Results 71 to 80 of about 2,273 (184)

A model for heating the super-hot corona in solar active regions

Nature Astronomy
What physical mechanisms heat the outer solar or stellar atmosphere to million-Kelvin temperatures is a fundamental but long-standing open question. In particular, the solar corona in active region cores contains an even hotter component reaching ten million Kelvin, manifesting as persistent coronal loops in extreme ultraviolet and soft X-ray images ...
Zekun Lu, Feng Chen, M. D. Ding, Can Wang, Yu Dai, Xin Cheng   +5 more
openaire   +2 more sources

A Double-decker Flux Rope Model for the Solar Eruption on 2012 March 10

The Astrophysical Journal
We present a magnetic configuration of a compound solar eruption observed on 2012 March 10, from NOAA AR 11429 near the disk center, which displayed a soft X-ray sigmoid before the eruption.
Nishu Karna, Suman Dhakal, Antonia Savcheva, Jie Zhang, Bernhard Kliem   +4 more
doaj   +1 more source

Exploring the Coronal Magnetic Field with Galactic Cosmic Rays: The Sun Shadow Observed by HAWC

The Astrophysical Journal
Galactic cosmic rays (GCRs) are charged particles that reach the heliosphere almost isotropically in a wide energy range. In the inner heliosphere, the GCR flux is modulated by solar activity so that only energetic GCRs reach the lower layers of the ...
R. Alfaro, C. Alvarez, J. C. Arteaga-Velázquez, K. P. Arunbabu, D. Avila Rojas, R. Babu, E. Belmont-Moreno, K. S. Caballero-Mora, T. Capistrán, A. Carramiñana, S. Casanova, P. Colín-Farias, U. Cotti, J. Cotzomi, S. Coutiño de León, E. De la Fuente, C. de León, D. Depaoli, R. Diaz Hernandez, J. C. Díaz-Vélez, M. Durocher, M. A. DuVernois, K. Engel, C. Espinoza, K. L. Fan, N. Fraija, J. A. García-González, F. Garfias, A. Gonzalez Muñoz, M. M. González, J. A. Goodman, J. P. Harding, D. Huang, F. Hueyotl-Zahuantitla, A. Iriarte, S. Kaufmann, A. Lara, J. Lee, H. León Vargas, A. L. Longinotti, G. Luis-Raya, K. Malone, O. Martinez, J. Martínez-Castro, J. A. Matthews, P. Miranda-Romagnoli, E. Moreno, M. Mostafá, A. Nayerhoda, L. Nellen, T. Niembro, R. Noriega-Papaqui, N. Omodei, E. G. Pérez-Pérez, C. D. Rho, D. Rosa-González, E. Ruiz-Velasco, J. Ryan, H. Salazar, D. Salazar-Gallegos, A. Sandoval, J. Serna-Franco, A. J. Smith, Y. Son, R. W. Springer, O. Tibolla, K. Tollefson, I. Torres, R. Turner, F. Ureña-Mena, E. Varela, L. Villaseñor, X. Wang, I. J. Watson, E. Willox, S. Yun-Cárcamo, H. Zhou   +76 more
doaj   +1 more source

Recurrent Jetlets Associated with the Disappearance of a Satellite Spot

The Astrophysical Journal
Recurrent small-scale eruptions are fascinating phenomena in the solar atmosphere, characterized by repeated energy buildup and release over short time intervals. However, their underlying physical mechanisms remain unclear.
Liheng Yang, Xiaoli Yan, Jun Zhang, Zhike Xue, Zhe Xu, Jincheng Wang, Yijun Hou, Yian Zhou, Defang Kong, Roslan Umar, Xinsheng Zhang, Qiaoling Li, Liping Yang   +12 more
doaj   +1 more source

Waiting Time Distribution of Supra-arcade Downflows

The Astrophysical Journal Letters
Supra-arcade downflows (SADs) are dark, sunward-moving structures above the arcade of flare loops. Naturally, they are considered to be associated with outflows resulting from magnetic reconnection at the vertical current sheet beneath the eruptive ...
Zichao Yang, Rui Liu
doaj   +1 more source

Properties of Slow Magnetoacoustic Waves Observed Simultaneously Using Hi-C 2.1 and AIA

The Astrophysical Journal
Propagating slow magnetoacoustic waves are commonly observed in different coronal structures but are most prominent in active region fan loops. Their rapid damping with damping lengths of the order of a wavelength has been investigated in the past by ...
Suraj K. Tripathy, S. Krishna Prasad, D. Banerjee   +2 more
doaj   +1 more source

Temporal Behavior and Latitudinal Relationships between Key Solar Parameters and Green Line Emissions in the Solar Corona

The Astrophysical Journal Letters
Understanding the link between solar parameters and their influence on green line emissions would help unravel the complexities of eruptive phenomena within the solar corona. This study explores the intricate relationship between green line emissions and
Jacob Oloketuyi, Yu Liu, Linhua Deng, Abouazza Elmhamdi, Khaled Nasser Almosabeh, Fengrong Zhu, Haitang Li, Feiyang Sha, Qiang Liu, Oladipo Emmanuel Abe, Charles Owolabi, Olufemi Olusola   +11 more
doaj   +1 more source

Modelling the total solar eclipse in 2024 with COCONUT

Astronomy & Astrophysics
Context. Coronal modelling is crucial for a better understanding of solar physics and heliophysics. Accurate plasma conditions at the outer boundary of a solar corona lead to more precise space weather predictions.
Baratashvili T., Wang H. P., Sorokina D., Lani A., Poedts S.   +4 more
doaj   +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

A Near-half-century Simulation of the Solar Corona

The Astrophysical Journal Letters
We present an overview of results from a magnetofrictional model of the entire solar corona over a period of 47 yr. The simulation self-consistently reproduces decades of solar phenomena, varying in duration between rapid eruptions and the long-term ...
Valentin Aslanyan, Karen A. Meyer, Roger B. Scott, Anthony R. Yeates   +3 more
doaj   +1 more source