Results 71 to 80 of about 1,371 (185)

Formation of a Magnetic Flux Rope prior to the Eruption: Insight from a Radiative MHD Simulation of Active Region Emergence

The Astrophysical Journal Letters
Magnetic flux ropes are fundamental magnetic structures in solar eruptions, whose formation is generally attributed to: (1) the emergence of subsurface flux tubes; or (2) flux cancellation driven by photospheric horizontal flows and magnetic reconnection.
Can Wang, Takaaki Yokoyama, Feng Chen, Chen Xing, Mingde Ding, Zekun Lu   +5 more
doaj   +1 more source

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

Assessment of DKIST/VTF capabilities for the detection of local acoustic source wavefronts

Frontiers in Astronomy and Space Sciences
IntroductionRecent studies have demonstrated that temporal filtering can successfully identify local acoustic source wavefronts in radiative magnetohydrodynamic simulations of the solar photosphere.
Corinne Morrell, Corinne Morrell, Mark P. Rast, Mark P. Rast, Shah Mohammad Bahauddin, Shah Mohammad Bahauddin, Ivan Milić   +6 more
doaj   +1 more source

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

Derivation and Application of a Scaling between Hinode/SP and SDO/HMI Vector Magnetic Fields to Improve Magnetic Field Extrapolations

The Astrophysical Journal
Full-disk measurements of the solar magnetic field by the Helioseismic and Magnetic Imager (HMI) are often used for magnetic field extrapolations, but its limited spatial and spectral resolution can lead to significant errors.
C. Beck, A. Prasad, Q. Hu, M. S. Yalim, S. Gosain, D. Prasad Choudhary   +5 more
doaj   +1 more source

Study on the relation of the solar coronal rotation with magnetic field structures. [PDF]

Sci Rep, 2023
Xiang NB, Zhao XH, Deng LH, Li FY, Zheng S.   +4 more
europepmc   +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

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

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

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