Aug 28 – 30, 2024
BC Building, Swiss Federal Institute of Technology Lausanne (EPFL)
Europe/Zurich timezone

Ionospheric plasma bubbles in the MWA data and updates from Japan

Aug 29, 2024, 9:50 AM
20m
BC01 (level 0) (BC Building, Swiss Federal Institute of Technology Lausanne (EPFL))

BC01 (level 0)

BC Building, Swiss Federal Institute of Technology Lausanne (EPFL)

Rte Cantonale, 1015 Lausanne, Switzerland
Presentation Solar, Heliospheric and Ionospheric Science (SHI) Solar, Heliospheric and Ionospheric Science

Speaker

Shintaro Yoshiura (NAOJ)

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.

Primary author

Presentation materials