Automatic Whistler Detector and Analyzer system: Automatic Whistler Detector

J. Lichtenberger, C. Ferencz, L. Bodnár, D. Hamar, P. Steinbach

Research output: Contribution to journalArticle

38 Citations (Scopus)

Abstract

A new, unique system has been developed for the automatic detection and analysis of whistlers. The Automatic Whistler Detector and Analyzer (AWDA) system has two purposes: (1) to automatically provide plasmaspheric electron densities extracted from whistlers and (2) to collect statistical data for the investigation of whistler generation and propagation. This paper presents the details of and the first results obtained by the automatic detector segment. The detector algorithm is based on image correlation where the target image is a preprocessed spectrogram of raw. VLF signals and the pattern is a model whistler. The first AWDA system has been working in Tihany, Hungary (L = 1.8), and has collected 100,000 whistler traces per year. The overall detection efficiency using a parameter set optimized for purpose 2 is 90% for misdetection and 50-80% for false detection. The statistical analysis over the period February 2002 to February 2008 including 600,000 whistler traces shows high diurnal variations; whistler were mainly, but not only, detected when both the source and receiver regions were unlit. The seasonal occurrence is high during austral summer and low during austral winter. Comparison with Tarcsai et al's (1988) statistical study on Tihany whistlers shows differences in both diurnal and seasonal variations, but the latter study was made on 1388 manually identified whistlers only. The L value distributions of both data sets are similar. A global network of AWDA systems (AWDAnet) has been set up to overcome the time and space limitations of a single station; the network consists of 13 nodes, and another 6 are envisaged for the near future.

Original languageEnglish
Article numberA12201
JournalJournal of Geophysical Research: Space Physics
Volume113
Issue number12
DOIs
Publication statusPublished - Dec 1 2008

Fingerprint

whistlers
detectors
analyzers
Detectors
diurnal variations
diurnal variation
automatic detection
Hungary
spectrograms
statistical data
annual variations
statistical analysis
space and time
electron density
winter
summer
Carrier concentration
Statistical methods
seasonal variation
receivers

ASJC Scopus subject areas

  • Space and Planetary Science
  • Geophysics

Cite this

Automatic Whistler Detector and Analyzer system : Automatic Whistler Detector. / Lichtenberger, J.; Ferencz, C.; Bodnár, L.; Hamar, D.; Steinbach, P.

In: Journal of Geophysical Research: Space Physics, Vol. 113, No. 12, A12201, 01.12.2008.

Research output: Contribution to journalArticle

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