ENVINET (European network for arctic-alpine multidiciplanary environmental research) is a research infrastructure network focusing on multidisciplinary environmental research in Europe. The network involves representatives from 18 environmental research infrastructures from the European Alps to the Arctic, representatives of their users and representatives from relevant international organizations and networks. The participating infrastructures cover a broad range of environmental sciences primarily within atmospheric physics and chemistry as well as marine and terrestrial biology.
The ENVINET project directory covers data and observation activities at these stations.
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The experiments comprise automated receiving systems for 150 and 400 MHz transmissions from NIMS (formerly known as NNSS) satellites that are used to determine the ionospheric electron content by means of the differential carrier phase method. Receivers are located at Ny-Ålesund, Longyearbyen, Bjørnøya and Tromsø. Measurements of electron content from the receiver network are inverted in a tomographic reconstruction algorithm to yield two-dimensional images of electron density over a wide region. The observations are used to investigate the dynamical processes responsible for the spatial structuring of the plasma distribution in the polar ionosphere. These tomographic images are complementary to measurements made using the EISCAT and EISCAT Svalbard radars and auroral optical instruments located on Svalbard.