Results 81 to 90 of about 2,273 (184)

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

Analysis of WISPR Images of the Near-Sun Heliospheric Current Sheet Region from Parker Solar Probe Encounters 4 and 5 and Comparison with the in Situ Observations

The Astrophysical Journal
We present an analysis of Wide-field Imager for Solar PRobe (WISPR) images of the near-Sun heliospheric current sheet (HCS) region from the Parker Solar Probe (PSP) in 2020 January and June.
Paulett C. Liewer, Samuel T. Badman, Mark Linton, T. D. Phan, Guillermo Stenborg, Angelos Vourlidas   +5 more
doaj   +1 more source

Exploring the Origin of Solar Energetic Electrons. II. Investigating Turbulent Coronal Acceleration

The Astrophysical Journal
Nonthermal particle acceleration in the solar corona is evident from both remote hard X-ray sources in the chromosphere and direct in situ detection in the heliosphere.
Ross Pallister, Natasha L. S. Jeffrey, Morgan Stores   +2 more
doaj   +1 more source

The Role of Farside Magnetic Structures in Modeling the 2024 Solar Eclipse

The Astrophysical Journal
The corona is a crucial region that connects the solar surface to the solar wind and serves as the primary site of solar activity. The 2024 total solar eclipse (TSE) provides a unique opportunity to investigate the large-scale coronal structure. Combined
Guanglu Shi, Jiahui Shan, Li Feng, Jun Chen, Weiqun Gan   +4 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

Solar activity cycle variation of the K corona

The Astrophysical Journal, 1984
R. Fisher, D. G. Sime
openaire   +1 more source

Secular variations in the solar corona shape according to observations during a solar activity minimum epoch

, 2008
Analysis of the solar corona structure during the periods of minimum solar activity from 1867 till 2006 has been carried out. A new flattening index for the large coronal streamers has been proposed. It has been shown that the index has been smoothly changing during the last 140 years.
openaire   +2 more sources

Solar Doppler Velocity Results from the SDO EVE Level 4 Lines Data Product. [PDF]

Sol Phys
Woods TN, Chamberlin PC, Crotser D, Jones A, Borelli R, Woodraska D, Gonzalez G.   +6 more
europepmc   +1 more source

The Behaviour of the EUV Corona Before Flares in Regions with High Free Magnetic Energy. [PDF]

Sol Phys
Harra L, Kusano K, Zhu Y, Barczynski K, De-Sassi A, Stiefel MZ, Kontogiannis I, West MJ, Brooks DH.   +8 more
europepmc   +1 more source

Potential Solar Precursors to Magnetic Switchbacks. [PDF]

Space Sci Rev
Tripathi D, Madjarska MS, Karpen J, Velli M, Froment C, Pariat E, Patsourakos S, Raouafi NE, Rouillard AP, Sterling AC, Tziotziou K, Wyper PF.   +11 more
europepmc   +1 more source