Results 111 to 120 of about 14,687 (203)

Surface Alfven Wave Damping in a 3D Simulation of the Solar Wind

, 2009
Here we investigate the contribution of surface Alfven wave damping to the heating of the solar wind in minima conditions. These waves are present in regions of strong inhomogeneities in density or magnetic field (e.
Cohen, Cranmer, Cranmer, De Pontieu, Esser, Evans, Hasegawa, Heyvaerts, Jatenco-Pereira, Kohl, Lionello, M. Opher, Matthaeus, Matthaeus, Parker, Patsourakos, R. M. Evans, Roussev, Suzuki, T. I. Gombosi, Tomczyk, V. Jatenco-Pereira, Verdini   +22 more
core   +1 more source

Coronal and chromospheric physics [PDF]

Achievements and completed results are discussed for investigations covering solar activity during the solar maximum mission and the solar maximum year; other studies of solar activity and variability; infrared and submillimeter photometry; solar-related
Jefferies, J. T., Landman, D. A., Orrall, F. Q.   +2 more
core   +1 more source

Signatures for Solar Axions/WISPs

, 2010
Standard solar physics cannot account for the X-ray emission and other puzzles, the most striking example being the solar corona mystery. The corona temperature rise above the non-flaring magnetized sunspots, while the photosphere just underneath becomes
Anastassopoulos, Vassilis, Dafni, Theopisti, Papaevangelou, Thomas, Semertzidis, Yannis K, Tsagri, Mary, Vafeiadis, Theodoros, Zioutas, Konstantin   +6 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

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

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

Chromospheric evaporation as the driver of helium enrichment in active region solar wind: A case study

Astronomy & Astrophysics
Context. The physical mechanisms of helium abundance (AHe) depletion in the corona and solar wind are closely linked to coronal heating, solar wind origin, and acceleration processes. The relationships between the AHe in the solar wind and the properties
Ma Chi, Fu Hui, Madjarska Maria S., Shi Xinzheng, Huang Zhenghua, Xia Lidong   +5 more
doaj   +1 more source

Modeling Metric Gyrosynchrotron Radio Emission From the Quiet Solar Corona

The radio emission of the quiet Sun in the metric and decametric bands has not been well studied historically due to limitations of existing instruments. It is nominally dominated by thermal brehmsstrahlung of the solar corona, but may also include significant gyrosynchrotron emission, usually assumed to be weak under quiet conditions. In this work, we
Kozarev, Kamen, Nedal, Mohamed
openaire   +2 more sources

Metric and Decimetric Observations of the Quiet Solar Corona

, 1999
8th SOHO Workshop: Plasma Dynamics and Diagnostics in the Solar Transition Region and ...
Marque, C., Lantos, P., Delouis, J. M., Alissandrakis, C.   +3 more
openaire   +1 more source