Speaker
Description
The plasma bubble where the density of the ionosphere is low caused due to the Rayleigh–Taylor instability. As the low-density region contains a small-scale structure, the variation of total electron content (TEC) is a good indicator of a plasma bubble. The TEC data observed by the Global Navigation Satellite Systems (GNSS) shows plasma bubbles propagated to Western Australia from the equatorial region on 1st Dec 2023. The MWA coincidentally was in operation for the Epoch of Reionization science. I report the ionospheric activity found in the EoR data. The data shows that duct-like structures go through the MWA primary beam with a velocity of 100 m/s and significantly smear extragalactic radio sources. In the duct-lie structure, a source is split into multiple components and the apparent offset is larger than 1 degree.
I also report research updates from Japan such as the GPR foreground removal for detecting the 21cm signal from the Epoch of Reionization, Winsorized RFI flagging using calibrated gain amplitude, non-Gaussian-based RFI findings and drift-scan ultralow data analysis.
