Results 71 to 80 of about 2,148 (181)

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

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

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

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

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

131 and 304 Å Emission Variability Increases Hours Prior to Solar Flare Onset

The Astrophysical Journal Letters
Thermal changes in coronal loops are well studied, both in quiescent active regions and in flaring scenarios. However, relatively little attention has been paid to loop emission in the hours before the onset of a solar flare; here, we present the ...
Kara L. Kniezewski, E. I. Mason, Vadim M. Uritsky, Seth H. Garland   +3 more
doaj   +1 more source

The Error Estimation of Transverse Coronal Loop Oscillation Parameters Based on Least Chi-squares Fitting

The Astrophysical Journal Supplement Series
Transverse oscillations of coronal loops not only influence coronal dynamics, but also provide a new perspective for coronal detection. To enhance their exploitation and utilization, accurately estimating the oscillation parameters is crucial.
Hongbo Li, Hengqiang Feng, Zhanjun Tian, Qiangwei Cai, Guoqing Zhao, Yan Zhao   +5 more
doaj   +1 more source