Results 41 to 50 of about 14,709 (209)
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 +3 more
doaj +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
, 2009 Measurements of the temperature and density structure of the solar corona provide critical constraints on theories of coronal heating. Unfortunately, the complexity of the solar atmosphere, observational uncertainties, and the limitations of current ...
Allen +26 more
core +1 more source
Soft X-ray coronal spectra at low activity levels observed by RESIK [PDF]
, 2010 The quiet-Sun X-ray emission is important for deducing coronal heating mechanisms, but it has not been studied in detail since the Orbiting Solar Observatory (OSO) spacecraft era.
B. Sylwester +27 more
core +1 more source
Time-dependent Dynamics of the Corona
The Astrophysical Journal Letters, 2023 We present in this Letter the first global comparison between traditional line-tied steady-state magnetohydrodynamic models and a new, fully time-dependent thermodynamic magnetohydrodynamic simulation of the global corona. To approximate surface magnetic
Emily I. Mason +5 more
doaj +1 more source
Role of Small-scale Impulsive Events in Heating the X-Ray Bright Points of the Quiet Sun
The Astrophysical Journal, 2023 Small-scale impulsive events, known as nanoflares, are thought to be one of the prime candidates that can keep the solar corona hot at its multimillion-Kelvin temperature.
Biswajit Mondal +8 more
doaj +1 more source
Coronal global EIT waves as tools for multiple diagnostics [PDF]
, 2007 Observations in EUV lines of the solar corona revealed large scale propagating waves generated by eruptive events able to travel across the solar disk for large distances. In the low corona, CMEs are known to generate, e.g. EIT waves which can be used to
I. Ballai, M. Douglas, Nowak
core +1 more source
Beyond small-scale transients: A closer look at the diffuse quiet solar corona
Astronomy & Astrophysics, 2023 Aims. Within the quiet Sun corona imaged at 1 MK, much of the field of view consists of diffuse emission that appears to lack the spatial structuring that is so evident in coronal loops or bright points. Our aim is to determine if these diffuse regions are categorically different in terms of their intensity fluctuations and spatial configuration from ...
Gorman, J. +11 more
openaire +3 more sources
Multimodal Differential Emission Measure in the Solar Corona [PDF]
, 2015 The Atmospheric Imaging Assembly (AIA) telescope on board the Solar Dynamics Observatory (SDO) provides coronal EUV imaging over a broader temperature sensitivity range than the previous generations of instruments (EUVI, EIT, and TRACE).
Frazin, Richard +3 more
core +2 more sources
The Astrophysical Journal, 2023 The Miniature X-ray Solar Spectrometer (MinXSS-1) CubeSat observed solar X-rays between 0.5 and 10 keV. A two-temperature, two-emission-measure model is fit to each daily averaged spectrum.
Bennet D. Schwab +2 more
doaj +1 more source