Results 61 to 70 of about 859 (172)

Thermal Escape of Atomic Hydrogen on Mars: A Comprehensive View With a General Circulation Model

Journal of Geophysical Research: Planets, Volume 131, Issue 6, June 2026.
Abstract Mars loses water mainly through the photodissociation of water vapor, followed by the thermal escape of light hydrogen atoms. Observations have revealed large seasonal variations in hydrogen concentration in the upper thermosphere, peaking during southern summers and intensifying during dust storms.
Alexander S. Medvedev, Ngan H. D. Trinh
wiley   +1 more source

Experimental and theoretical study on emission spectra of a nitrogen photoionized plasma induced by intense EUV pulses

EPJ Web of Conferences, 2018
Spectral lines of low-temperature nitrogen photoionized plasma were investigated. The photoionized plasma was created in the result of irradiation N2 gas using laser plasma EUV radiation pulses.
Saber Ismail, Bartnik Andrzej, Skrzeczanowski Wojciech, Wachulak Przemyslaw, Jarocki Roman, Fiedorowicz Henryk, Limpouch Jiri   +6 more
doaj   +1 more source

Multi‐Wavelength Transformer‐Based 24‐Hour Solar Flare Forecasting at the Active‐Region Level

Space Weather, Volume 24, Issue 6, June 2026.
Abstract Solar flare forecasting remains challenging due to the complex spatiotemporal evolution of solar active regions (ARs) and the severe class imbalance associated with high‐impact events. In this work, we investigate a transformer‐based framework for active‐region–level solar flare forecasting using short sequences of multi‐wavelength ...
Dunia Alatoom, Nikos Nikolaou
wiley   +1 more source

EUV/Soft X-ray Spectra for Low B Neutron Stars [PDF]

International Astronomical Union Colloquium, 1996
Recent ROSAT and EUVE detections of spin-powered neutron stars suggest that many emit ‘thermal’ radiation, peaking in the EUV/soft X-ray band. These data constrain the neutron stars’ thermal history, but interpretation requires comparison with model atmosphere computations, since emergent spectra depend strongly on the surface composition and magnetic ...
Romani, R. W., Rajagopal, M., Rogers, F. J., Iglesias, C. A.   +3 more
openaire   +2 more sources

Altered Pathogen Spectrum of Spontaneous Bacterial Peritonitis in Patients Treated With Proton Pump Inhibitors

Alimentary Pharmacology &Therapeutics, Volume 63, Issue 11, Page 1487-1494, June 2026.
This multicenter, observational study reveals distinct alterations in the microbial spectrum of spontaneous bacterial peritonitis (SBP) associated with proton pump inhibitor use. These results are especially relevant for guiding empiric antibiotic therapy of SBP.
Philip Kitchen, Sarah L. Schütte, Tammo L. Tergast, Benjamin Maasoumy, Leonie Braun, Ulrich vor dem Esche, Georg Häcker, Marcus M. Mücke, Marlene Reincke, Michael Schultheiss, Robert Thimme, Siegbert Rieg, Dominik Bettinger, Lukas Sturm   +13 more
wiley   +1 more source

Recent Developments in Deep‐Ultraviolet Flat Optics

Nanophotonics, Volume 15, Issue 10, 27 May 2026.
Deep‐ultraviolet flat optics (DUVFO) is emerging as a key platform for next‐generation photonics, enabling advanced functionalities beyond conventional DUV optics. This review outlines materials, devices, and system advances, highlighting wide‐bandgap platforms, while identifying key challenges in dispersion control, characterization, and wafer‐scale ...
Omar A. M. Abdelraouf, Tao Wang, Zeng Wang   +2 more
wiley   +1 more source

Surprisingly Large Doppler Shifts in Hinode EUV Imaging Spectrometer (EIS) Solar Spectra Resulting from an Inconspicuous Small-scale Jet in Extreme-ultraviolet Images

The Astrophysical Journal Letters
Strong EUV line shifts in solar spectra are generally indicative of highly dynamic and explosive events that are easily detected in comparable-wavelength EUV images, with the strongest such line shifts (several 100 km s ^−1 ) occurring in solar flares ...
Alphonse C. Sterling, Louise K. Harra, Navdeep K. Panesar, Ronald L. Moore   +3 more
doaj   +1 more source

Signatures of localised particle acceleration at a global coronal shock wave

Astronomy & Astrophysics
Context. Extreme ultraviolet (EUV) waves are global waves in the solar corona that accelerate particles. The efficiency of this acceleration depends on local plasma characteristics such as the Alfvén speed and the geometry of the magnetic field.
Cuddy C., Long D. M., Nedal M., Bhunia S., Gallagher P. T.   +4 more
doaj   +1 more source

The Contribution of the Russell‐McPherron Effect to the Semiannual Variation in Thermospheric Density

Journal of Geophysical Research: Space Physics, Volume 131, Issue 5, May 2026.
Abstract A number of external sources and internal circulation mechanisms have been proposed to explain the well‐known semiannual variation in global mean thermospheric densities. We use the polarity of the Y $Y$‐component (dawn to dusk) of the Interplanetary Magnetic Field (IMF) in the Geocentric Solar Equatorial (GSEQ) frame to identify the influence,
Mike Lockwood, Chris J. Scott, James O’Donoghue, Mat J. Owens, Luke A. Barnard   +4 more
wiley   +1 more source

Updates, Examples and Validation of the Global Ionosphere Thermosphere Model

Space Weather, Volume 24, Issue 5, May 2026.
Abstract This study provides an updated description, example simulations, and validation of the Global Ionosphere Thermosphere Model (GITM). The updates to GITM include using an exothermic semi‐implicit chemistry scheme that no longer requires an altitude dependent heating efficiency; an ionospheric wind‐driven dynamo; improved neutral, ion, and ...
A. J. Ridley, C. Wu, A. Bukowski, J. Bell   +3 more
wiley   +1 more source