HRD seminar – Amitabh Nag and Ryan Said, Vaisala, Boulder, CO– 8 December 2014

Dr. Nag presented a seminar on “Performance Characteristics of Lightning Locating Systems with Focus on U.S. NLDN”.

ABSTRACT:

Ground-based or satellite-based lightning locating systems are the most common way to geolocate lightning. Depending upon the frequency range of operation, such systems can also report a variety of characteristics associated with lightning events (channel formation processes, leader pulses, cloud-to-ground return strokes, M-components, ICC pulses, and cloud lightning pulses). We will summarize the various methods to geolocate lightning, both ground-based and satellite-based, and discuss the characteristics of lightning data available from various sources.

Updates were made in 2013 to the U.S. National Lightning Detection Network (NLDN) that has led to performance improvements. Vaisala’s LS7002 sensors have been deployed, replacing the older generation LS7001 and IMPACT sensors. The detection efficiencies, location accuracy, and other performance characteristics of the updated NLDN will be discussed.

 A video recording of the presentation is available on the anonymous ftp site: ftp://ftp.aoml.noaa.gov/hrd/pub/blog/seminars/2014/Nag_HRD_Seminar_20141208.mp4

Dr. Said presented a seminar on “The GLD360 Dataset: Methodology and Performance Preview”.

ABSTRACT:

The Vaisala GLD360 dataset is generated by a global network of sensors sensitive to the Very Low Frequency (VLF; 3–30 kHz) range. Using a combined time-of-arrival and magnetic direction finding technique, the location, time, peak current, and polarity are reported for individual lightning flashes. Challenges intrinsic to long-range lightning detection are discussed in the context of the methodology behind this long-range network. An upcoming refinement to the location algorithm is previewed. Estimates of the detection efficiency, location accuracy, and peak current estimation performance using precision network data as a reference are given using real-time data and reprocessed lightning data generated with the new location algorithm.  

 A video recording of the presentation is available on the anonymous ftp site: ftp://ftp.aoml.noaa.gov/hrd/pub/blog/seminars/2014/Said_HRD_Seminar_20141208.mp4