Results 41 to 50 of about 1,066 (184)
Solar Vortex Detection with Velocity Field Normalization: Eliminating False Positives
The Astrophysical JournalSmall-scale vortices in the solar photosphere play a central role in transporting mass, energy, and momentum into the upper solar atmosphere, yet reliably detecting these structures remains rather challenging.
Lauren McClure +4 more
doaj +1 more source
Coronal heating and wind acceleration by nonlinear Alfvén waves – global simulations with gravity, radiation, and conduction [PDF]
Nonlinear Processes in Geophysics, 2008 We review our recent results of global one-dimensional (1-D) MHD simulations for the acceleration of solar and stellar winds. We impose transverse photospheric motions corresponding to the granulations, which generate outgoing Alfvén waves.
T. K. Suzuki
doaj
Noble gases and nitrogen in material from asteroid Bennu
Meteoritics &Planetary Science, Volume 61, Issue 7, Page 1593-1609, July 2026.Abstract We report the elemental and isotopic abundances of all stable noble gases (helium, neon, argon, krypton, and xenon) in eight particles from asteroid Bennu returned by NASA's OSIRIS‐REx mission. We also report nitrogen abundances and isotopic ratios that were analyzed alongside neon and argon in four additional Bennu particles.
B. Marty +7 more
wiley +1 more source
Quantifying the Impact of Relativistic Precession on Tidal Disruption Event Light Curves
Astronomische Nachrichten, Volume 347, Issue 5, June 2026.ABSTRACT The tidal field of a black hole can turn a star into a gas stream whose orbit can precess, especially if the a black hole is rapidly spinning. In this work, we investigate the impact of precession on the light curves of tidal disruption events (TDE).
Diego Calderón +4 more
wiley +1 more source
High-resolution Observations of a C9.3 White-light Flare and Its Impact on the Solar Photosphere
The Astrophysical Journal LettersWe present a detailed analysis of a C9.3 white-light flare using high-resolution observations from the New Vacuum Solar Telescope. The flare occurred near the eastern solar limb on 2023 September 11, within NOAA AR 13431, and produced beam electrons with
Zhe Xu +6 more
doaj +1 more source
The Nature of Microturbulence in the Solar Photosphere [PDF]
Monthly Notices of the Royal Astronomical Society, 1974 It is shown that the increase in apparent Doppler width as the limb is approached is a natural consequence of the fact that the solar atmosphere is not homogeneous. The work on the sodium D line cores which assumes the solar atmosphere to be homogeneous is reviewed. It appears that the cores of the sodium D lines have been distorted by fluctuations in
A. M. Wilson, F. J. Guidry
openaire +1 more source
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 +11 more
wiley +1 more source
Photospheric Swirls in a Quiet-Sun Region
The Astrophysical JournalSwirl-shaped flow structures have been observed throughout the solar atmosphere, in both emission and absorption, at different altitudes and locations, and are believed to be associated with magnetic structures. However, the distribution patterns of such
Quan Xie +4 more
doaj +1 more source
Diagnostics for propagating waves in the solar photosphere
The Astrophysical Journal, 1986 The effects of pure acoustic waves of several different frequencies are investigated on a number of Fe I lines formed in the photosphere. A dynamical model is used of the waves to compute the line profiles at several different phases of the wave. From the computed profiles, the rms fluctuations in the position and intensity of the profiles are derived ...
KEIL S. L, MARMOLINO, Ciro
openaire +2 more sources
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 +7 more
wiley +1 more source