Results 51 to 60 of about 1,446 (180)
Comparative Study of Microwave Polar Brightening, Coronal Holes, and Solar Wind over the Solar Poles [PDF]
, 2019 We compared the long-term variation (1992–2017) in solar polar brightening observed with the Nobeyama Radioheliograph, the polar solar-wind velocity with interplanetary scintillation observations at the Institute for Space-Earth Environmental Research ...
Tokumaru, Munetoshi +5 more
core +1 more source
Dynamical age of solar wind turbulence in the outer heliosphere
, 1998 In an evolving turbulent medium, a natural timescale can be defined in terms of the energy decay time. The time evolution may be complicated by other effects such as energy supply due to driving, and spatial inhomogeneity.
Matthaeus, William H. +5 more
core +1 more source
, 2008 Coronal holes are regions of low-density plasma on the Sun that have magnetic fields that open freely into interplanetary space. During times of low solar activity, coronal holes cover the north and south polar caps of the Sun. During more active periods,
core +1 more source
Propagation and damping of MHD waves in the solar atmosphere
, 2015 Quasi-periodic disturbances have been observed in the outer solar atmosphere for many years. Although first interpreted as upflows (Schrijver et al.
Kiddie, Greg
core
Solar magnetic field reversal as seen at Ulysses
, 2003 The rapid motion of the Ulysses spacecraft from high southern to high northern latitudes in 2000–2001 provided an excellent opportunity to make inferences regarding the solar magnetic dipole's behaviour around solar maximum.
Smith, E.J., Balogh, A., Jones, G.H.
core
Solar coronal-hole plasma densities and temperatures [PDF]
Astronomy & Astrophysics, 2006 Polar plumes extending from the Sun into the solar corona have long been seen during eclipses, and can now be studied without this restriction with telescopes and spectrometers on board of spacecraft. Despite the large amount of observational data available on this prominent phenomenon, it is not clear whether plumes contribute substantially to the ...
openaire +2 more sources
, 2016 Recent IRIS observations have revealed a prevalence of intermittent small-scale jets with apparent speeds of 80 - 250 kms(-1), emanating from small-scale bright regions inside network boundaries of coronal holes.
DeLuca, Ed E. +6 more
core +1 more source
Discrete changes in solar coronal hole boundaries
The Astrophysical Journal, 1990 Sequences of Skylab X-ray images near central meridian passages of a large solar coronal hole are used here to examine hole boundary changes with a time resolution of 90 min. It is found that X-ray bright points play a key role in both the expansion and contraction of the coronal hole.
S. W. Kahler, D. Moses
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The propagation and damping of slow magnetoacoustic waves in the solar atmosphere
, 2012 The propagation and damping of slow magnetoacoustic waves in the solar atmosphere is investigated, with particular emphasis placed on waves with periodicities of five minutes. The basic model of a uniform temperature loop is extended by the addition of
Owen, Nicholas Robert
core
Solar polar coronal hole - A mathematical simulation
The Astrophysical Journal, 1977 The northern polar region of the sun was studied during July 1973 by Munro and Jackson through use of the white-light coronagraph and the X-ray photographs produced by the Skylab mission. They described the northern polar hole as nearly axisymmetric and gave the geometry and density distribution under this approximation.
S. T. Suess +3 more
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