Results 131 to 140 of about 1,089,572 (146)
Morphology, Dynamics and Plasma Parameters of Plumes and Inter-Plume Regions in Solar Coronal Holes [PDF]
Astronomy and Astrophysics Review, 2011 To appear on: The Astronomy and Astrophysics Review.
William H. Matthaeus +2 more
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The Expansion of Coronal Plumes in the Fast Solar Wind
Space Science Reviews, 1998Coronal plumes are believed to be essentially magnetic features: they are rooted in magnetic flux concentrations at the photosphere and are observed to extend nearly radially above coronal holes out to at least 15 solar radii, probably tracing the open field lines.
Luca Del Zanna +2 more
exaly +3 more sources
Critical Magnetic Field Strengths for Solar Coronal Plumes in Quiet Regions and Coronal Holes? [PDF]
Astrophysical Journal, 2018 AbstractCoronal plumes are bright magnetic funnels found in quiet regions (QRs) and coronal holes (CHs). They extend high into the solar corona and last from hours to days. The heating processes of plumes involve dynamics of the magnetic field at their base, but the processes themselves remain mysterious.
Sanjiv K Tiwari +2 more
exaly +3 more sources
Coronal Plumes and Fine Scale Structure in High Speed Solar Wind Streams
Space Science Reviews, 1994We present a solar wind model which takes into account the possible origin of fast solar wind streams in coronal plumes. We treat coronal holes as being made up of essentially 2 plasma species, denser, warmer coronal plumes embedded in a surrounding less dense and cooler medium.
Marco Velli, S R Habbal, R Esser
exaly +2 more sources
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
S T Suess, A H Wang, G Poletto
exaly +1 more source
Accelerating and Supersonic Density Fluctuations in Coronal Hole Plumes: Signature of Nascent Solar Winds [PDF]
Astrophysical Journal Letters, 2020 Abstract Slow magnetoacoustic waves in a static background provide a seismological tool to probe the solar atmosphere in the analytic frame. By analyzing the spatiotemporal variation of the electron number density of plume structure in coronal holes above the limb for a given temperature, we find that the density perturbations accelerate
Yong-Jae Moon +2 more
exaly +4 more sources
Properties of Solar Polar Coronal Plumes Constrained by Ultraviolet Coronagraph Spectrometer Data [PDF]
Astrophysical Journal, 2007 11 ...
Sami Solanki +2 more
exaly +3 more sources
Time-Dependent Hydrodynamical Simulations of Slow Solar Wind, Coronal Inflows, and Polar Plumes [PDF]
Astronomy and Astrophysics, 2009 Aims. We explore the effects of varying the areal expansion rate and coronal heating function on the solar wind flow. Methods. We use a one-dimensional, time-dependent hydrodynamical code. The computational domain extends from near the photosphere, where nonreflecting boundary conditions are applied, to 30 , and includes a transition region where ...
Rui F. Pinto, Y -M Wang, J Lèorat
exaly +3 more sources
Solar Polar Plume Lifetime and Coronal Hole Expansion: Determination From Long-Term Observations
Astrophysical Journal, 2001 We have generated off-limb polar synoptic charts of polar plume evolution at various solar altitudes using EUV Imaging Telescope and Large Angle and Spectrometric Coronagraph data from 1996 December. The charts allow direct measurement of the altitude expansion of the solar minimum coronal holes.
C E Deforest, A Llebaría, P L Lamy
exaly +2 more sources
Space Science Reviews, 1999
Results from a series of SOHO/Coronal Diagnostic Spectrometer (CDS) observations of coronal holes and plumes are presented, including analysis of a low-latitude plume observed in August 1996. Spectroscopic diagnostic techniques using the CHIANTI atomic database are applied to derive the plasma parameters: electron density, temperature, and element ...
Giulio Del Zanna, B J I Bromage
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Results from a series of SOHO/Coronal Diagnostic Spectrometer (CDS) observations of coronal holes and plumes are presented, including analysis of a low-latitude plume observed in August 1996. Spectroscopic diagnostic techniques using the CHIANTI atomic database are applied to derive the plasma parameters: electron density, temperature, and element ...
Giulio Del Zanna, B J I Bromage
exaly +2 more sources