Results 121 to 130 of about 14,709 (209)

Connecting the Low to High Corona: Propagating Disturbances as Tracers of the Near-Sun Solar Wind

The Astrophysical Journal
We revisit a quiet 14 day period of solar minimum during 2008 January and track substreamer propagating disturbances (PDs) from low heights in STEREO/EUVI to the extended corona through STEREO/COR1 and into STEREO/COR2 along nonradial paths that trace ...
Nathalia Alzate, Simone Di Matteo, Huw Morgan, Nicholeen Viall, Angelos Vourlidas   +4 more
doaj   +1 more source

The Temperature and Emission Measure Distribution in the Quiet and Active Solar Corona: A Bayesian Approach

The Astrophysical Journal, 2022
Abstract The reconstruction of the differential emission measure (DEM) from observations of spectral line intensities provides information on the temperature distribution of the emission measure in the region observed. The inversion process is known to be highly unstable, and it has been necessary to provide additional constraints, such ...
openaire   +2 more sources

Solar wind helium enhancements following major solar flares [PDF]

The observations of solar wind helium enhancements following major solar flares are reviewed, and the hypothesis that helium enhancements often mark flare piston plasma is confirmed.
Hirshberg, J.
core   +1 more source

Laboratory studies in ultraviolet solar physics [PDF]

The research activity comprised the measurement of basic atomic processes and parameters which relate directly to the interpretation of solar ultraviolet observations and to the development of comprehensive models of the component structures of the solar
Gardner, L. D., Kohl, J. L., Parkinson, W. H., Raymond, J. C., Smith, P. L.   +4 more
core   +1 more source

Velocity and Density Fluctuations in the Quiet Sun Corona

The Astrophysical Journal
We investigate the properties and relationship between Doppler velocity fluctuations and intensity fluctuations in the off-limb quiet Sun corona. These are expected to reflect the properties of Alfvénic and compressive waves, respectively.
Michael Hahn, Xiangrong Fu, Stefan J. Hofmeister, Yifan Huang, Alexandros Koukras, Daniel Wolf Savin   +5 more
doaj   +1 more source

The Role of Partial Ionization Effects in the Chromosphere

, 2015
The energy for the coronal heating must be provided from the convection zone. The amount and the method by which this energy is transferred into the corona depends on the properties of the lower atmosphere and the corona itself.
Carlsson, Mats, De Pontieu, Bart, Hansteen, Viggo H., Martinez-Sykora, Juan   +3 more
core   +1 more source

Correlated Quasiperiodic Pulsations in Type III Radio Bursts and Solar EUV Emission, Jetlets and Magnetic Fields: Comparisons of Intervals with and without Type III Storms

The Astrophysical Journal
Solar p -modes are ∼5 minute acoustic waves, which can be used as helioseismological diagnostics of the Sun’s subsurface. Recent studies relate them to quasiperiodic pulsations (QPPs) identified in X-rays, radio waves, and extreme ultraviolet (EUV ...
C. Cattell, L. Glesener, E. L. M. Hanson, Y. Kim, T. Mahaffey, R. B. Masek, M. Phillips, J. C. Buitrago-Casas, J. Martínez Oliveros, M. Pulupa, T. Ervin, S. Badman   +11 more
doaj   +1 more source

Quantifying Spicules

, 2012
Understanding the dynamic solar chromosphere is fundamental in solar physics. Spicules are an important feature of the chromosphere, connecting the photosphere to the corona, potentially mediating the transfer of energy and mass.
Anan, Bart De Pontieu, Beckers, Carlsson, De Pontieu, De Pontieu, De Pontieu, Hansteen, Heggland, Heggland, Judge, Langangen, Liu, Martínez-Sykora, Martínez-Sykora, Mats Carlsson, Matsumoto, McIntosh, Moore, Pereira, Rouppe van der Voort, Rouppe van der Voort, Sekse, Suematsu, Tiago M. D. Pereira, Tsiropoula, Zhang   +26 more
core   +1 more source

Magnetic Untwisting in Most Solar X-Ray Jets [PDF]

If TypeII spicules are made like Xray jets by granulesize emerging bipoles, then they plausibly power the quiet corona and solar ...
Cirtain, Jonathan, Falconer, David, Moore, Ron, Robe, Dominic, Sterling, Alphonse   +4 more
core   +1 more source

The Effect of Hydrostatic Weighting on the Vertical Temperature Structure of the Solar Corona

, 2000
We investigate the effect of hydrostatic scale heights ${\lambda}(T)$ in coronal loops on the determination of the vertical temperature structure $T(h)$ of the solar corona.
Markus J. Aschwanden, Nariaki Nitta, Priest E. R.   +2 more
core   +2 more sources