Results 21 to 30 of about 600 (183)
Relationship of Coronal Mass Ejection Events with Solar Flares and coronal Holes [PDF]
Symposium - International Astronomical Union, 1990 We present an analysis of the relationship between coronal mass ejection (CME) events with solar flares and coronal holes. Out of 79 CME events whose location and span are known, 10 CME event circles contain solar flares. On the other hand out of 71 CME events (selected for the study with coronal holes) 40 CME event circles contain coronal holes.
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Geomagnetic storms forecasting from solar coronal holes
Monthly Notices of the Royal Astronomical Society, 2022 <p>Coronal holes (CHs) are the source of high-speed solar wind streams (HSSs), which interact with the slow solar wind and form corotating interaction regions (CIRs) in the heliosphere. These high-speed streams and their associated structures influence the geomagnetic activity, causing recurrent geomagnetic storms. The propagation time of
Simona Nitti +5 more
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Solar-Terrestrial Physics, 2023 We have used data from the space telescope SOHO/EIT and the spectrometer VEIS on the Wind spacecraft to compare the solar wind (SW) speed near Earth's orbit with changes in the area of polar coronal holes (CHs) on the Sun during the 1996 solar activity ...
Borisenko A. V., Bogachev S. A.
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The Astrophysical Journal, 1991 It has been shown that the coronal hole, and the associated high-speed stream in the solar wind, are powered by a heat input of the order of 500,000 ergs/sq cm s, with most of the heat injected in the first 1-2 solar radii, and perhaps 100,000 ergs/sq cm s introduced at distances of several solar radii to provide the high speed of the issuing solar ...
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The Fine-scale Structure of Polar Coronal Holes
The Astrophysical Journal, 2023 Coronal holes are thought to be composed of relatively broad columnar structures known as plumes. Here, we demonstrate that the plumes (and interplumes) in polar coronal holes are composed of fine-scale filamentary structure, with average scales of 2″–10″
R. J. Morton, R. Cunningham
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From Coronal Holes to Pulsars and Back Again: Learning the Importance of Data
Frontiers in Astronomy and Space Sciences, 2022 Although wanting to become an astronomer from an early age, I ended up in solar physics purely by chance, after first working in high-energy astrophysics.
Y.-M. Wang
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Active Region Modulation of Coronal Hole Solar Wind [PDF]
The Astrophysical Journal, 2019 Abstract Active regions (ARs) are a candidate source of the slow solar wind (SW), the origins of which are a topic of ongoing research. We present a case study that examines the processes by which SW is modulated in the presence of an AR in the vicinity of the SW source.
Allan R. Macneil +6 more
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Near‐Earth Solar Wind Speed of Fast Coronal Mass Ejections
Journal of Geophysical Research: Space Physics, Volume 131, Issue 8, August 2026.Abstract Using solar wind and ground magnetometer data for solar cycles 23–25, extreme‐value power‐law models are developed that quantify relationships between near‐Earth solar wind speed and Sun‐to‐Earth transit times of interplanetary coronal mass ejections (ICMEs).
Jeffrey J. Love +3 more
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Magnetic Topology and Loop Statistics in Observed Coronal Holes Using Potential Field Modeling
The Astrophysical JournalPotential field source surface (PFSS) models are widely used to study the solar corona and form the basis for solar wind forecasting, yet they often fail to reproduce observed properties of coronal holes.
Stephan G. Heinemann +2 more
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The Astrophysical Journal Supplement Series, 2023 In this paper, we employ a Harten–Lax–van Leer (HLL) generalized Riemann problem (HLL-GRP) solver within the framework of a finite volume method to model 3D solar coronal structures for the first time.
Mengqing Liu +3 more
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