Results 21 to 30 of about 941 (201)

Small scale energy release driven by supergranular flows on the quiet Sun [PDF]

, 2007
In this article we present data and modelling for the quiet Sun that strongly suggest a ubiquitous small-scale atmospheric heating mechanism that is driven solely by converging supergranular flows. A possible energy source for such events is the power
Diver, D., Potts, H.E., Khan, J.
core   +1 more source

Micro-events in the active and quiet solar corona [PDF]

Advances in Space Research, 2003
The content of hot material in the corona is not constant. Soft X-ray and high-temperature EUV line observations show that new material, apparently heated and evaporated from the chromosphere, is frequently injected into the corona both in active and quiet regions. Active regions are found to exhibit transient brightenings, termed here microflares, due
Benz, Arnold O., Grigis, Paolo C.
openaire   +2 more sources

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

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, Hnat, B., Kiyani, K., S. C. Chapman, K. Kiyani, Chapman, S. C., Chapman, Sandra C.   +6 more
core   +1 more source

Study of Radio Transients from the Quiet Sun during an Extremely Quiet Time

The Astrophysical Journal, 2023
In this work, we study a class of recently discovered meter-wave solar transients referred to as Weak Impulsive Narrowband Quiet Sun Emission (WINQSEs).
Surajit Mondal, Divya Oberoi, Ayan Biswas   +2 more
doaj   +1 more source

Multi-scale statistical analysis of coronal solar activity [PDF]

Nonlinear Processes in Geophysics, 2016
Multi-filter images from the solar corona are used to obtain temperature maps that are analyzed using techniques based on proper orthogonal decomposition (POD) in order to extract dynamical and structural information at various scales.
D. Gamborino, D. del-Castillo-Negrete, J. J. Martinell   +2 more
doaj   +1 more source

High-frequency Decayless Waves with Significant Energy in Solar Orbiter/EUI Observations

The Astrophysical Journal, 2023
High-frequency wave phenomena present a great deal of interest as one of the possible candidates to contribute to the energy input required to heat the corona as a part of the alternating current heating theory.
Elena Petrova, Norbert Magyar, Tom Van Doorsselaere, David Berghmans   +3 more
doaj   +1 more source

Photospheric magnetic vortex structures [PDF]

, 2011
Using direct numerical magneto-hydrodynamic (MHD) simulations, we demonstrate the evidence of two physically different types of vortex motions in the solar photosphere.
Shelyag, S., Keenan, Francis, F. P. Keenan, Fedun, V., Mathioudakis, Mihalis, Mathioudakis, M., M. Mathioudakis, Shelyag, Sergiy, Erdélyi, Robert, Keenan, F. P., Erdelyi, R., R. Erdélyi, S. Shelyag, V. Fedun, Fedun, Viktor   +14 more
core   +1 more source

LOFAR imaging of the solar corona during the 2015 March 20 solar eclipse [PDF]

, 2021
The solar corona is a highly-structured plasma which can reach temperatures of more than ∼2 MK. At low frequencies (decimetric and metric wavelengths), scattering and refraction of electromagnetic waves are thought to considerably increase the imaged ...
Fallows, R, H. Reid, Ryan, A.M., M. A. Brentjens, F. Breitling, P. Zucca, Halfwerk, R., Gallagher, PT, Morosan, D. E., Murphy, P. C., Murphy, P.C., Gallagher, P.T., R. Fallows, Brentjens, MA, Carley, E. P., Zucca, P, C. Vocks, Morosan, DE, Fallows, R., Brentjens, M. A., P. T. Gallagher, Magdalenic, J, Carley, EP, Reid, H., P. C. Murphy, Brentjens, M.A., (AIP), Leibniz Institut fur Astrophysik, Morosan, D.E., E. P. Carley, Kerdraon, A., A. M. Ryan, Magdalenic, J., Zucca, P., D. E. Morosan, Ryan, A. M., Breitling, F., Kerdraon, A, Halfwerk, R, Mann, G, Gallagher, P. T., Carley, E.P., Mann, G., Reid, H, R. Halfwerk, J. Magdalenic, G. Mann, Murphy, PC, Gallagher, Peter T., Ryan, AM, A. Kerdraon, Vocks, C., Vocks, C, Breitling, F   +52 more
core   +1 more source

Correlation analysis of solar flux absolute measurements at 161 and 245 MHz

Solar-Terrestrial Physics, 2023
Solar emission in meter waves originates from upper layers of the solar corona. We present absolute measurements of solar flux from Irkutsk Incoherent Scatter Radar (161 MHz frequency) and Learmonth Observatory (245 MHz frequency). We perform correlation
Setov A. G., Kushnarev D. S.
doaj   +1 more source