J/ApJ/710/L58ivo://CDS.VizieR/J/ApJ/710/L58doi:10.26093/cds/vizier.17109058CDSLobzin V.V.Cairns I.H.Robinson P.A.Steward G.Patterson G.2012-05-07T10:05:52Z2012-04-20T07:46:38ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frthe-sunradio-sourcesMajor space weather events such as solar flares and coronal mass ejections are usually accompanied by solar radio bursts, which can potentially be used for real-time space weather forecasts. Type II radio bursts are produced near the local plasma frequency and its harmonic by fast electrons accelerated by a shock wave moving through the corona and solar wind with a typical speed of ~1000km/s. The coronal bursts have dynamic spectra with frequency gradually falling with time and durations of several minutes. This Letter presents a new method developed to detect type II coronal radio bursts automatically and describes its implementation in an extended Automated Radio Burst Identification System (ARBIS 2). Preliminary tests of the method with 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, with one false positive per 100-200hr for high solar activity and less than one false event per 10000hr for low solar activity periods. The first automatically detected coronal type II radio burst is also presented.2010ApJ...710L..58Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/710/L58CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/ApJ/710/1111 : Interplanetary shocks radio bursts (Gopalswamy+, 2010)J/A+AS/119/489 : Solar Type II Radio Bursts, 1990.09 - 1993.12 (Mann+ 1996)ftp://ftp.ngdc.noaa.gov/STP/SOLAR_DATA/SOLAR_RADIO/SPECTRAL/2002/SPEC_NEW.02 :https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/710/L58https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/710/L58http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/710/L58https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/710/L58https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/710/L58http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/710/L58GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapRadiodefaultJ/ApJ/710/L58/table1Type II radio bursts observed at Learmonth observatory in 2002Int[1,3] Intensitymeta.codeintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeq? Event number (1)meta.idintnullablem_Seq[ab] Combined events have the same "Seq" number followed by letters a and bmeta.code.multipcharObsDate of the observationtime.epochnullableStimeUT start timetime.epochnullableEtimeUT end timetime.epochnullableSfreqStart frequencyMHztime.start;em.freqintu_Sfreq[:] Uncertainty flag on Sfreqmeta.code.errorcharEfreqEnd frequencyMHztime.end;em.freqintu_Efreq[:] Uncertainty flag on Efreqmeta.code.errorcharTrue[0/1]? Number of true positives in daily spectrameta.numberintnullablef_True[dn] event not taken into account (2)meta.codecharFalse[0,3]? Number of false alarms in daily spectrameta.numberintnullablef_False[dn] event not taken into account (2)meta.codechar