Results 131 to 140 of about 1,290,320 (212)

The Evolution of the Ionospheric Irregularities and Their Effects on GNSS Over China During the Geomagnetic Storm on 1 December 2023

Space Weather, Volume 24, Issue 4, April 2026.
Abstract This study investigated a large‐scale ionospheric irregularities event over low‐ to mid‐latitude China during the 1 December 2023 geomagnetic storm using ROTI data, loss‐of‐lock (LoL) in L2 from 250 GNSS receivers, and S4 data from 16 ISMs.
Yi Zeng, Donghe Zhang, Ke Li, Yaoyu Tian, Guanglin Yang   +4 more
wiley   +1 more source

The NRL OSO-4 Bragg crystal spectrometer instrument [PDF]

Two Bragg crystal spectrometers were placed on the OSO-4 satellite to study solar flare plasmas by their spectral emissions. The solar flare plasma parameters were measured with these spectrometers, which together covered a total wavelength range of 0.6 ...
Meekins, J. F.
core   +1 more source

Relationship between non-thermal electron energy spectra and GOES classes

, 2009
We investigate the influence of the variations of energy spectrum of non-thermal electrons on the resulting GOES classes of solar flares. Twelve observed flares with various soft to hard X-ray emission ratios were modelled using different non-thermal ...
Bahcall, Battaglia, Brown, Brownw, Culhane, Dennis, Dere, Fisher, Hannah, Kontar, Kosugi, Landi, Lin, M. Siarkowski, Mariska, Mariska, McDonald, Metcalf, Neupert, P. Rudawy, Qiu, R. Falewicz, Sato, Siarkowski, Thomas, Tsuneta, Vernazza, Veronig, White   +28 more
core   +1 more source

MAVEN Observations of the Martian Magnetospheric Response to Simultaneous Quasi‐Radial Interplanetary Magnetic Field and Low Dynamic Pressure

Journal of Geophysical Research: Space Physics, Volume 131, Issue 4, April 2026.
Abstract The state of Mars' induced magnetosphere is highly dependent on upstream solar wind conditions. Changes in dynamic pressure alter the locations of magnetospheric boundaries such as the bow shock and induced magnetosphere boundary, while the orientation of the interplanetary magnetic field (IMF) impacts the formation of the bow shock.
K. G. Hanley, S. Xu, C. M. Fowler, C. Mazelle, D. L. Mitchell, J. P. McFadden, J. S. Halekas, L. Andersson, J. Espley, S. M. Curry   +9 more
wiley   +1 more source

Dual-stage Flare Prediction Using a Full-disk Flare Index: Trend-disturbance Decomposition and Hybrid Forecasting Model

The Astrophysical Journal Supplement Series
Accurate prediction of solar flares is essential for space weather warnings and safeguarding technological infrastructure. This study proposes a dual-stage flare prediction framework leveraging the full-disk flare index (FI).
Shuainan Yan, Yanxia Cai, Bingxian Luo, Liqin Shi, Yanmei Cui   +4 more
doaj   +1 more source

Observation of Forbush Decreases and GLE‐74 Recorded During Ground‐Level Neutron Monitoring Survey From Various Sites

Space Weather, Volume 24, Issue 4, April 2026.
Abstract Ground‐level neutron monitors (NMs) are essential tools for monitoring space weather events, including the detection and alerting of ground‐level enhancement (GLE) events. This study presents findings from a neutron monitoring survey using two compact N50L neutron slab‐based subsystems deployed across various field sites in the United Kingdom (
D. C. Mashao, T. L. Alton, F. Baird, C. L. Binnersley, S. Bradnam, S. Croft, M. J. Joyce, L. Packer, K. Ryden, T. Turner, J. A. Wild, M. D. Aspinall   +11 more
wiley   +1 more source

Estimation of Global Increase of Radiation Dose Rates During the Ground Level Enhancement on 11–12 November 2025 Using WASAVIES

Space Weather, Volume 24, Issue 4, April 2026.
Abstract WArning System for AVIation Exposure to Solar energetic particles (WASAVIES) is a physics‐based nowcasting system designed to support warning operations for aviation exposure to solar energetic particles (SEPs) by providing near‐real‐time global SEP dose‐rate estimates.
Tatsuhiko Sato, Daikou Shiota, Yûki Kubo, Ryuho Kataoka, Hiroshi Yasuda, Shoko Miyake, Mamoru Ishii, Yoshizumi Miyoshi   +7 more
wiley   +1 more source

A New Phase for Space Weather

Space Weather, Volume 24, Issue 4, April 2026.
Abstract As we move into the declining phase of solar cycle 25, the sunspot number is going down but space weather impacts are not disappearing. Solar energetic particle events, large x‐ray flares, and geomagnetic storms are still happening and the declining phase will bring a different balance of hazards.
Steven K. Morley
wiley   +1 more source

Disentangling Thermal and Abundance Characteristics in a Solar Flare Using SDO/AIA, Hinode/XRT, and MinXSS-1 Observations

The Astrophysical Journal
We investigate the thermal properties of a solar flare by the observations of the soft X-ray Telescope on board Hinode and the Atmospheric Imaging Assembly (AIA) on board the Solar Dynamics Observatory. Our analysis reveals a tenuous but hot plasma cloud
Xiaoyan Xie, Anna Chen, Crisel Suarez, Katharine K. Reeves, Soumya Roy, Christopher S. Moore, Nishu Karna, Joy Velasquez   +7 more
doaj   +1 more source

Solar Flare 1/f Fluctuations from Amplitude-Modulated Five-Minute Oscillation. [PDF]

Entropy (Basel), 2023
Morikawa M, Nakamichi A.
europepmc   +1 more source