Results 81 to 90 of about 3,816 (192)

Spatiotemporal structure of edge harmonic oscillation and its role in ELM-free QH-mode at KSTAR

Nuclear Fusion
In Quiescent H-mode (QH-mode), edge-localized modes (ELMs) are naturally replaced by a low- $n$ edge harmonic oscillation (EHO), yet the self-regulating transport mechanism driven by the EHO remains insufficiently understood.
Jaehyun Lee, SangKyeun Kim, Young-Mu Jeon, Minwoo Kim, Dong-Kwon Kim, Gunsu S. Yun   +5 more
doaj   +1 more source

Self‐Limiting of Artificial Electron Radiation Belts: Evidence From the Starfish Prime High‐Altitude Nuclear Explosion

Journal of Geophysical Research: Space Physics, Volume 131, Issue 8, August 2026.
Abstract The 1962 Starfish Prime high‐altitude 1.4‐megaton nuclear detonation injected large amounts of fission‐produced energetic electrons into the inner magnetosphere (L = 1.12), creating an intense artificial radiation belt that persisted for years. In this study, we revisit historical data from this unprecedented event to investigate the potential
L. Olifer, I. R. Mann
wiley   +1 more source

Reconstructing Europa's Atmosphere From H2+ ${\mathbf{H}}_{\mathbf{2}}^{+}$ Pickup Ions Detected During the Juno PJ45 Flyby

Journal of Geophysical Research: Planets, Volume 131, Issue 8, August 2026.
Abstract We use a suite of single‐species (H2 ${\mathrm{H}}_{2}$) and multispecies (H2+O2+H+O ${\mathrm{H}}_{2}+{\mathrm{O}}_{2}+\mathrm{H}+\mathrm{O}$) Direct Simulation Monte Carlo models of Europa's atmosphere to interpret the H2+ ${\mathrm{H}}_{2}^{+}$ pickup ions detected by Juno at distances beyond 2 $2$ Europa radii RE $\left({R}_{E}\right ...
Shane R. Carberry Mogan, Andrew R. Poppe, Lucas Liuzzo, Jamey R. Szalay, Sean P. Ellis, Robert E. Johnson, Lorenz Roth   +6 more
wiley   +1 more source

Ultra‐Low‐L Sub‐MeV Electron Microbursts During the May 2024 Super Storm

Geophysical Research Letters, Volume 53, Issue 14, 28 July 2026.
Abstract During the May 2024 super storm, we identified sub‐second microburst‐type relativistic electron precipitation events at McIlwain's L∼2 $L\sim 2$ in low‐Earth orbit using the Gamma‐ray Burst Monitor (CGBM) onboard the CALorimetric Electron Telescope on the International Space Station.
Miki Kurihara, Satoshi Nakahira, Ryuho Kataoka, Yoshizumi Miyoshi, Yuto Katoh, Kazutaka Yamaoka, Yuta Kawakubo, Ken Ebisawa, Shoji Torii, Kazuhiro Yamamoto, Atsuki Shinbori, Shoya Matsuda, Yoshiya Kasahara, Fuminori Tsuchiya, Iku Shinohara, Lauren W. Blum, Alessandro Bruno   +16 more
wiley   +1 more source

Velocity-space tomography of an MeV fast-ion tail generated by three-ion scheme ICRF heating at JET

Nuclear Fusion
Recently-developed methods are used successfully to reconstruct the two-dimensional velocity-space distribution of the energetic minority MeV ion tail created by heating in the ion cyclotron range of frequencies (ICRFs) in the D–D $ _{\mathrm{NBI}}$ – ^3
B.C.G. Reman, H. Järleblad, Y. Dong, J. Eriksson, M. Nocente, Y. Kazakov, E. Lerche, D. Van Eester, R.O. Dendy, D. Moseev, A. Snicker, M. Rud, B.S. Schmidt, Ž. Štancar, A. Valentini, M. Salewski, JET Contributors   +16 more
doaj   +1 more source

Electromagnetic Ion Cyclotron Waves in the Initial Phase of Geomagnetic Storms

Geophysical Research Letters, Volume 53, Issue 13, 16 July 2026.
Abstract Using simultaneous magnetic field observations from 10 satellites and an automated detection algorithm, we identify broad regions of electromagnetic ion cyclotron (EMIC) wave activity during the initial phases of geomagnetic storms between September 2015 and October 2019.
Taylor R. Whitney Aegerter, Lauren W. Blum   +1 more
wiley   +1 more source

MMS Observations of the Energetic Particles Within Kelvin‐Helmholtz Waves at the Boundary of the 10 May 2024 Coronal Mass Ejection (CME)

Geophysical Research Letters, Volume 53, Issue 13, 16 July 2026.
Abstract On 10 May 2024, Earth was hit by a CME that drove the largest geomagnetic storm in 20 years. Multi‐spacecraft observations previously showed that the ∼100 nT north‐south IMF bz ${b}_{z}$ variation was driven by Kelvin‐Helmholtz waves with wavelength ∼250 RE ${R}_{E}$ and reconnection jets in the ±z $\pm z$‐direction (Nykyri, 2024a, https://doi.
Katariina Nykyri, Neetasha Arya, Scott Boardsen, Guan Le, Harri Laakso, Lynn Wilson, Xuanye Ma, Katherine Holland, Brandon Burkholder, Leon Ofman, Kyoung‐Joo Hwang, Dinesh Radhakrishnan, Shiva Kavosi, Daniel Gershman, Christine Gabrielse, Barbara Giles, Stephen Fuselier, Jim Burch   +17 more
wiley   +1 more source

Deuterium and tritium density determination at JET using neutron diagnostics

Nuclear Fusion
The fuel ion densities of tritium (T) and deuterium (D) are important parameters for reactor control in fusion experiments. The fuel ion densities typically need to be determined for a wide range of experimental conditions, anywhere between pure ...
B. Vingren, J. Eriksson, S. Conroy, G. Ericsson, A. Hjalmarsson, F. Auriemma, A. Boboc, C. Challis, D. Keeling, D. King, K. Kirov, S. Menmuir, M. Maslov, M. Poradzinski, JET Contributors, the EUROfusion Tokamak Exploitation Team   +15 more
doaj   +1 more source

Influence of ion cyclotron range of frequencies heating on neutron emission rate in HL-3 tokamak

He jishu
BackgroundIon cyclotron range of frequencies (ICRF) heating is one of the most widely used auxiliary heating methods in tokamaks. The HL-3 tokamak plans to equip a 6 MW ICRF heating system to conduct discharge experiments of high-performance plasma ...
YANG Guanming, HAO Guangzhou, LU Lingfeng, DONG Guanqi, HAO Baolong, WANG Shuo   +5 more
doaj   +1 more source

Initial experience with an 11 MeV self-shielded medical cyclotron on operation and radiation safety

Journal of Medical Physics, 2007
A self-shielded medical cyclotron (11 MeV) was commissioned at our center, to produce positron emitters, namely, 18 F, 15 O, 13 N and 11 C for positron emission tomography (PET) imaging.
Pant G, Senthamizhchelvan S
doaj