Survey of conditions for artificial aurora experiments by the second electron gyro-harmonic at EISCAT Troms? using dynasonde data

• Published in: Earth, Planets and Space
• Main Authors: Tsuda, T. T., Rietveld, Michael T, Kosch, M.J, Oyama, S, Ogawa, Y, Hosokawa, K., Nozawa, S, Kawabata, T, Mizuno, A
• Format: Article in Journal/Newspaper
• Language: English
• Published: Springer Open 2018
• Subjects: VDP::Mathematics and natural science: 400::Physics: 430::Electronics: 435; VDP::Matematikk og Naturvitenskap: 400::Fysikk: 430::Elektronikk: 435; VDP::Mathematics and natural science: 400::Physics: 430::Electromagnetism; acoustics; optics: 434; VDP::Matematikk og Naturvitenskap: 400::Fysikk: 430::Elektromagnetisme; akustikk; optikk: 434; Artifcial aurora; Ionospheric heating; Second electron gyro-harmonic; EISCAT; Tromsø; Dynasonde; Troms
• Online Access: https://hdl.handle.net/10037/14863; https://doi.org/10.1186/s40623-018-0864-y

Source at https://doi.org/10.1186/s40623-018-0864-y . We report a brief survey of matching conditions for artificial aurora optical experiments utilizing the second electron gyro-harmonic (2.7-MHz frequency) in F region heating with O-mode at the EISCAT Tromsø site using dynasonde data from 2000 to 2017. Our survey indicates the following: The possible conditions for successful artificial aurora experiments are concentrated on twilight hours in both evening and morning, compared with late night hours; the possible conditions appear in fall, winter, and spring, while there is no chance in summer, and the month-to-month variation among fall, winter, and spring is not so clear; the year-to-year variation is well correlated with the solar activity. These characteristics in the case of 2.7-MHz frequency are basically similar to those previously reported in the case of 4-MHz frequency. However, the number of days meeting the possible condition in the case of 2.7-MHz frequency is obviously large, compared with that in the case of 4-MHz frequency. In particular, unlike the 4-MHz frequency operation, the 2.7-MHz frequency operation can provide many chances for successful artificial aurora experiments even during the solar minimum.