The Astrophysical Journal, 2023 We investigate the origin of mesoscale structures in the solar wind called microstreams, defined as enhancements in the solar wind speed and temperature that last several hours.
Bahaeddine Gannouni +2 more
doaj +1 more source
The Sun's global photospheric and coronal magnetic fields : observations and models [PDF]
, 2012 2012LRSP....9....6M Funding: STFC, the Leverhulme Trust and European Commission’s Seventh Framework Programme (FP7/2007-2013) under the grant agreement SWIFF (project no.
Anthony Yeates +5 more
core +1 more source
Long term changes in EUV and X-ray emissions from the solar corona and chromosphere as measured by the response of the Earth’s ionosphere during total solar eclipses from 1932 to 1999 [PDF]
Annales Geophysicae, 2001 Measurements of the ionospheric E region during total solar eclipses in the period 1932–1999 have been used to investigate the fraction of Extreme Ultra Violet and soft X-ray radiation, 8, that is emitted from the limb corona and chromosphere.
C. J. Davis +5 more
doaj +1 more source
Turbulence in the solar corona
AIP Conference Proceedings, 2007 The solar corona has been revealed in the past decade to be a highly dynamic nonequilibrium plasma environment. Both the loop-filled coronal base and the extended acceleration region of the solar wind appear to be strongly turbulent, but direct observational evidence for a cascade of fluctuation energy from large to small scales is lacking.
openaire +2 more sources
ORFEES – a radio spectrograph for the study of solar radio bursts and space weather applications
Journal of Space Weather and Space Climate, 2021 Radio bursts are sensitive tracers of non-thermal electron populations in the solar corona. They are produced by electron beams and shock waves propagating through the corona and the heliosphere, and by trapped electron populations in coronal mass ...
Hamini Abdallah +10 more
doaj +1 more source
Spatial magneto-seismology : effect of density stratification on the first harmonic amplitude profile of transversal coronal loop oscillations [PDF]
, 2007 Context. The new generation of extreme-ultraviolet (EUV) imagers onboard missions such as the Solar Dynamics Observatory (SDO)and Solar Orbiter (SO) will provide the most accurate spatial measurements of post-flare coronal loop oscillations yet.
Erdélyi, R. (Robertus) +7 more
core +1 more source
Co-existence of two plasma phases in solar and AGN coronas [PDF]
Serbian Astronomical Journal, 1998 Here we have juxtaposed two distant cosmic locations of the Sun and AGN where neutral hydrogen appears in a close connection with hot coronas. Besides the solar photosphere, chromosphere and prominences where the presence of neutral hydrogen is ...
Kubičela A. +4 more
doaj +1 more source
A new approach to the maser emission in the solar corona
, 2015 Aims. The electron plasma frequency ωpe and electron gyrofrequency Ωe are two parameters that allow us to describe the properties of a plasma and to constrain the physical phenomena at play, for instance, whether a maser instability develops.
Regnier, Stephane, S. Régnier
core +1 more source
POLAR investigation of the Sun—POLARIS [PDF]
, 2008 The POLAR Investigation of the Sun (POLARIS) mission uses a combination of a gravity assist and solar sail propulsion to place a spacecraft in a 0.48 AU circular orbit around the Sun with an inclination of 75° with respect to solar equator.
Appourchaux, Thierry +74 more
core +1 more source
Solar cycle dependence of scaling in solar wind fluctuations [PDF]
, 2008 In this review we collate recent results for the statistical scaling properties of fluctuations in the solar wind with a view to synthesizing two descriptions: that of evolving MHD turbulence and that of a scaling signature of coronal origin that ...
B. Hnat +6 more
core +1 more source