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Systematic effects on LBA phases

Submitter: Francesco de Gasperin - Maaijke Mevius
Description: Observing at <100 MHz with LOFAR is still challenging, but our understanding of the instrument systematic effects is getting more and more complete.

From top-left to bottom-right:
  • Clock delay (in s)
  • TEC (in TECU)
  • RM (in radians)
  • third order ionospheric effect (in arbitrary unit)

    Each line is a station, blue to red from core to remote. All plots show differential values w.r.t. CS001.

    The sum of these effects (clock+ionospheric 1st, 2nd and 3rd order) seems to describe all the phase systematic errors present in LBA data when solving in the direction of a strong calibrator. Correlation between nearby stations and between different ionospheric orders is expected and observed.
  • Copyright: Francesco de Gasperin - Maaijke Mevius
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