Detecting ionospheric disturbances using GPS without aliasing caused by non-uniform spatial sampling: Algorithm, validation and illustration

Shimna, K.; Vijayan, M. Sithartha Muthu

doi:10.1016/j.jastp.2020.105400

Cited by 1 publication

(1 citation statement)

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“…Figure 3 illustrates the keograms of the filtered TECs of New Zealand and Australia (Figures 3a and 3c) and Japan (Figures 3b and 3d). It is noteworthy that only TEC observations with elevation angle >30° are utilized to mitigate the effect from the non‐uniform spatial interval of ionospheric‐pierce‐points (Shimna & Vijayan, 2020). As the filtered TECs over Japan are mapped to the southern hemisphere, the distances to the volcano are counted from their southern hemisphere magnetic conjugate locations.…”

Section: Gnss Tec Observationsmentioning

confidence: 99%

Rapid Conjugate Appearance of the Giant Ionospheric Lamb Wave Signatures in the Northern Hemisphere After Hunga‐Tonga Volcano Eruptions

Lin¹,

Rajesh²,

Lin³

et al. 2022

Geophysical Research Letters

111

128

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The explosive eruption of the Hunga‐Tonga volcano in the southwest Pacific at 0415UT on 15 January 2022 triggered gigantic atmospheric disturbances with surface air pressure waves propagating around the globe in Lamb mode. In space, concentric traveling ionosphere disturbances (CTIDs) are also observed as a manifestation of air pressure waves in New Zealand ∼0500UT and Australia ∼0630UT. As soon as the air pressure waves reached central Australia ∼0800UT, conjugate CTIDs appeared almost simultaneously in the northern hemispheres through interhemispheric coupling, much earlier than the arrival of the surface air pressure waves to Japan after 1100UT. Combining observations over Australia and Japan between 0800 and 1000UT, both direct and conjugate CTIDs show similar horizontal phase velocities of 320–390 m/s, matching with the dispersion relation of Lamb mode. The arrival of atmospheric Lamb wave to Japan later created in situ CTIDs showing the same Lamb mode characteristics as the earlier conjugate CTIDs.

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Section: Gnss Tec Observationsmentioning

confidence: 99%