Results 121 to 130 of about 2,470 (205)

Quantitative Image-based Validation Framework for Assessing Global Coronal Magnetic Field Models

The Astrophysical Journal
Coronagraph observations provide key information about the orientation of the Sun’s magnetic field. Previous studies used various algorithms to segment quasi-radial features in coronagraph images and approximate their local plane-of-sky (POS) geometry ...
Christopher E. Rura, Vadim M. Uritsky, Shaela I. Jones, Cooper Downs, Charles Nickolos Arge, Nathalia Alzate   +5 more
doaj   +1 more source

Features of the Sun [PDF]

In this activity students study various features of the Sun in order to understand how the Sun varies. Students will learn that the Sun contains many complex features and compare this to their own prior knowledge about the Sun.
Beverly Meier
core  

The evolution of the solar wind. [PDF]

Living Rev Sol Phys, 2021
Vidotto AA.
europepmc   +1 more source

Cross Helicity and the Helium Abundance as an In Situ Metric of Solar Wind Acceleration

The Astrophysical Journal Letters
The two-state solar wind paradigm is based on observations showing that slow and fast solar wind have distinct properties like helium abundances, kinetic signatures, elemental composition, and charge-state ratios. Nominally, the fast wind originates from
B. L. Alterman, Raffaella D’Amicis
doaj   +1 more source

Wave speeds in the corona and the dynamics of mass ejections [PDF]

A disturbance or coronal mass ejection being advected by the solar wind will expand at the fastest local characteristic speed - typically approximately the fast-mode speed.
Moore, R. L., Suess, S. T.
core   +1 more source

Development of a local empirical model of ionospheric total electron content (TEC) and its application for studying solar-ionospheric effects. [PDF]

Sci Rep, 2021
Davoudifar P, Tabari KR, Shafigh AAE, Ajabshirizadeh A, Bagheri Z, Akbarian Tork Abad F, Shayan M.   +6 more
europepmc   +1 more source

A Model for Flux Rope Formation and Disconnection in Pseudostreamer Coronal Mass Ejections

The Astrophysical Journal
Coronal mass ejections (CMEs) from pseudostreamers represent a significant fraction of large-scale eruptions from the Sun. In some cases, these CMEs take a narrow jet-like form reminiscent of coronal jets; in others, they have a much broader fan-shaped ...
P. F. Wyper, B. J. Lynch, C. R. DeVore, P. Kumar, S. K. Antiochos, L. K. S. Daldorff   +5 more
doaj   +1 more source

Statistics of blob properties in two types of coronal streamers

Astronomy & Astrophysics
Context. Previous studies have shown that a streamer blob might originate in the lower corona and thus be affected by activity in that region. While the base of one streamer might differ from that of another, it can be cataloged into two distinct types ...
Li Haiyi, Huang Zhenghua, Madjarska Maria S., Qi Youqian, Fu Hui, Xiong Ming, Xia Lidong   +6 more
doaj   +1 more source

Nine Outstanding Questions of Solar Wind Physics. [PDF]

J Geophys Res Space Phys, 2020
Viall NM, Borovsky JE.
europepmc   +1 more source

Forward Modeling of Dust-induced Stray Light in Ground-based Coronagraphs: A Dual-path Monitoring Approach for High-precision Inner Corona Observations

The Astrophysical Journal
High-precision ground-based observations of the inner corona (1.05–2.0 R _⊙ ) are fundamentally constrained by instrumental stray light, particularly the additive background from dynamic dust accumulation on the objective lens.
Xiande Liu, Xuefei Zhang, Yu Liu, Tengfei Song, Mingyu Zhao, Mingzhe Sun, Feiyang Sha, Jun Fang   +7 more
doaj   +1 more source