Automatic Recognition of Coronal Type II Radio Bursts: The Method for ARBIS 2

Details Automatic Recognition of Coronal Type II Radio Bursts: The Method for ARBIS 2 Automatic Recognition of Coronal Type II Radio Bursts: The Method for ARBIS 2

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsh23a1525l&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SH23A-1525

Astronomy and Astrophysics

Astrophysics

[2139] Interplanetary Physics / Interplanetary Shocks, [7509] Solar Physics, Astrophysics, And Astronomy / Corona, [7534] Solar Physics, Astrophysics, And Astronomy / Radio Emissions, [7924] Space Weather / Forecasting

Scientific paper

The major space weather events like solar flares and coronal mass ejections are usually accompanied by solar radio bursts, which can be used for a real-time space weather forecast. Type II radio bursts are produced near the local electron plasma frequency and near its harmonic by fast electrons accelerated by a shock wave moving through the corona and solar wind with a typical speed of ~1000 km/s. These bursts have dynamic spectra with frequency gradually falling with time (~0.25 MHz s-1), the duration of the coronal burst being several minutes. This paper presents a new method developed to detect coronal radio bursts automatically and describes its implementation in an Automated Radio Burst Identification System (ARBIS 2). The central idea of the implementation is to use the Hough transform for more objective detection of the type II bursts. Preliminary tests of the method with the use of the spectra obtained in 2002 show that the performance of the current implementation is quite high, ~80%, while the probability of false positives is reasonably low, 0.004-0.010 false positives per hour. Prospects for improvements are discussed.

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