Faraday rotation measurements are used to constrain simple models representing possible extremes of the structure of extra-galactic magnetic fields (EGMFs). Relevant fields are found quite generally to be at the μG level rather than the nG level usually assumed. Even the highest energy cosmic ray protons should experience large deflections over distances of order 1 Mpc. Such large deflections a...

We present the first 6.7 GHz methanol maser linear polarization map of the extended filamentary maser structure around the compact H region W3(OH). The methanol masers show linear polarization up to ∼ 8 per cent and the polarization angles indicate a magnetic field direction along the North-South maser structure. The polarization angles are consistent with those measured for the OH masers, ta...

We present new submillimeter polarimetric observations of the Galactic center region, made using the SPARO polarimeter that operates at the South Pole. Compared with previous submillimeter polarimetry of this region, our measurements cover much more sky area, and they imply that the molecular gas in the central few hundred pc is threaded by a large scale toroidal magnetic field. We consider thi...

We study electromagnetic properties of periodic composite structures, such as photonic crystals, involving lossy components. We show that in many cases a properly designed periodic structure can dramatically suppress the losses associated with the absorptive component, while preserving or even enhancing its useful functionality. As an example, we consider magnetic photonic crystals, in which th...

Cheng Wang 1,*, Liang Chen 1, Haisheng Zhao 2, Zheng Lu 3, Mingming Bian 3, Running Zhang 3 and Jian Feng 2 1 Qian Xuesen Laboratory of Space Technology, China Academy of Space Technology, Beijing 100094, China; [email protected] 2 National Key Laboratory of Electromagnetic Environment, China Research Institute of Radiowave Propagation, Qingdao 266107, China; [email protected] (H.Z.); f...

We review observations of extended regions of radio emission in clusters; these include diffuse emission in 'relics', and the large central regions commonly referred to as 'halos'. The spectral observations, as well as Faraday rotation measurements of background and cluster radio sources, provide the main evidence for large-scale intracluster magnetic fields and significant densities of relativ...

This paper gives an overview of activities and results from the Swedish part of the international calibration and validation efforts for ALOS PALSAR. Four large trihedral corner reflectors were deployed and the measured co-polar responses showed that the PALSAR system performed well and was stable over time. The cross-talk level was found to be lower than – 34.5 dB. Two different methods for es...

The European Space Agency BIOMASS mission will use a P-band polarimetric SAR at 435MHz with 6MHz bandwidth to measure above-ground biomass in order to assess the levels of carbon tied up in forests across the globe. It will also be capable of measuring changes in this quantity over its 5-year lifetime. At this wavelength, the ionosphere can strongly affect the signal, the principal effects bein...

Radio observations of large-scale magnetic fields in spiral galaxies suggest that these fields show in many cases a dominating S0 symmetry, i.e. even symmetry to the central plane and axisymmetry with respect to the rotational axis. In addition, detailed evaluation of Faraday rotation measures in five nearby galaxies reveals that in four cases the magnetic field lines are directed toward the ce...

• Installation of a wideband " UWL " receiver covering the band 0.7 GHz to 4.0 GHz on the Parkes 64-m telescope, together with the 20cm Multibeam receiver, would allow more than 90% of current Parkes observations to be made with no receiver changes, greatly improving the efficiency of Parkes operations. • The digital receiver system could be configured for all types of pulsar observation (excep...