Results 11 to 20 of about 293,183 (281)
Coronal Cells in Coronal Holes: Systematic Analysis and Implications for Coronal Evolution
The Astrophysical JournalUsing advanced processing techniques, we analyze high-cadence, high-resolution extreme-ultraviolet images and show that, throughout the solar cycle, midlatitude coronal holes (CHs) are made up of ubiquitous and space-filling funnel-shaped structures (or ...
Nathalia Alzate +2 more
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The Geometric Spreading of Coronal Plumes and Coronal Holes [PDF]
Solar Physics, 1998 The geometric spreading in plumes and in the interplume region in coronal holes is calculated, using analytic and numerical theoretical models, between 1.0 and 5.0 solar radius. We apply a two-scale approximation that permits the rapid local spreading at the base of plumes (f(sub t)) to be evaluated separately from the global spreading (f(sub g ...
S. T. Suess +4 more
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The impact of coronal hole characteristics and solar cycle activity in reconstructing coronal holes with EUHFORIA [PDF]
Journal of Physics: Conference Series, 2020 Abstract Modelling with high accuracy the open magnetic field and the fast solar wind in the heliosphere is essential for space weather forecasting purposes. Primary sources of open magnetic field flux are Coronal Holes (CH), uni-polar regions that appear as dark patches in the solar corona when observed in X-ray and extreme-ultraviolet (
Asvestari, E. +6 more
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Coronal and Chromospheric Dynamics of a Coronal Hole Bright Point
The Astrophysical JournalData from the Atmospheric Imaging Assembly (AIA) and the Helioseismic Magnetic Imager on board the Solar Dynamics Observatory and from the Interface Region Imaging Spectograph, are used to study the evolution at different atmospheric layers of a bright ...
Ana Cristina Cadavid, Mari Paz Miralles
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, 2009 The fast solar wind originates from polar coronal holes. Recent observations from SoHO suggest that the solar wind is flowing from funnel-shaped magnetic fields anchored in the lanes of the magnetic network at the solar surface. Using the spectroscopic diagnostic capability of SUMER on SoHO and of EIS on HINODE, we study waves in polar coronal holes ...
Banerjee, D., D. Banerjee
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Coronal Holes and Open Magnetic Flux over Cycles 23 and 24. [PDF]
Sol Phys, 2017 As the observational signature of the footprints of solar magnetic field lines open into the heliosphere, coronal holes provide a critical measure of the structure and evolution of these lines.
Lowder C, Qiu J, Leamon R.
europepmc +3 more sources
Dynamics of Coronal Hole Boundaries [PDF]
The Astrophysical Journal, 2017 Abstract Remote and in situ observations strongly imply that the slow solar wind consists of plasma from the hot, closed-field corona that is released onto open magnetic field lines. The Separatrix Web theory for the slow wind proposes that photospheric motions at the scale of supergranules are responsible for generating dynamics at ...
A. K. Higginson +4 more
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Development of Coronal Holes Index For Study of Coronal Hole Geo-Effectiveness
Journal of Physics: Conference Series, 2022 Abstract Coronal holes are expansion regions in the solar corona with lower density and temperature than their surroundings. Coronal holes have open magnetic field structure that radiates out into interplanetary space as the solar wind.
Anwar Santoso +5 more
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Characteristics of Ephemeral Coronal Holes [PDF]
The Astrophysical Journal, 2019 Abstract Small-scale ephemeral coronal holes may be a recurring feature on the solar disk but have received comparatively little attention. These events are characterized by compact structures and short total lifetimes, which are substantially less than a solar disk crossing.
A. R. Inglis +4 more
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Magnetic Flux Emergence in a Coronal Hole [PDF]
Solar Physics, 2020 A joint campaign of various space-borne and ground-based observatories, comprising the Japanese Hinode mission (HOP~338, 20\,--\,30~September 2017), the GREGOR solar telescope, and the \textit{Vacuum Tower Telescope} (VTT), investigated numerous targets such as pores, sunspots, and coronal holes.
Judith Palacios +15 more
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