21cmEMUv3 emulates the cylindrical 21cm power spectrum via score-based diffusion and six other 21cmFAST observables via LSTM networks at sub-percent accuracy, then uses the emulator to infer a lower limit on soft-band X-ray luminosity from HERA data.
Characterisation of the ionosphere above the Murchison Radio Observatory using the Murchison Widefield Array
5 Pith papers cite this work. Polarity classification is still indexing.
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Pith papers citing it
abstract
We detail new techniques for analysing ionospheric activity, using Epoch of Reionisation (EoR) datasets obtained with the Murchison Widefield Array (MWA), calibrated by the `Real-Time System' (RTS). Using the high spatial- and temporal-resolution information of the ionosphere provided by the RTS calibration solutions over 19 nights of observing, we find four distinct types of ionospheric activity, and have developed a metric to provide an `at a glance' value for data quality under differing ionospheric conditions. For each ionospheric type, we analyse variations of this metric as we reduce the number of pierce points, revealing that a modest number of pierce points is required to identify the intensity of ionospheric activity; it is possible to calibrate in real-time, providing continuous information of the phase screen. We also analyse temporal correlations, determine diffractive scales, examine the relative fractions of time occupied by various types of ionospheric activity, and detail a method to reconstruct the total electron content responsible for the ionospheric data we observe. These techniques have been developed to be instrument agnostic, useful for application on LOFAR and SKA-Low.
verdicts
UNVERDICTED 5representative citing papers
uGMRT Band-4 data on 3C48 show ionospheric phase structure functions with power-law turbulence, diffractive scales of 6.7-8.3 km, and anisotropy consistent with MSTIDs at ~19°N latitude.
A multi-telescope comparative study of ionospheric phase fluctuations, TEC gradients, and scintillation is used to assess impacts on calibration and forecast effects for SKA-Low and SKA-Mid.
MWA Phase III upgrade adds receivers and uses MWAX correlator to support full 256-tile correlation, doubling sensitivity and quadrupling baselines.
Summarizes observational lessons on simulation pipelines and systematic mitigation from SKAO precursors for Cosmic Dawn and EoR studies.
citing papers explorer
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21cmEMUv3: a hybrid diffusion-LSTM emulator of 21cmFAST summary observables
21cmEMUv3 emulates the cylindrical 21cm power spectrum via score-based diffusion and six other 21cmFAST observables via LSTM networks at sub-percent accuracy, then uses the emulator to infer a lower limit on soft-band X-ray luminosity from HERA data.
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Studying Ionospheric Phase Structure Functions Using Wide-Band uGMRT (Band-4) Interferometric Data
uGMRT Band-4 data on 3C48 show ionospheric phase structure functions with power-law turbulence, diffractive scales of 6.7-8.3 km, and anisotropy consistent with MSTIDs at ~19°N latitude.
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Studying Ionosphere Using SKA-Low and SKA-Mid
A multi-telescope comparative study of ionospheric phase fluctuations, TEC gradients, and scintillation is used to assess impacts on calibration and forecast effects for SKA-Low and SKA-Mid.
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The Murchison Widefield Array Phase III upgrade: Sensitivity Doubled, Number of Baselines Quadrupled, Flexibility Enhanced, and EoR Observations Optimised
MWA Phase III upgrade adds receivers and uses MWAX correlator to support full 256-tile correlation, doubling sensitivity and quadrupling baselines.
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Observations of the Cosmic Dawn and Epoch of Reionization with the SKAO: Observational Lessons Learned from Precursors and Pathfinder Instruments
Summarizes observational lessons on simulation pipelines and systematic mitigation from SKAO precursors for Cosmic Dawn and EoR studies.