The evolution of a spot–spot-type solar active region which produced a major solar eruption by Lijuan Liu, Lijuan Liu, Lijuan Liu

“…The bipoles were arranged in parallel on the photosphere, shown as two clusters of sunspots with opposite-sign polarities, so that the AR exhibited an overall large bipole configuration. …”
Get full text

Numerical Simulation of Solar Magnetic Flux Emergence Using the AMR–CESE–MHD Code by Zhipeng Liu, Chaowei Jiang, Xueshang Feng, Pingbing Zuo, Yi Wang

“…Meanwhile, two gradually separated polarity concentration zones appear in the photospheric layer, transporting the magnetic field and energy into the atmosphere through their vortical and shearing motions. …”
Get full text

Confinedness of an X3.1-class Solar Flare Occurred in NOAA 12192: Analysis from Multi-instrument Observations by N. Vasantharaju, F. Zuccarello, F. Ferrente, S. L. Guglielmino

“…The decrease of net fluxes in the brightening regions near the footpoints of the multisigmoidal AR in the photosphere and chromosphere, indicative of flux cancellation favoring tether-cutting reconnection (TCR), is observed using the magnetic field observations of HMI/SDO and SOT/Hinode, respectively. …”
Get full text

Chromospheric thermodynamic conditions from inversions of complex Mg II h & k profiles observed in flares by Alberto Sainz Dalda, Alberto Sainz Dalda, Bart De Pontieu, Bart De Pontieu, Bart De Pontieu

“…The former have mainly focused on the corona, while the latter have mostly been used to investigate the conditions in the chromosphere and photosphere. The Interface Region Imaging Spectrograph (IRIS) instrument has served as a gateway between these two cases, given its capability to observe quasi-simultaneously the corona, the transition region, and the chromosphere using different spectral lines in the near- and far-ultraviolet ranges. …”
Get full text

4FGL J1318.2+6754: A Long Orbital-period Redback Candidate by Jie Lin, Hailiang Chen, Bojun Wang, Renxin Xu

“…The light curve in the T band reveals periodic modulation of low amplitude that is a characteristic feature of the heating of the photosphere of a nondegenerate low-mass stellar companion by the pulsar wind. …”
Get full text

GRB 191019A: A Short Gamma-Ray Burst in Disguise from the Disk of an Active Galactic Nucleus by Davide Lazzati, Rosalba Perna, Benjamin P. Gompertz, Andrew J. Levan

“…The double-peaked light curve carries the telltale features predicted for GRBs in high-density media, where the first peak is produced by the photosphere and the second by the overlap of reverse shocks that take place before the internal shocks could happen. …”
Get full text

X-Ray Activity Variations and Coronal Abundances of the Star–Planet Interaction Candidate HD 179949 by Anshuman Acharya, Vinay L. Kashyap, Steven H. Saar, Kulinder Pal Singh, Manfred Cuntz

“…We find a low coronal abundance A (Fe)/ A H) ≈ 0.2 relative to the solar photospheric baseline of Anders & Grevesse, and significantly lower than the stellar photosphere as well. …”
Get full text

ExoPhot: The Photon Absorption Rate as a New Metric for Quantifying the Exoplanetary Photosynthetic Activity Fitness by Pablo Marcos-Arenal, Luis Cerdán, Mercedes Burillo-Villalobos, Nuria Fonseca-Bonilla, Juan García de la Concepción, María Ángeles López-Cayuela, Felipe Gómez, José A. Caballero

“…In order to address these goals, we make use of a new metric, the absorption rate <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi>γ</mi></semantics></math></inline-formula>, for the evaluation of the exoplanet photosynthetic activity that, based on state-of-the-art planet atmosphere and stellar photosphere spectroscopic models, quantifies the overlap between those models with the absorption spectra of photosynthetic pigments, both terrestrial and theoretical. …”
Get full text

Deep Learning–based Solar Flare Forecasting Model. III. Extracting Precursors from EUV Images by Dezhi Sun, Xin Huang, Zhongrui Zhao, Long Xu

“…Previous studies have demonstrated the importance of the photospheric magnetic field in the occurrence of flares. …”
Get full text

Coronal Abundances in an Active Region: Evolution and Underlying Chromospheric and Transition Region Properties by Paola Testa, Juan Martínez-Sykora, Bart De Pontieu

“…The element abundances in the solar corona and solar wind are often different from those of the solar photosphere, typically with a relative enrichment of elements with low first ionization potential (FIP effect). …”
Get full text

Modeling the Magnetic Field of the Inner Corona in a Radially Expanding Solar Wind by Andrey G. Tlatov, Ivan Berezin

