Results 41 to 50 of about 427 (166)

Structuring of the quiet solar corona [PDF]

Die Aufheizung der Sonnenkorona, der dünnen äußeren Atmosphäre der Sonne, ist seit Jahrzehnten eine der wichtigsten offenen Fragen der Sonnenphysik. Wie das koronale Plasma oberhalb der viel kühleren Photosphäre Millionen von Grad erreicht, hängt eng mit dem Magnetfeld der Sonne zusammen. Das Feld durchdringt die Sonnenatmosphäre und prägt verschiedene
openaire   +1 more source

Stimuli‐Responsive Hydrogels for Optical Applications: Mechanisms, Architectures, and Translational Challenges

Aggregate, Volume 7, Issue 6, June 2026.
The review discusses stimuli‐responsive hydrogels as soft optical materials that translate physical, chemical, and biological cues into refractive‐index, scattering, birefringence, diffraction, and transparency changes. It examines major stimulus classes and photonic architectures for biosensing, waveguiding, adaptive lenses, smart windows, and therapy.
Andrés Bernal‐Ballén, Alexandr Dejneka, Oleg Lunov   +2 more
wiley   +1 more source

Influence of Ionization on the Polytropic Index of the Solar Atmosphere within Local Thermodynamic Equilibrium Approximation

The Astrophysical Journal
An initial theoretical attempt to explain the observed decrease of the polytropic/adiabatic index γ in the solar corona has been accomplished. The chemical reactions of the ionization–recombination processes in local thermodynamic equilibrium (LTE) of a ...
Albert M. Varonov, Todor M. Mishonov
doaj   +1 more source

Association Between Geomagnetic Activity and Unsuccessful Out‐of‐Hospital Cardiac Arrest

GeoHealth, Volume 10, Issue 6, June 2026.
Abstract Out‐of‐hospital cardiac arrests (OHCAs) represent a significant global health challenge, with a survival rate <10%. Recent research has demonstrated that geomagnetic activity (GMA) can disrupt the circadian rhythm. Therefore, GMA may affect patient outcomes after an OHCA event wherein resuscitation is attempted.
Jone Vencloviene, Asta Krikscionaitiene, Linas Darginavicius, Deimante Baksevice, Egle Vaitkaitiene, Dinas Vaitkaitis, Paulius Dobozinskas   +6 more
wiley   +1 more source

Magnetic Topology and Loop Statistics in Observed Coronal Holes Using Potential Field Modeling

The Astrophysical Journal
Potential field source surface (PFSS) models are widely used to study the solar corona and form the basis for solar wind forecasting, yet they often fail to reproduce observed properties of coronal holes.
Stephan G. Heinemann, Jens Pomoell, Manuela Temmer   +2 more
doaj   +1 more source

Comparing Solar Structure Detection Methods in SDO/AIA Observations and the Application to Raw Uncalibrated Data

Journal of Geophysical Research: Machine Learning and Computation, Volume 3, Issue 3, June 2026.
Abstract Recent advances in solar physics increasingly rely on automated identification of coronal structures using machine learning. Yet most studies emphasize scientific performance without evaluating feasibility for onboard deployment to prioritize downlink observations.
P. Gonidakis, F. Carella, E. Dineva, H‐J. Jeong, P. Antunes, A. Podobas, S. Raptis, V. Toy‐Edens, M. Jin, S. Poedts, J. Magdalenic, G. Miloshevich   +11 more
wiley   +1 more source

The Plasma β in Quiet Sun Regions: Multi-instrument View

The Astrophysical Journal
A joint campaign of several spaceborne and ground-based observatories, such as the GREGOR solar telescope, the Extreme-ultraviolet Imaging Spectrometer (EIS), and the Interface Region Imaging Spectrograph (Hinode Observing Plan 381, 2019 October 11–22 ...
Jenny M. Rodríguez-Gómez, Christoph Kuckein, Sergio J. González Manrique, Jonas Saqri, Astrid Veronig, Peter Gömöry, Tatiana Podladchikova   +6 more
doaj   +1 more source

Identifying and Predicting Coronal Mass Ejection Occurrence: Observational Checklists for Space Weather Forecasters

Space Weather, Volume 24, Issue 6, June 2026.
Abstract Ejections of magnetized plasma from the Sun, known as coronal mass ejections, can drive major geomagnetic activity if Earth‐directed, and are therefore monitored by space weather forecasters. The current focus being the forecast of the arrival time of a coronal mass ejection at Earth and the level of geomagnetic impact.
L. M. Green, A. W. James, N. Ngampoopun, S. L. Yardley, K. Waite, E. K. Mottram, J. Hernandez Camero, J. O'kane   +7 more
wiley   +1 more source

How Are the Abnormally Hot Chromosphere and Corona Heated by the Solar Magnetic Fields?

The Astrophysical Journal
The corona is a structure possessed by stars, including the Sun. The abnormal heating of the solar corona and chromosphere is one of the greatest mysteries in modern astronomy.
K. J. Li, J. C. Xu, W. Feng, J. L. Xie, X. J. Shi, L. H. Deng   +5 more
doaj   +1 more source

What Observations Would an Energetic Neutral Atom Imager Have Made During the Voyager 2 Flyby of Uranus?

Journal of Geophysical Research: Space Physics, Volume 131, Issue 6, June 2026.
Abstract We present large‐scale simulations of energetic neutral atom (ENA) emissions at Uranus from a spacecraft viewpoint. Models of magnetic field, extended hydrogen exosphere, moon‐sourced neutral tori, and proton radiation belt are implemented into a simulator to evaluate the production of ENAs for L $L$ = 1–15.
D. Santos‐Costa, N. André
wiley   +1 more source