Ionosonde and GPS total electron content observations during the 26 December 2019 annular solar eclipse over Indonesia
نویسندگان
چکیده
Abstract. We report the investigation of ionospheric response to passage an annular solar eclipse over Southeast Asia on 26 December 2019 using multiple sets observations. Two ionosondes (one at Kototabang and another Pontianak) were used measure dynamical changes in layer during event. A network ground-based GPS receiver stations Indonesia was derive distribution total electron content (TEC) region. In addition, extreme ultraviolet (EUV) images Sun from Atmospheric Imaging Assembly (AIA) instrument board Solar Dynamics Observatory (SDO) satellite also analyzed determine possible impacts solar-active regions that occurred ionosphere eclipse. found −1.62 −1.90 MHz reductions (24.0 % 27.5 relative reduction) foF2 Pontianak, respectively. The respective TEC Pontianak −4.34 −5.45 TECU (24.9 27.9 reduction). Data both indicate a consistent 34–36 min delay between maximum minimum foF2. corresponding time delays for eclipse-related reduction these two locations 40 16 min, F descend with speed 9–19 m s−1 first half period. apparent rise F-layer height near end period, equivalent vertical drift velocity 44–47 s−1. data mapping along set cross-sectional cuts indicates greatest actually north solar-eclipse path, opposite direction which lunar shadow fell. As central path located just southern equatorial ionization anomaly (EIA) crest, it is suspected such peculiar pattern caused by plasma flow associated fountain effect. Net perturbations computed analyzed, revealed presence some wavelike fluctuations Some observed perturbation patterns propagated matching may be explained terms nonuniform EUV illumination arose as various active went obstructed unobstructed remaining features are likely traveling disturbances (TIDs) generated top other diurnal factors.
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ژورنال
عنوان ژورنال: Annales Geophysicae
سال: 2023
ISSN: ['1432-0576', '0992-7689']
DOI: https://doi.org/10.5194/angeo-41-147-2023