“…The magnetic field in the interplanetary medium is formed by the action of magnetic field sources on the photosphere of the Sun and currents in the expanding atmosphere of the Sun and the solar wind. …”
Get full text

Magnetic Fields and Plasma Heating in the Sun’s Atmosphere by P. Judge, L. Kleint, R. Casini, A. G. de Wijn, T. Schad, A. Tritschler

“…Inouye Solar Telescope to track magnetic connections from the solar photosphere into the corona. We scrutinize relationships between chromospheric magnetism and bright chromospheric, transition region, and coronal plasmas. …”
Get full text

Scale and Time Dependence of Alfvénicity in the Solar Wind as Observed by the Parker Solar Probe by Panisara Thepthong, Peera Pongkitiwanichakul, David Ruffolo, Rungployphan Kieokaew, Riddhi Bandyopadhyay, William H. Matthaeus, Tulasi N. Parashar

“…These results are consistent with a picture in which Alfvénic fluctuations generated near the photosphere transport outward, forming highly Alfvénic states in the young solar wind, and subsequent interactions with large-scale structures and gradients lead to weaker Alfvénicity, as commonly observed at larger heliocentric distances.…”
Get full text

Simulation of a Solar Jet Formed from an Untwisting Flux Rope Interacting with a Null Point by Jiahao Zhu, Yang Guo, Mingde Ding, Brigitte Schmieder

“…One structure outlines a flux rope lying low above the photosphere in the north of a bald patch region, and the other structure shows a null point high in the corona in the south. …”
Get full text

The solar red-shift by Higgs, L

“…Adam in 1948 showed that, assuming known photospheric conditions, unreasonably large convective velocities were required for such an interpretation.…”

Locating Heating Channels of the Solar Corona in a Plage Region with the Aid of High-resolution 10830 Å Filtergrams by Parida Hashim, Fangyu Xu, Ya Wang, Weijie Meng, Jinhua Shen, Yingna Su, Jianping Li, Zhenyu Jin, Haisheng Ji

“…In this paper, with a set of high-resolution He i 10830 Å filtergrams, we select an area in a plage, very likely an extreme-ultraviolet (EUV) moss area, as an interface layer to follow the clues of coronal heating channels down to the photosphere. The filtergrams are obtained from the 1 m aperture New Vacuum Solar Telescope. …”
Get full text

Solar-MACH: An open-source tool to analyze solar magnetic connection configurations by Jan Gieseler, Nina Dresing, Christian Palmroos, Johan L. Freiherr von Forstner, Johan L. Freiherr von Forstner, Daniel J. Price, Rami Vainio, Athanasios Kouloumvakos, Laura Rodríguez-García, Domenico Trotta, Vincent Génot, Arnaud Masson, Markus Roth, Astrid Veronig

“…In close vicinity of the Sun, a Potential Field Source Surface (PFSS) model can be applied to connect the HMF to the solar photosphere. Solar-MACH is especially aimed at providing publication-ready figures for the analyses of Solar Energetic Particle events (SEPs) or solar transients such as Coronal Mass Ejections (CMEs). …”
Get full text

The Inner Disk Rim of HD 163296: Linking Radiative Hydrostatic Models with Infrared Interferometry by Ondřej Chrenko, Mario Flock, Takahiro Ueda, Antoine Mérand, Myriam Benisty, Raúl O. Chametla

“…We find that when the cooling efficiency is reduced, the infrared photosphere at the rim becomes hotter, leading to an increase in R _hl sufficient to match the observations. …”
Get full text

Magnetohydrodynamic Poynting Flux Vortices in the Solar Atmosphere and Their Role in Concentrating Energy by Suzana S. A. Silva, Gary Verth, Erico L. Rempel, Istvan Ballai, Shahin Jafarzadeh, Viktor Fedun

“…This energy mapping reveals the presence of transport barriers in the lower atmosphere, restricting the amount of magnetic energy from the photosphere reaching the chromosphere and corona. Interacting kinematic and magnetic vortices create energy channels, breaking through these barriers and allowing three times more energy input from photospheric motions to reach the upper atmosphere than before the vortices formed. …”
Get full text

High-resolution Spectroscopy of SN 2023ixf’s First Week: Engulfing the Asymmetric Circumstellar Material by Nathan Smith, Jeniveve Pearson, David J. Sand, Ilya Ilyin, K. Azalee Bostroem, Griffin Hosseinzadeh, Manisha Shrestha

“…We find that CSM lines disappear after a few days because the asymmetric CSM is engulfed by the supernova photosphere.…”
Get full text