Results 71 to 80 of about 1,446 (180)
Are subsurface flows and coronal holes related?
, 2012 International audienceWe study synoptic maps of solar subsurface flows covering six Carrington rotations (2050 to 2055). The subsurface flows are determined with a ring-diagram analysis of GONG high-resolution Doppler data.
Harra, Louise K. +5 more
core +1 more source
The variation of coronal holes with solar cycle
, 2007 Coronal holes are commonly known to be the source of the open magnetic flux and the high-speed solar wind. In EUV and X-ray emission lines, coronal holes are seen as the regions with reduced emission due to lower temperatures and electron density than ...
Chapman, Steven Antony
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Multi-Thermal Segmentation of Solar Coronal Holes
, 2016 Here we present a poster describing a new multi-thermal segmentation method, to extract coronal boundaries from that of the quiet Sun.Our method uses 3 wavebands (171A, 193A and 211A) to exctract coronal holes and their ...
Peter Gallagher (99110) +1 more
core +1 more source
Out-of-ecliptic studies of coronal holes and their relation to the solar wind
, 1976 The advantages of observing coronal holes of the sun above the solar ecliptic plane by a solar probe are discussed. Also discussed are the size of coronal holes, their temperature, and magnetic fields associated with the holes.
Noyes, R. W.
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CORONAL HOLES AND THE HIGH-SPEED SOLAR WIND
, 2008 . 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.
Steven R. Cranmer
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Signatures of Nonlinear Waves in Coronal Plumes and Holes
, 1999 In recent Ultraviolet Coronagraph Spectrometer/Solar and Heliospheric Observatory (UVCS/SOHO) White Light Channel (WLC) observations we found quasi-periodic variations in the polarized brightness (pB) in the polar coronal holes at heliocentric distances ...
Ofman, Leon
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Radial evolution of cross helicity in high-latitude solar wind
, 2005 We employ a turbulence transport theory to explain the high-latitude radial evolution of cross helicity, or Alfvénicity, observed by the Ulysses spacecraft.
Matthaeus, William H. +6 more
core +1 more source
Cosmic ray response to CMEs related with solar flares and coronal holes
, 1993 413-414The results of an analysis of the associations of coronal mass ejections (CMEs) with solar flares and coronal holes are presented. The above associations are examined by assuming that the cosmic ray response to the CMEs related with solar flares ...
Yadav, R S, Sharma, N K, Agrawal, S P
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Automatic Segmentation of Coronal Holes in Solar Images and Solar Prediction Map Classification
, 2016 Solar image analysis relies on the detection of coronal holes for predicting disruptions to earth’s magnetic field. The coronal holes act as sources of solar wind that can reach the earth.
Jatla, Venkatesh
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The Geometric Spreading of Coronal Plumes and Coronal Holes
, 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
Wu, S. T. +4 more
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