Results 161 to 170 of about 600 (183)

Coronal Holes in Solar Cycles 21 to 23

Solar Physics, 2013
We present identifications of coronal holes (CHs) from observations in the He i 10 830 A line made at Kitt Peak Observatory (from 1975 to 2003) and in the EUV 195 A wavelength with SOHO/EIT (from 1996 to 2012). To determine whether a feature is a CH we have developed semi-automatic techniques for delineating CH borders on synoptic charts and for ...
A. Tlatov, K. Tavastsherna, V. Vasil’eva   +2 more
openaire   +1 more source

Coronal Holes and Solar Mass Loss

1981
During the declining phase of solar activity, and possibly at other phases, solar mass loss occurs in the form of high speed streams in the solar wind. These streams originate in low density, low temperature coronal regions, called “holes.” The physical properties of the wind streams and the holes will be discussed.
openaire   +1 more source

Solar cycle dependence of polar coronal holes

Solar Physics, 1993
A study has been made of the polar coronal holes in relation to solar cycle activity. Important results obtained are: (i) the peak of the frequency distribution of coronal hole size shifts towards lower values as the solar cycle advances towards maximum, this being true for both the north and south polar holes, (ii) coronal hole size decreases with the
T. K. Das, T. N. Chatterjee, A. K. Sen
openaire   +1 more source

Coronal mass ejections: Relationship with solar flares and coronal holes

2002
Abstract The Coronal Mass Ejections (CMEs) observed by the LASCO coronagraph and associated solar activity phenomena whose locations were identified by EIT and solar Hα flare observations during year 2000 indicate that about 40%, 26% and 30% of CMEs were observed when there were coronal holes (CHs) within 1–10, 11–20 and 21–40 degrees, respectively
openaire   +1 more source

Coronal Holes and the High-Speed Solar Wind

Space Science Reviews, 2002
Coronal holes are the lowest density plasma components of the Sun's outer atmosphere, and are associated with rapidly expanding magnetic fields and the acceleration of the high-speed solar wind. Spectroscopic and polarimetric observations of the extended corona, coupled with interplanetary particle and radio sounding measurements going back several ...
openaire   +1 more source

CORONAL HOLES AND THE SOLAR WIND

2018
R. ESSER, S. R. HABBAL
openaire   +1 more source

Population of Bright Plume Threads in Solar Polar Coronal Holes

Solar Physics, 2021
Lidong Xia, Zhenghua Huang, Hui Fu
exaly  

The Evolution of Coronal Holes over Three Solar Cycles Using the McIntosh Archive

Solar Physics, 2020
Ian Hewins, Sarah Gibson, S W Mcintosh
exaly  

Rotating solar coronal holes and periodic modulation of the upper atmosphere

Geophysical Research Letters, 2008
J P Thayer, Jiuhou Lei, Eric Sutton
exaly  

Evolution of Coronal Holes and Implications for High-Speed Solar Wind During the Minimum Between Cycles 23 and 24

Solar Physics, 2010
G De Toma
exaly