Abstract
Abstract This article presents a review of broad band electric field measurements recently performed near thunderstorm areas. It is shown that large lightning pulses propagate up to the upper ionosphere, where they are reflected, producing natural ionograms. Lightning and sprite electric fields are characterised in different frequency bands and localised. The distance between sprite and parent lightning reaches ten kilometres. Transient MF signals are recorded simultaneously with some sprites. In addition short term fading of MF radio link signals are observed after lightning due to an increased absorption in the lower ionosphere induced by thermal electron heating. Their horizontal extension is larger than 200 km which is comparable with the extension of elves which are the luminous counterpart of the effects of lightning in the ionosphere.
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