Results 61 to 70 of about 1,126,700 (167)

Testing Theories of Solar Coronal Heating with Three-dimensional Forward Modeling

The Astrophysical Journal
After almost a century of speculation, the physical processes responsible for heating the Sun’s corona remain uncertain. Observations of coronal loops at extreme ultraviolet and X-ray wavelengths have provided substantial insights, such as the constraint
Steven R. Cranmer, Chris R. Gilly
doaj   +1 more source

The May 2024 Storm: The Cusps and Dayside Magnetopause in Simulated Soft X‐Rays

Geophysical Research Letters, Volume 53, Issue 20, 28 October 2026.
Abstract The coronal mass ejection (CME) arriving at Earth on 10 May 2024 caused the most intense geomagnetic storm in the last two decades, resulting in highly unusual cusp and magnetopause dynamics. We simulate soft X‐Ray emission due to solar wind charge exchange with exospheric neutrals to image the global dayside dynamics, focusing on the impact ...
J. Ng, L.‐J. Chen, B. Burkholder, D. Sibeck, F. S. Porter, K. H. Pham, V. G. Merkin, H. Connor, J. W. Bonnell, S. Petrinec, Y. Zou, B. Alterman, G. Cucho‐Padin   +12 more
wiley   +1 more source

Astronomy & Astrophysics (CAUCASUS)-VOLUME 2

, 2020
The second volume of the international scientific journal Astronomy & Astrophysics (Caucasus) contains the scientific works delivered as scientific reports by their authors at International Scientific Conference Modern Problems of Astrophysics – II ...
(CAUCASUS), Astronomy & Astrophysics
core   +1 more source

Thermospheric response to solar EUV variability probed with orbital-energy decay from NinjaSat CubeSat GNSS telemetry

Earth, Planets and Space
Solar extreme ultraviolet (EUV) radiation heats and expands the thermosphere, modulating atmospheric density at altitudes in low Earth orbit and thereby increasing satellite drag and accelerating orbital decay.
Hayato Tanaka, Takao Nakagawa, Satoshi Nozawa, Toru Tamagawa, Teruaki Enoto, Takao Kitaguchi, Wataru Iwakiri, Tatehiro Mihara, Tomoshi Takeda, Naoyuki Ota, Amira Aoyama, Satoko Iwata, Takuya Takahashi, Kaede Yamasaki   +13 more
doaj   +1 more source

Quasi‐Homologous Solar Flares and Impacts on Thermospheric Density and Satellite Orbital Drag

Geophysical Research Letters, Volume 53, Issue 20, 28 October 2026.
Abstract Quasi‐Homologous Flaring (QHF) activity from active regions on the Sun releases intense electromagnetic radiation in recurrent bursts over extended periods. In this letter, we present the effects of recurrent impulsive extreme ultraviolet (EUV) heating on thermospheric neutral density and the resulting atmospheric drag on satellites based on ...
S. Tulasi Ram, Princy K. Dubey, S. Mondal, Denny M. Oliveira, Jayashree Bulusu, Chinmaya Nayak, D. Rout, Anil Raghav, A. P. Dimri   +8 more
wiley   +1 more source

Broadband extreme ultraviolet interferometry and imaging [PDF]

, 2019
Using a pair of phase-locked high-harmonic generation sources, we demonstrate Fourier transform interferometry at extreme-ultraviolet (EUV) wavelengths between 17 and 55 nm.
Matthijs Jansen, de Beurs, Anne, Liu Kevin, de Beurs Anne, Eikema, Kjeld, Anne de Beurs, Jansen, Matthijs, Witte, Stefan, Stefan Witte, Witte Stefan, Kevin Liu, Jansen Matthijs, Eikema Kjeld, Liu, Kevin; id_orcid, Kjeld Eikema   +14 more
core   +2 more sources

Laboratory-based EUV spectroscopy for the characterization of thin films, membranes and nanostructured surfaces

, 2022
Paper 111471X, 6 S.The authors present studies on laboratory-based spectroscopy in the extreme ultraviolet (EUV) performed on a variety of thin film materials.
Ghafoori, Moein, Loosen, Peter, Danylyuk, Serhiy, Stollenwerk, Jochen, Brose, Sascha, Glabisch, Sven, Bahrenberg, Lukas   +6 more
core   +1 more source

Astronomy & Astrophysics (CAUCASUS)-VOLUME 4

, 2018
The IV volume of Journal “Astronomy & Astrophysics (Caucasus)” was dedicated to the 110th Anniversary of Academician Victor Hambardzumyan. AcademicianVictor Hambardzumyan President of International Union of Astronomy (in 1961 – 1964 and 1966 – 72 ...
(CAUCASUS), Astronomy & Astrophysics
core   +1 more source

The Impact of Enhanced Extreme-ultraviolet Flux on the Upper Atmosphere of Earth-like Exoplanets

The Astrophysical Journal
Identifying Earth-like planets outside our solar system is a leading research goal in astronomy, but determining if candidate planets have atmospheres, and more importantly if they can retain atmospheres, is still out of reach.
Lukas Hanson, Ofer Cohen, Aaron J. Ridley, Alex Glocer   +3 more
doaj   +1 more source

Ultra‐Weak Photon Emission as a By‐Product of Mitochondrial Oxidative Metabolism: Mechanisms, Limits, and Implications

Nanophotonics, Volume 15, Issue 20, 27 October 2026.
Mitochondrial oxidative metabolism generates ROS. Downstream chemiexcitation triplet carbonyls, singlet oxygen; produces ultra‐weak photon emission (UPE). Energetic bounds restrict well‐coupled respiration to extremely weak, red/NIR‐biased emission. Stronger visible UPE indicates elevated oxidative flux, linking measured photon counts to redox state ...
Samuel Crowther, Alice Attenborough, Frank Vollmer   +2 more
wiley   +1 more source