Nils Brenning, Department of Plasma Physics, Alfvén Laboratory, Stockholm. Efficient Electromagnetic Radiation from Double Layers? Abstract: A potentially important mechanism for electromagnetic radiation from space is Double Layer Radiation (DL-radiation). This type of radiation is proposed to come from DL-associated, spatially localized high frequency (hf) spikes that are driven by the electron beam on the high-potential side of the double layer. In our experiment the spectrum has high amplitude close to the plasma frequency at the location of the hf spike, several hundred MHz. Fresh results from on-going laboratory experiments will be reported, as well as background and motivation for the project.