Results 41 to 50 of about 995 (183)

Iono‐PhyTAU: A Lightweight Global Ionospheric TEC Prediction Model Based on Temporal Attention Unit and Physical Condition Constraints of the Ionosphere

Space Weather, Volume 24, Issue 9, September 2026.
Abstract Ionospheric Total Electron Content (TEC) is the primary error source causing signal delay in Global Navigation Satellite Systems (GNSS). High‐precision TEC prediction is essential for positioning, navigation, and space weather monitoring. Although deep learning models including ConvLSTM, ConvGRU, and Transformer have advanced TEC forecasting ...
Yiling Gui, Yajun Xu, Song Jia, Miaomiao Wang, Boyang Hao, Xinjie Wu   +5 more
wiley   +1 more source

What Determines the X-Ray Intensity and Duration of a Solar Flare? [PDF]

The Astrophysical Journal, 2019
Abstract Solar flares are observed and classified according to their intensity measured with the Geostationary Operational Environmental Satellite (GOES) X-ray Sensors. We show that the duration of a flare, as measured by the full width at half maximum (FWHM) in GOES is not related to the size of the flare as measured by GOES intensity ...
Jeffrey W. Reep, Kalman J. Knizhnik
openaire   +2 more sources

Intense Hard X-Ray Emissions in C-class Flares: A Statistical Study with ASO-S/HXI Data

The Astrophysical Journal Letters
In the standard model of solar eruptive events, coronal mass ejections (CMEs) and flares are associated with each other through magnetic reconnection initiated by erupting flux ropes.
Changxue Chen, Yang Su, Wei Chen, Jingwei Li, Fu Yu, Weiqun Gan   +5 more
doaj   +1 more source

Can we detect X/M/C-class solar flares from global navigation satellite system data?

Results in Physics, 2019
Based on the total electron content (TEC) data from global navigation satellite system (GNSS), we analyzed 224 classified solar flares (SFs) occurred in 2014–2017. We suggest an algorithm for SF automatic detection.
Semen V. Syrovatskiy, Yury V. Yasyukevich, Ilya K. Edemskiy, Artem M. Vesnin, Sergey V. Voeykov, Ilya V. Zhivetiev   +5 more
doaj   +1 more source

Spaceborne and spaceborn: Physiological aspects of pregnancy and birth during interplanetary flight

Experimental Physiology, Volume 111, Issue 9, Page 4015-4040, 1 September 2026.
Abstract Crewed interplanetary return missions that are on the planning horizon will take years, more than enough time for initiation and completion of a pregnancy. Pregnancy is viewed as a sequence of processes – fertilization, blastocyst formation, implantation, gastrulation, placentation, organogenesis, gross morphogenesis, birth and neonatal ...
Arun V. Holden
wiley   +1 more source

X-ray emission from solar neighbourhood flare stars [PDF]

Symposium - International Astronomical Union, 1990
A brief summary is given of a comprehensive analysis of EXOSAT observations of solar neighbourhood flare stars. Special attention is devoted to the discussion of quiescent X-ray emission and time variability.
R. Pallavicini, L. Stella, G. Tagliaferri   +2 more
openaire   +1 more source

First Quantitative Results on the Response of Green and Red Line Dayglow Emissions to Solar Flares of Different Magnitudes

Geophysical Research Letters
Flares originate from the impulsive release of magnetic energy in the solar atmosphere. The rise in X‐ray flux enhances ionization/electron content in the upper atmosphere, modifying the photochemical and dynamical processes that govern the ionosphere ...
Komal, Duggirala Pallamraju
doaj   +1 more source

Lunar Dayside Surface Potentials in the Terrestrial Magnetotail Inferred From Comparing Observed and Modeled Photoelectrons

Geophysical Research Letters, Volume 53, Issue 15, 16 August 2026.
Abstract As an airless body, the lunar surface is charged as a result of balancing electric currents into and away from the surface. Lunar surface charging is important for both scientific and human‐exploration purposes. The nightside surface charging has been well characterized by previous studies, but less so for the dayside.
Shaosui Xu, Andrew R. Poppe, Yuki Harada, Phillip C. Chamberlin   +3 more
wiley   +1 more source

A Joint Microwave and Hard X-Ray Study toward Understanding the Transport of Accelerated Electrons During an Eruptive Solar Flare

The Astrophysical Journal
The standard flare model, despite its success, is limited in comprehensively explaining the various processes involving nonthermal particles. One such missing ingredient is a detailed understanding of the various processes involved during the transport ...
Surajit Mondal, Andrea F. Battaglia, Bin Chen, Sijie Yu   +3 more
doaj   +1 more source

Accelerated gradient methods for the x-ray imaging of solar flares [PDF]

Inverse Problems, 2014
In this paper we present new optimization strategies for the reconstruction of X-ray images of solar flares by means of the data collected by the Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI). The imaging concept of the satellite is based of rotating modulation collimator instruments, which allow the use of both Fourier imaging ...
BONETTINI, Silvia, PRATO, Marco
openaire   +4 more sources