%0 Journal Article
%A Liu, Lei
%A Morton, Y. Jade
%A Cheng, Pin-Hsuan
%A Amores, Angel
%A Wright, Corwin J.
%A Hoffmann, Lars
%T Concentric Traveling Ionospheric Disturbances (CTIDs) Triggered by the 2022 Tonga Volcanic Eruption
%J JGR / Space physics
%V 128
%N 2
%@ 0148-0227
%C Hoboken, NJ
%I Wiley
%M FZJ-2023-01250
%P e2022JA030656
%D 2023
%X This paper investigates concentric traveling ionospheric disturbances (CTIDs) associated with the Tonga volcanic eruption. Results show that: (a) two types of CTIDs (CTID #1 and CTID #2) were identified that traveled radially from Tonga at the speed of 610–880 m/s (acoustic-mode) and 300–380 m/s (Lamb-mode), respectively. CTID #1 reached 3,800 and 5,000 km away from the eruption location toward the directions of New Zealand and Australia, respectively. CTID #2 propagated persistently for ∼9 hr over New Zealand and Australia. (b) The CTID #2 wavefront changed after 08:35 UT over New Zealand, possibly due to a combination of factors including the anisotropic propagation of CTID #2, the regional geomagnetic declination, and westward-moving Lamb waves. (c) Topside total electron content (TEC) enhancement with a magnitude over two TECu was observed from COSMIC-2 measurements. The enhancement agrees with CTID #1 peak from nearby ground-based TEC observations and could be related to the upward propagation of the F layer’s CTID #1 signatures.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000949132200001
%R 10.1029/2022JA030656
%U https://juser.fz-juelich.de/record/1002268