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- W3201766573 abstract "Interferometric observations of the Sun with ALMA provide valuable diagnostic tools for studying the small-scale dynamics of the solar atmosphere. Estimations of the observability of the small-scale dynamics as a function of spatial resolution for regions with different characteristic magnetic field topology facilitate a more robust analysis of ALMA observations of the Sun. A 3D model of the solar atmosphere from the MHD code Bifrost was used to produce high-cadence observables at mm and submm wavelengths. The synthetic observables for receiver bands 3-10 were degraded to the angular resolution corresponding to ALMA observations with different configurations of the interferometric array from the most compact C1, to the more extended C7. The observability of the small-scale dynamics was analyzed in each case. The analysis was thus also performed for predicting the potential of future capabilities. The minimum resolution required to study the typical small spatial scales in the solar chromosphere depends on the characteristic properties of the target region. Here, a range from quiet Sun to enhanced network loops is considered. Limited spatial resolution affects the observable signatures of dynamic small-scale brightening events in the form of reduced brightness temperature amplitudes, potentially leaving them undetectable, and even shifts in the times at which the peaks occur of up to tens of seconds. Conversion factors between the observable brightness amplitude and the original amplitude in the fully resolved simulation are provided that can be applied to observational data in principle, but are subject to wavelength-dependent uncertainties. Predictions of the typical appearance at the different combinations of receiver band, array configuration, and properties of the target region are conducted." @default.
- W3201766573 created "2021-10-11" @default.
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- W3201766573 date "2021-09-28" @default.
- W3201766573 modified "2023-10-18" @default.
- W3201766573 title "The Sun at millimeter wavelengths. III. Impact of the spatial resolution on solar ALMA observations" @default.
- W3201766573 hasPublicationYear "2021" @default.
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