +1 more source

Saturation of Ionospheric Currents under Extreme Environments

The Astrophysical Journal
Strong solar wind conditions can drive large electric potentials across planetary polar caps, but previous studies have shown that the cross polar cap potential reaches a saturation point during periods of high interplanetary magnetic field (IMF ...
Fatemeh Bagheri, Alex Glocer
doaj   +1 more source

Atmospheric Tides Imprint a Wavenumber‐4 Structure in Topside Ionospheric ELF Wave Intensity

Geophysical Research Letters, Volume 53, Issue 12, 28 June 2026.
Abstract Atmospheric tides produce a well known pronounced longitudinal wavenumber‐4 (WN‐4) structure in the ionosphere, but their influence on electromagnetic‐wave propagation through the ionosphere remains poorly constrained. Here we use DEMETER satellite measurements to show that the extremely low frequency (ELF) electric field in the low‐latitude ...
Li Liao, Shufan Zhao, Maosheng He, Yatong Cui, Jinlei Li   +4 more
wiley   +1 more source

Annual and Seasonal Occurrence Pattern of Auroral Kilometric Radiation Associated with the Interplanetary Magnetic Field

The Astrophysical Journal Letters
Auroral kilometric radiation (AKR) is a widely existing strong radio emission from the Earth’s magnetosphere and is generated by suprathermal (1–10 keV) electrons in the polar cavity.
Ping Li, Sai Zhang, Fuliang Xiao, Hongming Yang, Shengyi Ye, Si Liu, Yihua He, Qiwu Yang, Jiawen Tang, Archie James Johnston   +9 more
doaj   +1 more source

Electron Scattering by Highly Oblique Quasi‐Electrostatic Chorus Waves Under Realistic Magnetospheric Conditions

Geophysical Research Letters, Volume 53, Issue 12, 28 June 2026.
Abstract Using Van Allen Probes data (2013–2015), we report that highly oblique chorus waves frequently occur in low‐density regions where fpe/fce≈3 ${f}_{\text{pe}}/{f}_{\text{ce}}\approx 3$. These waves exhibit an electric‐to‐magnetic energy ratio PE/c2PB>0.5 $\sqrt{{P}_{\mathrm{E}}/{c}^{2}{P}_{\mathrm{B}}} > 0.5$, much higher than the typical <0.1 ${
Lixian Yang, Si Liu, Zhonglei Gao, Wenya Li, Fuliang Xiao, Zhaoguo He, Xingran Chen, Yuyue Jin, Qian He, Zhoukun Deng, Jiawen Tang   +10 more
wiley   +1 more source

Earthward Propagated Auroral Kilometric Radiation: Observations From Polar

Geophysical Research Letters, Volume 53, Issue 12, 28 June 2026.
Abstract Auroral Kilometric Radiation (AKR), the strongest natural radio emission from Earth's magnetosphere, has been primarily observed in space. It is generally understood to propagate anti‐Earthward and be detected at large radial distances, while Earthward‐directed waves are thought to be blocked by the ionosphere. Surprisingly, AKR‐like emissions
Olha Melnychenko, Siyuan Wu, Daniel K. Whiter, Baptiste Cecconi, Claire Baskvetich   +4 more
wiley   +1 more source

Determining the State of Jupiter’s Magnetosphere Using In Situ and Remote Sensing Observations

The Astrophysical Journal
While Jupiter’s magnetosphere is primarily governed by internal processes, variations in solar wind conditions can significantly modulate magnetospheric energy.
J. W. Sun, L. Xie, Z. H. Yao, S. Y. Fu, B. Zhang, Y. Xu, F. Leppard, Y. N. Chen, D. Grodent, L. C. Ray, B. Bonfond, W. R. Dunn   +11 more
doaj   +1 more source

RAMBO. I. Project Introduction and First Results with uGMRT

The Astrophysical Journal
Magnetic hot stars can emit both coherent and incoherent nonthermal radio emission. Understanding the nature of these emissions and their connection to stellar rotation and magnetic field characteristics remains incomplete.
Z. Keszthelyi, K. Kurahara, Y. Iwata, Y. Fujii, H. Sakemi, K. Takahashi, S. Yoshiura   +6 more
doaj   +1 more source

Evaluating Star–Planet Interactions with Zeeman Doppler Imaging: Case Study in YZ Ceti

The Astrophysical Journal
The recent detections of radio emission from the nearby exoplanet host, YZ Ceti, suggest that the star is possibly interacting with its rocky innermost planet.
J. Sebastian Pineda, Stefano Bellotti, Jackie Villadsen, Aline Vidotto, Julien Morin, Colin P. Folsom   +5 more
doaj   +1 more source

Rapid Rotation of Polarization Orientations in PSR B1919+21’s Single Pulses: Implications on Pulsar’s Magnetospheric Dynamics

The Astrophysical Journal
We analyze and model rapid rotations of polarization orientations in PSR B1919+21’s single pulses based on Five-hundred-meter Aperture Spherical radio Telescope observation data.
Shunshun Cao, Jinchen Jiang, Jaroslaw Dyks, Kejia Lee, Jiguang Lu, Lucy S. Oswald, Weiyang Wang, Renxin Xu   +7 more
doaj   +1 more source