Speaker
Description
While MWA calibration solutions can usually be applied successfully to nighttime observations over several hours, the same is not true for daytime observations. This is particularly problematic for observations of the Sun, since the Sun's emission can change rapidly with frequency and time, meaning that there is no sky model to calibrate against.
Through the use of a large archive of daytime IPS observations that have been successfully calibrated, we show that the behaviour with frequency rules out an ionospheric effect, and that the change in phase with time is instead consistent with thermal expansion of the cables from beamformer to receiver.
We use this information to compensate for thermal expansion, meaning that solar observations can now be calibrated using standard calibration solutions. We explain this new calibration scheme, and provide some suggestions for future work.
| Timeslot preferences | I will be remote from Perth, so preferably early on in the day local time |
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