Results 101 to 110 of about 26,504 (226)

The High‐Latitude Workbox for the Ionosphere (HAWK‐I): A New Toolkit for Real‐Time Specification of the Arctic Ionosphere

Space Weather, Volume 24, Issue 9, September 2026.
Abstract The high‐latitude ionosphere exhibits rapid spatial and temporal variability during geomagnetically active periods, creating persistent challenges for accurate nowcasts. The High‐latitude Workbox for the Ionosphere (HAWK‐I) is a real‐time ionosphere nowcast and specification system designed for operational deployment to address these ...
Patrick Dandenault, Clayton Cantrall, Robert Schaefer, Sebastijan Mrak, Giuseppe Romeo, Lisa Knowles, Cathryn Mitchell, Gary Bust   +7 more
wiley   +1 more source

When Communication Enables Catastrophe: Nuclear Risk and the Short Lifetimes of Technological Civilizations

Risk Analysis, Volume 46, Issue 9, September 2026.
ABSTRACT The Fermi paradox may partly reflect technological self‐destruction acting as a Great Filter during post‐industrial development. Because the empirical record consists of a single civilization observed over an eighty‐year nuclear age, the exercise reported here is best understood as a structured, historically anchored scenario analysis rather ...
Vincenzo Alfano
wiley   +1 more source

Variations of Mid‐Magnetotail Magnetic Pressure During Substorms

Geophysical Research Letters, Volume 53, Issue 16, 28 August 2026.
Abstract Magnetic reconnection is commonly observed in the mid‐tail plasma sheet during substorms, the mechanism behind this spatial preference, however, remains unsolved. This study focuses on magnetic pressure evolution within this critical region during substorms.
Xiaowei Ma, Hui Zhang, Huanzhi Yuan, Runze Li   +3 more
wiley   +1 more source

Spiky Bursts of Energetic Electron Beams Upstream of Nonstationary Quasi‐Perpendicular Shocks

Geophysical Research Letters, Volume 53, Issue 16, 28 August 2026.
Abstract Energetic electron beams play a crucial role in collisionless shocks by driving upstream plasma waves and providing seed populations for diffusive shock acceleration. However, the processes responsible for their generation at quasi‐perpendicular shocks remain poorly understood.
Ao Guo, Quanming Lu, San Lu, Shutao Yao, Xinliang Gao   +4 more
wiley   +1 more source

Statistical Study of Betatron and Fermi Electron Acceleration at Dipolarization Fronts

Geophysical Research Letters, Volume 53, Issue 15, 16 August 2026.
Abstract Magnetic reconnection jets in Earth's magnetotail are regions of electron heating and acceleration. They are often associated with dipolarization fronts (DFs), which are characterized by sharp increases in the northward magnetic field component Bz ${B}_{z}$.
A. Kolokotronis, D. B. Graham, Yu. V. Khotyaintsev, C. Norgren, K. Steinvall, L. Richard   +5 more
wiley   +1 more source

Gravitational Radiation From Binary Systems With Time Varying Masses

Annalen der Physik, Volume 538, Issue 8, August 2026.
We extend the standard approach pioneered in the works by Peters and Mathews to include the mass loss processes of the binary components, by obtaining the variations due to gravitational radiation of the main physical parameters. As an application of our results we consider gravitational radiation emission in binary magnetar systems.
Teodora M. Matei, Cristian A. Croitoru, Tiberiu Harko   +2 more
wiley   +1 more source

Ultrahigh-energy gamma-ray emission associated with black hole-jet systems. [PDF]

