Results 21 to 30 of about 38,972 (307)

Observational signatures of waves and flows in the solar corona [PDF]

, 2015
DM acknowledges support of a Royal Society University Research Fellowship and a KU Leuven Research Council senior research fellowship (SF/12/008). The research leading to these results has also received funding from the European Commission Seventh ...
Antolin, Patrick, Van Doorsselaere, T., De Moortel, I., Van Doorsselaere, Tom   +3 more
core   +1 more source

Physics of outflows near solar active regions [PDF]

Annales Geophysicae, 2015
Hinode/EIS observations have revealed outflows near active regions which remain unexplained. An outflow region observed by the EUV Imaging Spectrometer (EIS) that appears slightly redshifted at low temperatures and blueshifted at higher temperatures ...
D. J. Price, Y. Taroyan
doaj   +1 more source

Solar wind dependence of ion parameters in the earth's magnetospheric region calculated from CLUSTER observations [PDF]

, 2008
Moments calculated from the ion distributions (~0–40 keV) measured by the Cluster Ion Spectrometry (CIS) instrument are combined with data from the Cluster Flux Gate Magnetometer (FGM) instrument and used to characterise the bulk properties of the plasma
M. G. G. T. Taylor, Denton, M. H., Taylor, M. G. G. T., M. H. Denton   +3 more
core   +1 more source

SOLAR TRANSITION REGION IN THE QUIET SUN AND ACTIVE REGIONS

, 2010
The solar transition region (TR), in which above the photosphere the tempera- ture increases rapidly and the density drops dramatically, is believed to play an important role in coronal heating and solar wind acceleration. Long-lasting up-flows are present in the upper TR and interpreted as signatures of mass supply to large coronal loops in the quiet ...
Tian, H., Curdt, W., He, J. -S.
openaire   +2 more sources

Magnetohydrodynamic Seismology of Quiet Solar Active Regions [PDF]

The Astrophysical Journal Letters, 2019
Abstract The ubiquity of recently discovered low-amplitude decayless kink oscillations of plasma loops allows for the seismological probing of the corona on a regular basis. In particular, in contrast to traditionally applied seismology that is based on the large-amplitude decaying kink oscillations excited by flares and eruptions ...
Sergey A. Anfinogentov, V. M. Nakariakov
openaire   +3 more sources

Diagnostics of active and eruptive prominences through hydrogen and helium lines modelling [PDF]

, 2008
In this study we show how hydrogen and helium lines modelling can be used to make a diagnostic of active and eruptive prominences. One motivation for this work is to identify the physical conditions during prominence activation and eruption. Hydrogen and
N. Labrosse, Labrosse, N., Vial, J.-C., P. Gouttebroze, Gouttebroze, P., J.-C. Vial   +5 more
core   +1 more source

Differences in the solar cycle variability of simple and complex active regions during 1996-2018 [PDF]

, 2019
Aims. Our aim is to examine the solar cycle variability of magnetically simple and complex active region. Methods. We studied simple (alpha and beta) and complex (beta gamma and beta gamma delta) active regions based on the Mount Wilson magnetic ...
M. J. Käpylä, E. I. Tanskanen, Nikbakhsh, Shabnam, T. Hackman, Tanskanen, E., Nikbakhsh, S., Hackman, T., Käpylä, Maarit, S. Nikbakhsh, Tanskanen, Eija, Tanskanen, E. I., Käpylä, M., Käpylä, M. J.   +12 more
core   +1 more source

Magnetic Reconnection between a Solar Jet and a Filament Channel

The Astrophysical Journal
The solar corona is highly structured by bunches of magnetic field lines forming either loops, or twisted flux ropes representing prominences/filaments, or very dynamic structures such as jets.
Garima Karki, Brigitte Schmieder, Pooja Devi, Ramesh Chandra, Nicolas Labrosse, Reetika Joshi, Bernard Gelly   +6 more
doaj   +1 more source

Properties of EUV and X-ray emission in solar active regions

, 2001
Using observations from the Coronal Diagnostic Spectrometer (CDS) on SoHO and the Soft. X-ray Telescope (SXT) on Yohkoh we investigate how the spatial properties of active region emission observed in the EUV and X-ray range varies with temperature.
Harra, LK, L. K. Harra, J. A. Klimchuk, Matthews, SA, S. A. Matthews, Klimchuk, JA   +5 more
core   +1 more source

Helicity proxies from linear polarisation of solar active regions

, 2020
Context. The α effect is believed to play a key role in the generation of the solar magnetic field. A fundamental test for its significance in the solar dynamo is to look for magnetic helicity of opposite signs both between the two hemispheres as well as
M. J. Käpylä, Brandenburg, A., A. Lagg, Brandenburg, Axel,, Kaepylae, M. J., Käpylä, M., A. Prabhu, A. Brandenburg, Käpylä, Maarit J.,, Lagg, A., Prabhu, A.   +10 more
core   +1 more source