Results 41 to 50 of about 991 (130)

An Ionospheric Storm Scale Index Based on TEC: Comparative Analysis for China Region

Space Weather, Volume 24, Issue 8, August 2026.
Abstract Defining a standardized ionospheric storm scale is challenging given the ionosphere's inherent complexity and susceptibility to multiple driving factors. In this study, a novel ionospheric storm scale (ISS) index is developed based on statistical analysis of total electron content (TEC) data from 257 ground‐based GNSS stations across China ...
Shuangshuang Shi, Yunfei Shi, Kefei Zhang, Bingfeng Tan, Fucheng Song, Peng Sun, Yu Li, Yifan Liu, Shouxing Zhao   +8 more
wiley   +1 more source

The Impact of Enhanced Extreme-ultraviolet Flux on the Upper Atmosphere of Earth-like Exoplanets

The Astrophysical Journal
Identifying Earth-like planets outside our solar system is a leading research goal in astronomy, but determining if candidate planets have atmospheres, and more importantly if they can retain atmospheres, is still out of reach.
Lukas Hanson, Ofer Cohen, Aaron J. Ridley, Alex Glocer   +3 more
doaj   +1 more source

Auroral Effect on Mid‐Latitude Ionospheric Disturbances Over Europe During the Extreme Geomagnetic Storm of 10 May 2024

Space Weather, Volume 24, Issue 8, August 2026.
Abstract Large ionospheric disturbances were observed over Europe during the extreme geomagnetic storm on 10 May 2024. This study analyzes GNSS‐derived total electron content (TEC) and all‐sky imager data to investigate these disturbances. Pronounced TEC enhancements, irregularities, and strong gradients were confined to the auroral region above the ...
Grzegorz Nykiel, Joanna Kanska, Hiroatsu Sato, Shin‐ichiro Oyama, Kazuo Shiokawa, David R. Themens   +5 more
wiley   +1 more source

AWSoM Magnetohydrodynamic Simulation of a Solar Active Region. II. Statistical Analysis of Alfvén Wave Dissipation and Reflection, Scaling Laws, and Energy Budget on Coronal Loops

The Astrophysical Journal
The coronal heating problem has been a major challenge in solar physics, and a tremendous amount of effort has been made over the past several decades to solve it.
Tong Shi, Ward Manchester IV, Enrico Landi, Bart van der Holst, Judit Szente, Yuxi Chen, Gábor Tóth, Luca Bertello, Alexander Pevtsov   +8 more
doaj   +1 more source

Model‐Based Analysis of Ionospheric TEC Disturbances Over China and Adjacent Regions During the May 2024 Super Geomagnetic Storm

Space Weather, Volume 24, Issue 8, August 2026.
Abstract This study uses observation data from multi‐constellation (GPS/GLONASS/Galileo/BeiDou) ground‐based Global Navigation Satellite Systems (GNSS) networks and a non‐integrated spherical harmonic function modeling methodology to develop an ionospheric Total Electron Content (TEC) model with high spatiotemporal resolution (1° × 1° in longitude and ...
Heng Xu, Wengeng Huang, Jiayue Yang, Hua Shen, Lei Zhang, Xin Wang   +5 more
wiley   +1 more source

Recent Advances in Conjugation Chemistry Expanding the Applications of the DNA Tetrahedron

Chemical Biology &Drug Design, Volume 108, Issue 2, August 2026.
The tetrahedral DNA nanostructure (TDN) is a promising drug delivery and biosensing platform that can be chemically modified with absolute payload precision. This review highlights explicit conjugation chemistries driving functionalization of the TDN for a broad range of applications, advancing its role in support of next‐generation biomimetic ...
Tyler J. Rutherford, Christopher J. Wilds   +1 more
wiley   +1 more source

Pre‐Existing Plasmaspheric Density Structure

Geophysical Research Letters, Volume 53, Issue 14, 28 July 2026.
Abstract We perform a basic model experiment: we run two nearly identical plasmapause simulations, differing only by their initial conditions. The first run contains initial fine‐scale and mesoscale structure, and the second run is initialized with a featureless, circular plasmapause.
J. Goldstein, M. F. Thomsen
wiley   +1 more source

<title>Superconducting tunnel junctions as detectors for extreme-ultraviolet astronomy</title> [PDF]

SPIE Proceedings, 1997
Anthony J. Peacock, Peter Verhoeve, Marcos Bavdaz, Roland H. den Hartog, D. Perez, Abel Poelaert, Nicola Rando   +6 more
openaire   +1 more source

A direct black-hole mass measurement in a little red dot at high redshift. [PDF]

Nature
Juodžbalis I, Marconcini C, D'Eugenio F, Maiolino R, Marconi A, Übler H, Scholtz J, Ji X, Jones GC, Perna M, Arribas S, Bennett JS, Bromm V, Bunker AJ, Carniani S, Charlot S, Cresci G, Dayal P, Egami E, Fabian A, Inayoshi K, Isobe Y, Ivey LR, Koudmani S, Laporte N, Liu B, Lyu J, Mazzolari G, Monty S, Parlanti E, Pérez-González PG, Robertson B, Schneider R, Sijacki D, Tacchella S, Trinca A, Valiante R, Volonteri M, Witstok J, Zhang S.   +39 more
europepmc   +1 more source

Redirection and reshaping of intense extreme-ultraviolet radiation. [PDF]

Sci Adv
He Y, Magunia A, Mandal H, Mourtada MA, Kleine C, Saha A, Rebholz M, Borisova GD, Hedewig L, Lindenblatt H, Trost F, Frühling U, Papadopoulou CC, Appi E, Düsterer S, Lang T, Alisauskas S, Heyl CM, Palutke S, Braune M, Bömer C, Krebs D, Vinci D, Mosel P, Biesterfeld P, Hartl I, Moshammer R, Kovacev M, Ueda K, Gaarde MB, Ott C, Pfeifer T.   +31 more
europepmc   +1 more source