Results 91 to 100 of about 8,745 (214)

Identifying Coronal Sources of L1 Solar Wind Disturbances Using the Fisk Heliospheric Magnetic Field and Potential Field Extrapolations during Three Solar Minima

The Astrophysical Journal
The solar minima between solar cycles 22–23, 23–24, and 24–25 are the best observed minima on record. In situ solar wind and interplanetary magnetic field measurements by the Wind and ACE spacecraft at L1 with 1 hr cadence are explored using wavelet ...
P. J. Steyn, D. Johnson, G. J. J. Botha, S. Régnier   +3 more
doaj   +1 more source

Solar and stellar photospheric abundances

Living Reviews in Solar Physics, 2016
The determination of photospheric abundances in late-type stars from spectroscopic observations is a well-established field, built on solid theoretical foundations. Improving those foundations to refine the accuracy of the inferred abundances has proven challenging, but progress has been made.
openaire   +3 more sources

Statistical Investigation of Wave Propagation in the Quiet-Sun Using IRIS Spectroscopic Observations

The Astrophysical Journal
In this analysis, we use spectroscopic observations of the quiet Sun made by the IRIS instrument and investigate wave propagation. We analyze various spectral lines formed in different atmospheric layers, such as the photosphere, chromosphere, and ...
Kartika Sangal, A. K. Srivastava, P. Kayshap, Ding Yuan, E. Scullion   +4 more
doaj   +1 more source

Apparent Photosphere of Massive Accretion-Disk Winds

We examined the observational appearance of highly optically thick winds from supercritical accretion disks, while especially focusing on the shape of a “photosphere“ of the wind. When a massive wind blows from an accretion disk, the optical depth of the
FUKUE, Jun, フクエ, ジュン, ニシヤマ, シンジ, ワタライ, ケンヤ, NISHIYAMA, Shinji, WATARAI, Kenya, 福江, 純   +6 more
core  

Observational Evidence of Vortex-driven Information Transfer in the Solar Atmosphere: Insights from Sunrise iii

The Astrophysical Journal Letters
Using high-resolution observations from the TuMag instrument aboard the Sunrise iii solar observatory balloon mission, we investigate solar vortices in the lower atmosphere.
Suzana S. A. Silva, Ioannis Dakanalis, Kostas Tziotziou, Azaymi L. Siu-Tapia, Shahin Jafarzadeh, Shivdev Singh Turkay, Viktor Fedun, Sami K. Solanki, Andreas Lagg, Achim Gandorfer, Jose Carlos del Toro Iniesta, Yukio Katsukawa, Pietro Bernasconi, Thomas Berkefeld, Alex Feller, Tino L. Riethmüller, Alberto Álvarez-Herrero, Masahito Kubo, Valentín Martínez Pillet, H. N. Smitha, David Orozco Suárez, Bianca Grauf, Michael Carpenter, Alexander Bell, Francisco Javier Bailén, Julian Blanco Rodríguez, Juan Sebastián Castellanos Durán, Edvarda Harnes, Johannes Hoelken, Francisco A. Iglesias, Ryohtaroh T. Ishikawa, Yusuke Kawabata, Takuma Matsumoto, Takayoshi Oba, Hanna Strecker, Dušan Vukadinovic, Maria Balaguer Jiménez, Esteban Sanchis Kilders, Ignacio Torralbo, Christoph Kuckein   +39 more
doaj   +1 more source

Fish and flora viewed from the Williamson Photosphere, Bahamas, 1914

, 1914
Fish and flora viewed from the Williamson Photosphere, Bahamas, 1914.

core   +1 more source

Predicting Solar Sigmoid Lifetimes Based on Shearing in the Photosphere [PDF]

, 2015
This project’s purpose was to study how the speed at which the plasma in the photosphere of the sun affects the lifetime and shape of a solar sigmoid. Solar sigmoids are S-shaped, twisted magnetic structures that are due to the shifting magnetic field ...
Stone, Austen
core   +1 more source

The Formation of a Multifilament System Driven by Photospheric Converging Motions in a Bipolar Sunspot

The Astrophysical Journal Letters
Solar filaments are believed to be a clump of cold plasma accumulated in the magnetic dips. However, the magnetic configuration of filaments and the key factors for their formation remains elusive.
Haitang Li, Jinhan Guo, Xin Cheng, Chang Zhou, Xiaoli Yan, Jun Chen, Yang Guo, Jacob Oloketuyi, Mingde Ding, Yu Liu   +9 more
doaj   +1 more source

Case Studies on Pre-eruptive X-class Flares using R-value in the Lower Solar Atmosphere

The Astrophysical Journal
The R -value is a measure of the strength of photospheric magnetic polarity inversion lines in active regions (ARs). This work investigates the possibility of a relation between R -value variations and the occurrence of X-class flares in ARs, not in the ...
Shreeyesh Biswal, Marianna B. Korsós, Manolis K. Georgoulis, Alexander Nindos, Spiros Patsourakos, Robertus Erdélyi   +5 more
doaj   +1 more source

The Schatten current sheet

Frontiers in Astronomy and Space Sciences
Space weather models endeavoring to connect remote observations to in-situ measurements at various locations in the heliosphere invariably require a coronal model to connect the photosphere magnetically to the inner heliosphere.
Kalman J. Knizhnik
doaj   +1 more source