Natl Sci Rev
Cao Z, Aharonian F, Bai YX, Bao YW, Bastieri D, Bi XJ, Bi YJ, Bian WY, Bukevich AV, Cai C, Cao WY, Cao Z, Chang J, Chang JF, Chen A, Chen ES, Chen G, Chen HX, Chen L, Chen L, Chen MJ, Chen ML, Chen QH, Chen S, Chen SH, Chen SZ, Chen TL, Chen XB, Chen X, Chen Y, Cheng N, Cheng YD, Chu MC, Cui MY, Cui SW, Cui XH, Cui YD, Dai BZ, Dai HL, Dai Z, Luobu D, Diao YX, Dong XQ, Duan KK, Fan JH, Fan YZ, Fang J, Fang JH, Fang K, Feng CF, Feng H, Feng L, Feng S, Feng XT, Feng Y, Feng YL, Gabici S, Gao B, Gao CD, Gao Q, Gao W, Gao WK, Ge M, Ge TT, Geng L, Giacinti G, Gong G, Gou Q, Gu MH, Guo FL, Guo J, Guo XL, Guo YQ, Guo YY, Han YA, Hannuksela OA, Hasan M, He HH, He HN, He JY, He X, He Y, Hernández-Cadena S, Hou BW, Hou C, Hou X, Hu HB, Hu SC, Huang C, Huang DH, Huang J, Huang TQ, Huang WJ, Huang XT, Huang XY, Huang Y, Huang YY, Ji XL, Jia HY, Jia K, Jiang HB, Jiang K, Jiang XW, Jiang ZJ, Jin M, Kaci S, Kang MM, Karpikov I, Khangulyan D, Kuleshov D, Kurinov K, Li BB, Li C, Li C, Li D, Li F, Li H, Li H, Li J, Li J, Li K, Li L, Li RL, Li SD, Li TY, Li WL, Li XR, Li X, Li Y, Li Y, Li Z, Li Z, Liang EW, Liang YF, Lin SJ, Liu B, Liu C, Liu D, Liu DB, Liu H, Liu HD, Liu J, Liu JL, Liu JR, Liu MY, Liu RY, Liu SM, Liu W, Liu X, Liu Y, Liu Y, Liu YN, Lou YQ, Luo Q, Luo Y, Lv HK, Ma BQ, Ma LL, Ma XH, Mao JR, Min Z, Mitthumsiri W, Mou GB, Mu HJ, Neronov A, Ng KCY, Ni MY, Nie L, Ou LJ, Pattarakijwanich P, Pei ZY, Qi JC, Qi MY, Qin JJ, Raza A, Ren CY, Ruffolo D, Sáiz A, Semikoz D, Shao L, Shchegolev O, Shen YZ, Sheng XD, Shi Z, Shu FW, Song HC, Stenkin YV, Stepanov V, Su Y, Sun D, Sun H, Sun Q, Sun X, Sun Z, Tabasam NH, Takata J, Tam PHT, Tan HB, Tang Q, Tang R, Tang Z, Tian W, Tong C, Wan LH, Wang C, Wang G, Wang H, Wang J, Wang K, Wang K, Wang L, Wang L, Wang LY, Wang R, Wang W, Wang X, Wang XJ, Wang XY, Wang Y, Wang YD, Wang ZH, Wang ZX, Wang Z, Wei DM, Wei JJ, Wei YJ, Wen T, Weng SS, Wu CY, Wu HR, Wu QW, Wu S, Wu XF, Wu YS, Xi SQ, Xia J, Xia JJ, Xiang GM, Xiao DX, Xiao G, Xin YL, Xing Y, Xiong DR, Xiong Z, Xu DL, Xu RF, Xu RX, Xu WL, Xue L, Yan DH, Yan JZ, Yan T, Yang CW, Yang CY, Yang FF, Yang LL, Yang MJ, Yang RZ, Yang WX, Yang Z, Yao ZG, Ye XA, Yin LQ, Yin N, You XH, You ZY, Yu YH, Yuan Q, Yue H, Zeng HD, Zeng TX, Zeng W, Zeng X, Zha M, Zhang BB, Zhang BT, Zhang C, Zhang F, Zhang HF, Zhang HM, Zhang HY, Zhang JL, Zhang L, Zhang PF, Zhang PP, Zhang R, Zhang SR, Zhang SS, Zhang W, Zhang X, Zhang XP, Zhang Y, Zhang Y, Zhang ZP, Zhao J, Zhao L, Zhao LZ, Zhao SP, Zhao XH, Zhao Z, Zheng F, Zhong WJ, Zhou B, Zhou H, Zhou JN, Zhou M, Zhou P, Zhou R, Zhou XX, Zhou XX, Zhu BY, Zhu CG, Zhu FR, Zhu H, Zhu KJ, Zou YC, Zuo X.   +316 more
europepmc   +1 more source

The ORCA‐TWIN qCMOS Experiment I. Science Case and Commissioning at Calar Alto Observatory

Astronomische Nachrichten, Volume 347, Issue 7, August 2026.
ABSTRACT We describe a pilot study to explore a new generation of fast and low noise CMOS image sensors for time domain astronomy, using two remote telescopes with a baseline of 1635 km. The experiment involves direct imaging with novel qCMOS image sensor technology that combines fast readout with sub‐electron readout noise.
Martin M. Roth, Paško Roje, Stella Vješnica, Stefan Cikota, Alex J. Brown, Mike Kretlow, Marco Azzaro, Santiago Reinhart, Jesús Aceituno, Harry Dawson, Carsten Denker, Torsten Enßlin, Stephan Geier, Thomas Granzer, Thomas Kupfer, Gianluca Li Causi, Samaya Nissanke, José Luis Ortiz, Fernando Pedichini, Katja Poppenhäger, Axel Schwope   +20 more
wiley   +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

Speckle Observations With PISCO in Calern (France): III. Astrometric Measurements of Visual Double Stars in 2019 and New or Revised Orbits for STT531 AB, STT77 AB, STF1338 AB, COU1746, STT260, A1109 AB, HU1291, and A632 AB

Astronomische Nachrichten, Volume 347, Issue 7, August 2026.
ABSTRACT We present relative astrometric measurements of visual double stars, made in 2019 with the speckle camera PISCO at the 1‐m Epsilon telescope of the C2PU facility (Observatoire de la Côte d'Azur, Calern site). Our observing list contains orbital couples as well as double stars whose motion is still uncertain.
J.‐L. Prieur, M. Scardia, J.‐P. Rivet, E. Aristidi, J. F. Ling, L. Piccotti, L. Pansecchi, R. W. Argyle, L. Abe, P. Bendjoya, L. Maccarini, D. Vernet   +11 more
wiley   +1 more source