Finland HF and Esrange MST radar observations of polar mesosphere summer echoes

• Published in: Annales Geophysicae
• Main Authors: Ogawa, T., Arnold, N. F., Kirkwood, S., Nishitani, N., Lester, M.
• Format: Article in Journal/Newspaper
• Language: English
• Published: European Geosciences Union (EGU), Copernicus Publications, Springer Verlag (Germany) 2017
• Subjects: Science & Technology; Physical Sciences; Astronomy & Astrophysics; Geosciences; Multidisciplinary; Meteorology & Atmospheric Sciences; Geology; meteorology and atmospheric dynamics; middle atmosphere dynamics; thermospheric dynamics; waves and tides; instruments and techniques; METEOR ECHOES; VHF RADAR; NETWORK OBSERVATIONS; MESOPAUSE ECHOES; PMSE; SUPERDARN; DYNASONDE; DYNAMICS; CAMPAIGN; EISCAT; Esrange; Leicester
• Online Access: http://www.ann-geophys.net/21/1047/2003/angeo-21-1047-2003.html; http://hdl.handle.net/2381/39328; https://doi.org/10.5194/angeo-21-1047-2003

Peculiar near range echoes observed in summer with the SuperDARN HF radar in Finland are presented. The echoes were detected at four frequencies of 9, 11, 13 and 15 MHz at slant ranges of 105–250 km for about 100 min. Interferometer measurements indicate that the echoes are returned from 80–100 km a...