Ionosonde and GPS total electron content observations during the 26 December 2019 annular solar eclipse over Indonesia

Abstract - 1.62 and - 1.90  MHz reductions (24.0 % and 27.5 % relative reduction) in fo - 4.34 and - 5.45  TECU (24.9 % and 27.9 % relative reduction). Data from both ionosondes indicate a consistent 34–36 min delay between maximum eclipse and minimum fo m s - 1 during the first half of the eclipse period. We also found an apparent rise in the ionospheric F-layer height near the end of the solar eclipse period, equivalent to a vertical drift velocity of 44–47 m s - 1. The GPS TEC data mapping along a set of cross-sectional cuts indicates that the greatest TEC reduction actually occurred to the north of the solar-eclipse path, opposite of the direction from which the lunar shadow fell. As the central path of the solar eclipse was located just to the north of the southern equatorial ionization anomaly (EIA) crest, it is suspected that such a peculiar TEC reduction pattern was caused by plasma flow associated with the equatorial fountain effect. Net perturbations of TEC were also computed and analyzed, which revealed the presence of some wavelike fluctuations associated with the solar-eclipse event. Some of the observed TEC perturbation patterns that propagated with a velocity matching the lunar shadow may be explained in terms of nonuniform EUV illumination that arose as various active regions on the Sun went obstructed and unobstructed during the eclipse. The remaining wavelike features are likely to be traveling ionospheric disturbances (TIDs) generated by the passage of the solar eclipse on top of other diurnal factors.

Object Details

• Location: Deutsche Nationalbibliothek Frankfurt am Main
• Extent: Online-Ressource
• Language: Englisch

References and Relationships

• Bibliographic citation: Ionosonde and GPS total electron content observations during the 26 December 2019 annular solar eclipse over Indonesia ; volume:41 ; number:1 ; year:2023 ; pages:147-172 ; extent:26 ; Annales geophysicae ; 41, Heft 1 (2023), 147-172 (gesamt 26)

Contributors, Places and Time

• Creator: Harjosuwito, Jiyo ; Husin, Asnawi ; Dear, Varuliantor ; Muhamad, Johan ; Faturahman, Agri ; Bahar, Afrizal ; Syetiawan, Agung ; Pradipta, Rezy

Further information

• DOI: 10.5194/angeo-41-147-2023
• URN: urn:nbn:de:101:1-2023042005292813217660
• Rights: Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.
• Last update: 14.08.2025, 11:02 AM CEST