Wolfgang

Polarized radio emission arises from ordered magnetic fields,
where a variety of morphologies are observed. These are related
to SNR evolution, a central object and/or an interaction with the
ambient medium. The interpretation of SNR polarization data may
depend on calibration issues and Faraday effects. Magnetic
field strength estimates from radio data by equipartition
or compression arguments, are mostly lower compared to estimates from high-energy data. Current SNR-catalogues are incomplete in particular for faint large objects. Follow-up work of recent Galactic plane surveys has revealed more objects with low
surface-brightness and high polarization percentage. Their
identification is difficult and progress is slow.