Observational evidence of ionospheric migrating tide modification during the 2009 stratospheric sudden warming

J. T. Lin, Chien-Hung Lin, L. C. Chang, H. H. Huang, J. Y. Liu, Bing-Chih Chen, Chia-Hung Chen, C. H. Liu

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

In this paper, modifications of the ionospheric tidal signatures during the 2009 stratospheric sudden warming (SSW) event are studied by applying atmospheric tidal analysis to ionospheric electron densities observed using radio occultation soundings of FORMOSAT-3/COSMIC. The tidal analysis indicates that the zonal mean and major migrating tidal components (DW1, SW2 and TW3) decrease around the time of the SSW, with 1.5-4 hour time shifts in the daily time of maximum around EIA and middle latitudes. The typical ionospheric SSW signature: a semi-diurnal variation of the ionospheric electron density, featuring an earlier commencement and subsidence of EIA, can be reproduced by differencing the migrating tides before and during the SSW period. Our results also indicate that the migrating tides represent ∼80% of the ionospheric tidal components at specific longitudes, suggesting that modifications of the migrating tides may be the major driver for producing ionospheric changes observed during SSW events, accounting for greater variability than the nonmigrating tides that have been the focus of previous studies.

Original languageEnglish
Article numberL02101
JournalGeophysical Research Letters
Volume39
Issue number2
DOIs
Publication statusPublished - 2012 Jan 1

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tides
ionospherics
tide
heating
ionospheric electron density
electron density
signatures
COSMIC
radio occultation
diurnal variations
subsidence
sounding
diurnal variation
sudden stratospheric warming
radio
shift
analysis

All Science Journal Classification (ASJC) codes

  • Earth and Planetary Sciences(all)
  • Geophysics

Cite this

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title = "Observational evidence of ionospheric migrating tide modification during the 2009 stratospheric sudden warming",
abstract = "In this paper, modifications of the ionospheric tidal signatures during the 2009 stratospheric sudden warming (SSW) event are studied by applying atmospheric tidal analysis to ionospheric electron densities observed using radio occultation soundings of FORMOSAT-3/COSMIC. The tidal analysis indicates that the zonal mean and major migrating tidal components (DW1, SW2 and TW3) decrease around the time of the SSW, with 1.5-4 hour time shifts in the daily time of maximum around EIA and middle latitudes. The typical ionospheric SSW signature: a semi-diurnal variation of the ionospheric electron density, featuring an earlier commencement and subsidence of EIA, can be reproduced by differencing the migrating tides before and during the SSW period. Our results also indicate that the migrating tides represent ∼80{\%} of the ionospheric tidal components at specific longitudes, suggesting that modifications of the migrating tides may be the major driver for producing ionospheric changes observed during SSW events, accounting for greater variability than the nonmigrating tides that have been the focus of previous studies.",
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Observational evidence of ionospheric migrating tide modification during the 2009 stratospheric sudden warming. / Lin, J. T.; Lin, Chien-Hung; Chang, L. C.; Huang, H. H.; Liu, J. Y.; Chen, Bing-Chih; Chen, Chia-Hung; Liu, C. H.

In: Geophysical Research Letters, Vol. 39, No. 2, L02101, 01.01.2012.

Research output: Contribution to journalArticle

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AU - Chen, Bing-Chih

AU - Chen, Chia-Hung

AU - Liu, C. H.

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