Abstract
Solar eclipse passage can cause some change in the ionosphere, which makes it a valuable event to be studied using multi-instruments. On 26 December 2019, an annular solar eclipse passed in the vicinity of Equatorial Atmosphere Radar (EAR) at Kototabang station. We utilize the EAR's capability to detect field-aligned irregularities (FAI) to discover changes in the ionosphere during the eclipse. Other instruments also supported the EAR observation. The results of EAR observations show some appearance of FAI (strong echo power backscatter) at the altitude of ionospheric E layers (90–100 km) during the solar eclipse. Traces of strong sporadic E layers (with spread) were also observed on ionograms from the FMCW ionosonde at the exact location, confirming the EAR observation. The appearance of FAI and these sporadic E layers were likely to be related to the solar eclipse event. The results of several other studies also supported this hypothesis. On the eclipse day, we found that the ordinarily occurring FAI at 150 km altitude disappeared; meanwhile, on 25 and 27 December 2019, the 150 km altitude FAI was observed. We suspect that the absence of FAI at the height of 150 km was related to the solar eclipse phenomena. Another interesting finding is a spread echo backscatter around noon on 25 December 2019, one day before the eclipse.
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References
Chen, G., Zhao, Z., Zhou, C., Yang, G., Zhang, Y.: Solar eclipse effects of 22 July 2009 on sporadic-E. Ann. Geophys. 28(2), 353–357 (2010). https://doi.org/10.5194/angeo-28-353-2010
Chen, G., Jin, H., Yan, J., Zhang, S., Li, G., Yokoyama, T., Yang, G., Yan, C., Wu, C., Wang, J., Zhong, D., Li, Y., Wang, Z.: Low-latitude daytime F region irregularities observed in two geomagnetically quiet days by the Hainan coherent scatter phased array radar (HCOPAR). J. Geophys. Res. Space Phys. 122(2), 2645–2654 (2017). https://doi.org/10.1002/2016JA023628
Chen, G., Zhao, Z., Zhang, Y., Yang, G., Zhou, C., Huang, S., Li, T., Li, N., Sun, H.: Gravity waves and spread Es observed during the solar eclipse of 22 July 2009. J. Geophys. Res. Space Physics 116(9), 1–7 (2011). https://doi.org/10.1029/2011JA016720
Choudhary, R.K., Mahajam, K.K., Singh, S., Kumar, K.: First VHF radar observations of tropical latitude E-region field aligned irregularities. Geophysical Research Letterse 23(25), 3683–3686 (1996)
Dear, V., Husin, A., Anggarani, S., Harjosuwito, J., Pradipta, R.: Ionospheric effects during the total solar eclipse over Southeast Asia-Pacific on 9 March 2016: part 1 vertical movement of plasma layer and reduction in electron plasma density. J. Geophys. Res. Space Phys. 125(5), 1–15 (2020). https://doi.org/10.1029/2019JA026708
Fukao, S., Hashiguchi, H., Yamamoto, M., Tsuda, T.: Equatorial atmosphere radar (EAR ): system description and first results. Radio Sci. 38(3) (2003). https://doi.org/10.1029/2002RS002767
Patra, A.K., Choudhary, R.K., St-Maurice, J.P.: Solar eclipse-induced E-region plasma irregularities observed by the Gadanki radar. Geophys. Res. Lett. 36(13), 3–7 (2009). https://doi.org/10.1029/2009GL038669
Patra,A.K., Pavan Chaitanya, P., St. Maurice, J.P., Otsuka, Y., Yokoyama, T., Yamamoto, M.: The solar flux dependence of ionospheric 150 km radar echoes and implications. Geophys. Res. Lett., 44(22), 11,257–11,264 (2017). https://doi.org/10.1002/2017GL074678
Patra, A.K., Pavan Chaitanya, P., Tiwari, D.: Characteristics of 150 km echoes linked with solar eclipse and their implications to the echoing phenomenon. J. Geophys. Res. Space Phys. 116(A5), 1–9 (2011). https://doi.org/10.1029/2010ja016258
Patra, A.K., Sripathi, S., Rao, P.B., Choudhary, R.K.: Gadanki radar observations of daytime E region echoes and structures extending down to 87 km. Ann. Geophys. 24(7), 1861–1869 (2006). https://doi.org/10.5194/angeo-24-1861-2006
Acknowledgements
The Equatorial Atmosphere Radar (EAR) belongs to the Research Institute for Sustainable Humanosphere (RISH), Kyoto University. The EAR was operated under international collaboration between RISH and the National Institute of Aeronautics and Space of Indonesia (LAPAN). We would like to thank RISH for providing and sharing this EAR data.
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Faturahman, A., Dear, V., Jiyo, Bahar, A., Husin, A., Pradipta, R. (2022). Ionospheric Observation Using Equatorial Atmosphere Radar (EAR) Kototabang for the 26 December 2019 Annular Solar Eclipse Research. In: Yulihastin, E., Abadi, P., Sitompul, P., Harjupa, W. (eds) Proceedings of the International Conference on Radioscience, Equatorial Atmospheric Science and Environment and Humanosphere Science, 2021. Springer Proceedings in Physics, vol 275. Springer, Singapore. https://doi.org/10.1007/978-981-19-0308-3_23
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DOI: https://doi.org/10.1007/978-981-19-0308-3_23
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