Results 61 to 70 of about 14,596 (161)

Interchange reconnection as the source of the fast solar wind within coronal holes. [PDF]

Nature, 2023
Bale SD, Drake JF, McManus MD, Desai MI, Badman ST, Larson DE, Swisdak M, Swisdak M, Horbury TS, Raouafi NE, Phan T, Velli M, McComas DJ, Cohen CMS, Mitchell D, Panasenco O, Kasper JC.   +16 more
europepmc   +1 more source

Rotational Characteristics of Coronal Holes [PDF]

Symposium - International Astronomical Union, 1976
From May 1972 to October 1973, daily measures were obtained of EUV coronal hole areas appearing at the central meridian. Autocorrelations of these coronal hole area time series provide synodic rotation periods which indicate an almost rigid rotation by such features for lag lengths as short as one rotation. The rotation periods of coronal holes at high
openaire   +1 more source

Field-aligned currents are strongly modulated by corotating solar wind high-speed streams

Journal of Space Weather and Space Climate
Birkeland field-aligned currents (FACs) are associated with solar wind-magnetosphere energy coupling leading to substorms/convection events. FAC intensity enhancements have been studied during geomagnetic storms driven by interplanetary coronal mass ...
Hajra Rajkumar, Tsurutani Bruce T., Franco Adriane M. S., Lu Quanming, Du Aimin, Lakhina Gurbax S., Lu San, Gao Xinliang, Echer Ezequiel   +8 more
doaj   +1 more source

Quantifying the Consistency and Characterizing the Confidence of Coronal Holes Detected by Active Contours Without Edges (ACWE). [PDF]

Sol Phys, 2023
Grajeda JA, Boucheron LE, Kirk MS, Leisner A, Arge CN.   +4 more
europepmc   +1 more source

Fast X-Ray Variability from the Coronae of Supermassive Black Holes

The Astrophysical Journal Letters
We present the first systematic study of short-timescale X-ray variability in radio-quiet active galactic nuclei (AGN), utilizing archival Chandra observations of approximately 3000 broad-line AGN selected from the Sloan Digital Sky Survey and Dark ...
Xiurui Zhao, Luca Comisso, Stefano Marchesi, Marco Ajello, Elias Kammoun, Yue Shen, Qiaoya Wu   +6 more
doaj   +1 more source

Observations of coronal holes with the Siberian Radioheliograph

Solar-Terrestrial Physics
Multi-wavelength observations of a coronal hole (CH) with two-dimensional spatial resolution have been made for the first time in the frequency range from 2.8 to 12 GHz.
Globa M. V., Meshalkina N. S., Sych R. A.   +2 more
doaj   +1 more source

Probing Upflowing Regions in the Quiet Sun and Coronal Holes. [PDF]

Sol Phys, 2021
Schwanitz C, Harra L, Raouafi NE, Sterling AC, Moreno Vacas A, Del Toro Iniesta JC, Orozco Suárez D, Hara H.   +7 more
europepmc   +1 more source

Elemental Abundances at Coronal Hole Boundaries as a Means to Investigate Interchange Reconnection and the Solar Wind

The Astrophysical Journal
The origin of the slow solar wind is not well understood, unlike the fast solar wind that originates from coronal holes. In situ elemental abundances of the slow solar wind suggest that it originates from initially closed field lines that become open ...
Alexandros Koukras, Daniel W. Savin, Michael Hahn   +2 more
doaj   +1 more source

Automated coronal hole identification via multi-thermal intensity segmentation

Journal of Space Weather and Space Climate, 2018
Coronal holes (CH) are regions of open magnetic fields that appear as dark areas in the solar corona due to their low density and temperature compared to the surrounding quiet corona.
Garton Tadhg M., Gallagher Peter T., Murray Sophie A.   +2 more
doaj   +1 more source

Microwave Bright Points with Multiple Periodic Oscillations in the Solar Polar Coronal Hole during Solar Cycle Minimum

The Astrophysical Journal
During solar cycle minimum, polar coronal holes show a prominent radio brightening cap. The analysis of polar microwave enhanced radiation in polar coronal holes is helpful for understanding the magnetic field characteristics and the origin of the solar ...
Jing Huang, Satoshi Masuda, Baolin Tan, Yin Zhang, Shangbin Yang, Shuhong Yang, Yuanyong Deng   +6 more
doaj   +1 more source