Black hole collisions generally are not expected to result in electromagnetic emissions and none were detected. (sciencedaily.com)
Winds are estimated by using an upward - looking Doppler radar, while temperature and moisture profiles are evaluated by using a vertically pointing radiometer that measures electromagnetic emissions of selected wavelengths at various heights in the troposphere. (britannica.com)
The satellite data is being combined with that collected by the National Lightning Detection Network and from a network of sensors that measure low - frequency electromagnetic emissions, or «sferics,» and changes in the direction of the electric field. (scientificamerican.com)