INSTITUTET FÖR RYMDFYSIK UPPSALA
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Swedish Institute of Space Physics (59o50.272'N, 17o38.786'E)

IRF Research Programme
PHISP - PHYSICS IN SPACE

LATEST NEWS

2015-06-22 Our paper Tripling the capacity of a point-to-point radio link by using electromagnetic vortices is published in Radio Science. The experiments reported in this paper show, for the first time, that it is possible to transmit, on a single free-space link, at least three independent physical radio channels on one and the same frequency.
2014-02-05 An article of ours, Electromagnetically Induced Torque on a Large Ring in the Microwave Range, is published in Physical Review Letters. Our experiment is a radio version of the celebrated Einstein-de Haas experiment Our experiment is the first that shows that the spin and orbital angular momentum carried by the electromagnetic field exerts a mechanical torque on a macroscopical body.
2013-11-13 On 24th of September, the International Telecommunication Union (ITU) visited our experimental site in Padua, Italy, to witness an experiment on Radio Orbital Angular Momentum (OAM) with potential for drastic improvement in spectral efficiency. In the experiment, we managed to triple the spectral capacity of a given radio link by using nothing but the inherent quantum property of electromagnetic angular momentum. By utilising also the so called MIMO technique, the capacity can be further increased in the same way and by (at least) the same amount as for today's linear momentum radio communications.
2012-03-01 Our paper Encoding many channels on the same frequency through radio vorticity: first experimental test appears in New Journal of Physics. The paper presents the results from our experiments in Padova and Venice, Italy, demonstrating for the first time in outdoor real-world radio experiments that Orbital Angular Momentum can be used as a means of transmitting more than one wireless channel on one and the same frequency and separating the channels at the receiving end.

The activities within the IRF Research Programme 'Physics in Space' (PHISP) focus on the study of the basic small- and large-scale processes and fundamental physical principles which control the Earth's interaction with its space environment. Of particular interest are linear and non-linear dynamical processes involving waves, radiation, turbulence, solitons, cavitons, alfveons, hybrons, striations and other structures in space plasma and the associated exchange of energy, linear momentum, and angular momentum between plasma and radiation.

Adopting a holistic point of view, where space is seen both as a natural laboratory without walls and as an object of study in itself, we try to enhance and widen the basis of our knowledge of the world around us. Systematic observations of space are compared with results obtained from theoretical research and numerical simulations carried out on clusters of supercomputers. In the experiments we use a combination of world-wide ground-based research infrastructures and instrumentation onboard satellites and other spacecraft.

Our work also includes the development of new instrumentation and experiment methodology based on modern fundamental physics. We have a long experience in designing and building very advanced instruments. Already in 1983 we built our first generation software defined radio (SDR) system for new types of radio studies of space. We are now (2010) into our eighth generation, with a fully vector sensing digtal sensor system that allows a complete characterisation and control of all parameters in an electromagnetic radio beam, including its energy, momentum, polarisation and angular momentum.

Additionally, we are involved in teaching and supervision of undergraduate and graduate students, and public outreach activities.

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