Results 21 to 30 of about 14,596 (161)
Antarctic Record, 1980 This is an attempt to identify the causes of geomagnetic storms which occurred during a year and a half from January 1977 to June 1978. The assignment of geomagnetic storm causation to appropriate coronal holes or solar flares has been made by ...
Katsuhide MARUHASHI, Takahiroo ISHI
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Estimating Ion Temperatures at the Polar Coronal Hole Boundary
The Astrophysical Journal, 2023 The temperatures of the heavy ions ( T _i ) in the solar corona provide critical information about the heating mechanism of the million-degree corona.
Yingjie Zhu, Judit Szente, Enrico Landi
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Coronal Hole Properties Observed with SUMER
Space Science Reviews, 1999 We analyze SUMER spectra of 14 lines belonging to 12 ions, obtained on both sides of the boundary of polar coronal holes as well as at other locations along the limb. We compare line intensities, shifts and widths in coronal holes with values obtained in the quiet Sun.
Stucki, K. +7 more
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MAGNETIC TOPOLOGY OF CORONAL HOLE LINKAGES [PDF]
The Astrophysical Journal, 2011 32 pages, 10 figures, accepted to ...
Titov, V. S. +4 more
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Chromosphere Activity Relation with Solar Dynamo Magnetic Activity Cycle [PDF]
Iranian Journal of Astronomy and Astrophysics, 2022 In this article, we analyzed the abnormal thickness of the chromosphere above the coronal holes (CH) at the poles of the Sun for 13 years (2010-2022), on the 15th of every month, by using AIA/SDO telescope data.
Ehsan Tavabi, Mina Rajabi, Sima Zeighami
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Australian Journal of Physics, 1983 The dynamics of high speed streams of solar plasma emanating from a coronal hole is investigated by use of a two-fluid model with polytropic equations of state. Steady outflow is considered along a flow tube which has a radial orientation with respect to the Sun, and a cross-sectional area proportional to r' where r is the heliocentric radius and s is ...
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Topologically driven coronal dynamics – a mechanism for coronal hole jets [PDF]
Annales Geophysicae, 2008 Abstract. Bald patches are magnetic topologies in which the magnetic field is concave up over part of a photospheric polarity inversion line. A bald patch topology is believed to be the essential ingredient for filament channels and is often found in extrapolations of the observed photospheric field.
D. A. N. Müller, S. K. Antiochos
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The Merging of a Coronal Dimming and the Southern Polar Coronal Hole
The Astrophysical Journal, 2023 Abstract We report on the merging between the southern polar coronal hole and an adjacent coronal dimming induced by a coronal mass ejection on 2022 March 18, resulting in the merged region persisting for at least 72 hr. We use remote sensing data from multiple co-observing spacecraft to understand the physical processes during this ...
Nawin Ngampoopun +6 more
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Empirical Forecast of Corotating Interacting Regions and Geomagnetic Storms Based on Coronal Hole Information [PDF]
Journal of Astronomy and Space Sciences, 2009 In this study, we suggest an empirical forecast of CIR (Corotating Interaction Regions) and geomagnetic storm based on the information of coronal holes (CH). For this we used CH data obtained from He I 10830 Å maps at National Solar Observatory-Kitt Peak
Ji-Hye Lee +3 more
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The Astrophysical Journal, 1975 It has been noted that coronal holes appear to be associated with regions of diverging magnetic field in the corona. We set out to test the hypothesis that coronal holes may be caused by an increased flow of energy into the solar wind resulting directly from this diverging magnetic field pattern.
W. M. Adams, P. A. Sturrock
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