Wavenumber‐4 patterns of the total electron content over the low latitude ionosphere

Wan, Weixing; Liu, Libo; Pi, Xiaoqing; Zhang, M.-L.; Ning, Baiqi; Xiong, Juan; Ding, Feng

doi:10.1029/2008gl033755

Cited by 158 publications

(234 citation statements)

References 26 publications

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“…[10] Using the present version of GAIA, described in section 2, we have carried out a 30 day consecutive run in September, which is one of the months when the ionospheric four-peak longitudinal structure becomes dominant according to the observations [e.g., Kil et al, 2008;Liu and Watanabe, 2008;Scherliess et al, 2008;Wan et al, 2008]. As the initial condition, we used results from noncoupled simulations using each atmospheric GCM and ionospheric model.…”

Section: Resultsmentioning

confidence: 99%

Vertical connection from the tropospheric activities to the ionospheric longitudinal structure simulated by a new Earth's whole atmosphere-ionosphere coupled model

et al. 2011

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[1] This paper introduces a new Earth's atmosphere-ionosphere coupled model that treats seamlessly the neutral atmospheric region from the troposphere to the thermosphere as well as the thermosphere-ionosphere interaction including the electrodynamics selfconsistently. The model is especially useful for the study of vertical connection between the meteorological phenomena and the upper atmospheric behaviors. As an initial simulation using the coupled model, we have carried out a 30 day consecutive run in September. The result reveals that the longitudinal structure of the F-region ionosphere varies on a day-to-day basis in a highly complex way and that a four-peak structure of the daytime equatorial ionization anomaly (EIA) similar to the recent observations appears as an averaged feature. The simulation reproduces and thus confirms the vertical coupling processes proposed so far with respect to the formation of the averaged EIA longitudinal structure; the excitation of solar nonmigrating tides in the troposphere, their propagation through the middle atmosphere, and the modulation of ionospheric dynamo, which in turn affects EIA generation. The simulation result indicates that not only the ionospheric averaged longitudinal structure but also the day-to-day variation can be modulated significantly by the lower atmospheric effect.

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Section: Resultsmentioning

confidence: 99%

Vertical connection from the tropospheric activities to the ionospheric longitudinal structure simulated by a new Earth's whole atmosphere-ionosphere coupled model

et al. 2011

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“…The largest amplitude WN4 variations in TEC appear during equinox and summer months, the variations being relatively weaker or absent in winter months. No significant dependencies on solar cycle have been reported (Scherliess et al, 2008;Wan et al, 2008).…”

Section: Introductionmentioning

confidence: 97%

WN4 effect on longitudinal distribution of different ion species in the topside ionosphere at low latitudes by means of DEMETER, DMSP-F13 and DMSP-F15 data

et al. 2009

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Abstract. Plasma probe data from DMSP-F13, DMSP-F15 and DEMETER satellites were used to examine longitudinal structures in the topside equatorial ionosphere during fall equinox conditions of 2004 year. Since the launch of DEME-TER satellite on 29 June 2004, all these satellites operate close together in the topside ionosphere. Here, data taken from Special Sensor-Ion, Electron and Scintillations (SSIES) instruments on board DMSP-F13, F15 and Instrument Analyser de Plasma (IAP) on DEMETER, are used. Longitudinal variations in the major ions at two altitudes (∼730 km for DEMETER and ∼840 km for DMSP) are studied to further describe the recently observed "wavenumber-four" (WN4) structures in the equatorial topside ionosphere. Different ion species H + , He + and O + have a rather complex longitudinal behavior. It is shown that WN4 is almost a regular feature in O + the density distribution over all local times covered by these satellites. In the evening local time sector, H + ions follow the O + behavior within WN4 structures up to the premidnight hours. Near sunrise H + and later in the daytime, He + longitudinal variations are out of phase with respect to O + ions and effectively reduce the effect of WN4 on total ion density distribution at altitudes 730-840 km. It is shown that both a WN4 E × B drift driver and local F-region winds must be considered to explain the observed ion composition variations.

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“…A prominent wave-4 longitudinal structure is reported by a number of satellite observations (Sagawa et al 2005;Immel et al 2006;England et al 2006b;Lin et al 2007;Lühr et al 2007;Kil et al 2008Kil et al , 2015Pedatella et al 2008;Scherliess et al 2008;Wan et al 2008;Liu et al 2009;Kwak et al 2012) and simulations Jin et al 2008;Ren et al 2010). These wave-4 structures are believed to be caused by the non-migrating DE3 tide (Hagan and Forbes 2002;Henderson et al 2005;Sagawa et al 2005;England et al 2006a;Immel et al 2006).…”

Section: Introductionmentioning

confidence: 99%

Longitudinal structure in electron density at mid-latitudes: upward-propagating tidal effects

Wang

Zhang

2017

Earth Planets Space

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This work studies the upward-propagating migrating and non-migrating tidal effects from the lower atmosphere on the longitudinal variation of electron density ( Ne) in both the E and F regions at mid-latitudes during the 2002 March equinox. A total of 12 runs are conducted using the Thermosphere Ionosphere Electrodynamic General Circulation model for theoretical investigation. The Ne at altitudes above 200 km is affected by upward-propagating tides, with maximum values attained around 300 km. Migrating tides result in reduced longitudinal differences in the Ne over North America and in the Southern Hemisphere, while non-migrating tides induce a wave-4 pattern in both hemispheres. The non-migrating effect is weaker than the migrating effect after penetrating into the F region. The neutral composition (i.e., ratio of atom oxygen to molecular nitrogen) is dominant in regulating the Ne in both the migrating (accounting for approximately 64%) and non-migrating (about 60%) tidal penetration processes. TheNe caused by the tidal meridional wind (accounting for approximately 70%) is stronger than the tidal zonal wind (about 30%) under both the migrating and non-migrating tidal conditions, except in the Southern Hemisphere under migrating tidal input. This work contributes to our understanding of the mechanisms for the longitudinal modulation of the Ne at mid-latitudes.

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Wavenumber‐4 patterns of the total electron content over the low latitude ionosphere

Cited by 158 publications

References 26 publications

Vertical connection from the tropospheric activities to the ionospheric longitudinal structure simulated by a new Earth's whole atmosphere-ionosphere coupled model

Vertical connection from the tropospheric activities to the ionospheric longitudinal structure simulated by a new Earth's whole atmosphere-ionosphere coupled model

WN4 effect on longitudinal distribution of different ion species in the topside ionosphere at low latitudes by means of DEMETER, DMSP-F13 and DMSP-F15 data

Longitudinal structure in electron density at mid-latitudes: upward-propagating tidal effects

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