Swedish Institute of Space Physics (IRF)
INTEGRATION OF COMPLEMENTARY OBSERVATIONS USING ARISE2 HIGH-LATITUDE INSTRUMENTS
Authors: Johan Kero, Evgenia Belova (IRF, Sweden); Peter Näsholm, Steven Gibbons (NORSAR, Norway); Pieter Smets (KNMI, the Netherlands); Jens Hildebrand, Rolf Rüfenacht, Gunter Stober, Gerd Baumgarten (IAP-KBORN, Germany); Patrick Espy, Robert Hibbins (NTNU, Norway); Niklaus Kämpfer (UBERN, Switzerland); Tero Raita (Sodankylä Geophysical Observatory, Finland)
We present the current status of the WP4 investigation to combine “whole atmosphere” measurements in validating infrasound corrections to atmospheric models. In this study we focus on data from August 18-20, 2016, a period when all ARISE2 high-latitude instruments providing wind measurements were in operation and covers the altitude range from ~0-100 km. The selected period of time covers three ground-truth events in form of ammunition destruction with known blast weights at Hukkakero, Finland, suitable for infrasound propagation modelling. The instruments providing data in the study in addition to the infrasound arrays in Norway, Sweden and Finland are the ALOMAR RMR lidar and the microwave Doppler WInd RAdiometer (WIRA, currently at ALOMAR), the Esrange MST radar (ESRAD), and meteor radars at Esrange, ALOMAR and in Trondheim.
INITIAL RESULTS FROM THE ARISE2 MICROBAROMETER ARRAY DEPLOYED IN KIRUNA, SWEDEN
Authors: Johan Kero, Lars Eliasson, Ludwik Liszka (IRF, Sweden); Alexis Le Pichon, Elisabeth Blanc (CEA, France); Eric Stempels (Uppsala University, Sweden); Tero Raita (Sodankylä Geophysical Observatory, Finland)
IRF has in collaboration with CEA in October 2016 deployed an array of four MB3 microbarometers in Kiruna, Sweden, at a site where continuous infrasound registrations has been performed since October 1973. The long time-series consist of microphone recordings using a 75-m tripartite array. The current Lidström microphones and digital 18 Hz recording systems has been in operation since 1998. The deployed microbarometer array allows evaluating the microphone system performance and its detection threshold. The European Arctic contains several sources of ground-truth events such as repeating explosions and mining activity, which provide useful reference. We present initial results from the system comparison, including bolide events recorded on video by the Swedish Allsky Meteor Network enabling a comparison of video and infrasound triangulation and characterisation.