Single-station narrowband ranging of active storm cells without lightning-type discrimination

Details Single-station narrowband ranging of active storm cells without lightning-type discrimination Single-station narrowband ranging of active storm cells without lightning-type discrimination

Jun 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009jastp..71..911m&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 71, Issue 8-9, p. 911-922.

Physics

Lightning, Narrowband, Electromagnetic, Radiation

Scientific paper

We present a statistical technique for ranging the edges of active storms cell using a very simple narrowband receiver tuned to 1 MHz (the MW band in radio, just below HF frequencies). We show that a principle based on the "30-30 rule" can be used to define practical warning levels. From the measurements carried out in Finland, we show that the narrowband source intensities of cloud-to-ground lightning vary log-normally; this results in a ranging uncertainty of about 20%, which can be reduced if a suitable floating average is used. Based on one storm, we suggest that the differences between intra-cloud and ground-to-cloud signals at 1 MHz are small enough to make an IC-CG discrimination. Eliminating such a discrimination allows all lightning impulses to be used in the range and improves the accuracy, since more flashes are then available as inputs into the distance-estimation algorithm. Although the system is only validated against a single storm, we provide definitions by which this and other narrowband detectors could be independently verified; existing narrowband devices have not been verified in this manner, due in part to a lack of such standardized definitions.

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