Signatures of the 3‐day wave in the low‐latitude and midlatitude ionosphere during the January 2010 URSI World Day campaign

Liu, Guiping; England, S.; Immel, T. J.; Kumar, Karanam Kishore; Ramkumar, Geetha; Гончаренко, Л. П.

doi:10.1029/2012ja017588

Cited by 30 publications

(61 citation statements)

References 56 publications

(63 reference statements)

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“…In addition, the ultra fast Kelvin wave (UFKW), which is capable of propagating directly from the lower atmosphere to the lower thermosphere due to its long vertical wavelength [ Forbes , ; Chang et al , ; Gu et al , ], has also been found to induce similar wave signals in the ionosphere through electro dynamo processes [ Forbes , ; Liu et al , ]. The global distributions of the UFKW signals in TEC also agree well with the equatorial fountain effect [ Chang et al , ; Liu et al , ; Gu et al , ].…”

Section: Introductionmentioning

confidence: 70%

“…The large‐scale waves in the MLT region play an important role in the neutral‐ionosphere coupling through E region electrodynamics [ Forbes , ; Ren et al , ; Wan et al , ; Liu et al , ; Pancheva et al , ; Liu and Richmond , ]. For example, the wave number‐4 structures (WN4) in the ionosphere are believed to be related to the eastward diurnal tide with zonal wave number 3 (DE3) through E region wind dynamo [ England et al , ; Wan et al , ].…”

Section: Introductionmentioning

confidence: 99%

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Observation of the neutral‐ion coupling through 6 day planetary wave

Liu

et al. 2014

JGR Space Physics

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A westward 6 day oscillation with zonal wave number 1 is identified in the global maps of the ionospheric total electron content (TEC) during May 2003. This signature coincides with the wave activities in the mesosphere and lower thermosphere (MLT) region with a similar zonal structure and period, deduced from the temperature and wind observations from the Thermosphere Ionosphere and Mesosphere Electric Dynamics (TIMED) satellite. The vertical wavelength of this 6 day wave is estimated to be~65 km, which enables it to propagate up into the lower thermosphere and therefore modulate the ionosphere through E region wind dynamo. The zonal wind perturbations of the 6 day wave maximize in the equatorial region with an amplitude of~30 m/s and the meridional wind perturbations peak at middle latitudes with an amplitude of 15-20 m/s. The 6 day oscillation in TEC peaks at the geomagnetic equatorial ionization anomaly (EIA) crests in both hemispheres with a deep minimum at the equator. The absolute TEC perturbations maximize at~1400-1800 LT with an amplitude of~9 (~7) total electron content unit (TECU; 1 TECU = 10 16 m À2 ) in the southern (northern) hemisphere, which account for~16% (~10%) of the background TEC. Larger relative TEC perturbations of~20% are found at 0200-0400 LT. The similar wave number-period spectra and the consistent temporal variations of the 6 day periodical signatures in both neutral atmosphere and ionosphere suggest a strong neutral-ion coupling through planetary wave.

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Section: Introductionmentioning

confidence: 70%

Section: Introductionmentioning

confidence: 99%

Observation of the neutral‐ion coupling through 6 day planetary wave

Liu

et al. 2014

JGR Space Physics

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“…It might be possible that the UFK wave indirectly impacts the ionosphere through this mechanism. A subsequent study by Liu et al (2012) observed this same 3-day wave signature in the top side of ionosphere at mid-latitude, and suggested that the UFK wave oscillations were transmitted through modulations of the ionospheric dynamo in the lower latitudes.…”

Section: Discussionmentioning

confidence: 98%

The ultra-fast Kelvin waves in the equatorial ionosphere: observations and modeling

2013

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The main purpose of this study is to investigate the vertical coupling between the mesosphere and lower thermosphere (MLT) region and the ionosphere through ultra-fast Kelvin (UFK) waves in the equatorial atmosphere. The effect of UFK waves on the ionospheric parameters was estimated using an ionospheric model which calculates electrostatic potential in the E-region and solves coupled electrodynamics of the equatorial ionosphere in the E- and F-regions. The UFK wave was observed in the South American equatorial region during February–March 2005. The MLT wind data obtained by meteor radar at São João do Cariri (7.5° S, 37.5° W) and ionospheric F-layer bottom height (<I>h</I>'F) observed by ionosonde at Fortaleza (3.9° S; 38.4° W) were used in order to calculate the wave characteristics and amplitude of oscillation. The simulation results showed that the combined electrodynamical effect of tides and UFK waves in the MLT region could explain the oscillations observed in the ionospheric parameters

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“…Thus, the enhanced vertical drift of the evening F layer (that is, the post-sunset rise of the layer), due to the PRE in the zonal electric of dynamo electric field that was responsible for the 3-day wave in the EIA as seen in the Lomb-scargle periodogram of the IGS TEC presented in Fig. 6b (Liu et al 2012). UFK wave activity can cause also significant modulation in the equatorial evening prereversal vertical drift (PRE) and consequently in the development of post-sunset spread F (ESF) plasma bubble irregularities.…”

Section: Gravity Wave Effects On Equatorial Spread Fmentioning

confidence: 99%

“…6a (Liu et al 2012). Three-day oscillation, centered at the equator, is clearly defined, with the upward propagation of the wave being evident from the delay in the peak intensity seen with increasing heights.…”

Section: The Variabilities Defining Ionospheric Weathermentioning

confidence: 99%

Electrodynamics of ionospheric weather over low latitudes

Abdu

2016

Geosci. Lett.

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The dynamic state of the ionosphere at low latitudes is largely controlled by electric fields originating from dynamo actions by atmospheric waves propagating from below and the solar wind-magnetosphere interaction from above. These electric fields cause structuring of the ionosphere in wide ranging spatial and temporal scales that impact on space-based communication and navigation systems constituting an important segment of our technology-based day-to-day lives. The largest of the ionosphere structures, the equatorial ionization anomaly, with global maximum of plasma densities can cause propagation delays on the GNSS signals. The sunset electrodynamics is responsible for the generation of plasma bubble wide spectrum irregularities that can cause scintillation or even disruptions of satellite communication/navigation signals. Driven basically by upward propagating tides, these electric fields can suffer significant modulations from perturbation winds due to gravity waves, planetary/Kelvin waves, and non-migrating tides, as recent observational and modeling results have demonstrated. The changing state of the plasma distribution arising from these highly variable electric fields constitutes an important component of the ionospheric weather disturbances. Another, often dominating, component arises from solar disturbances when coronal mass ejection (CME) interaction with the earth's magnetosphere results in energy transport to low latitudes in the form of storm time prompt penetration electric fields and thermospheric disturbance winds. As a result, drastic modifications can occur in the form of layer restructuring (Es-, F3 layers etc.), large total electron content (TEC) enhancements, equatorial ionization anomaly (EIA) latitudinal expansion/contraction, anomalous polarization electric fields/vertical drifts, enhanced growth/suppression of plasma structuring, etc. A brief review of our current understanding of the ionospheric weather variations and the electrodynamic processes underlying them and some outstanding questions will be presented in this paper.

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Signatures of the 3‐day wave in the low‐latitude and midlatitude ionosphere during the January 2010 URSI World Day campaign

Cited by 30 publications

References 56 publications

Observation of the neutral‐ion coupling through 6 day planetary wave

Observation of the neutral‐ion coupling through 6 day planetary wave

The ultra-fast Kelvin waves in the equatorial ionosphere: observations and modeling

Electrodynamics of ionospheric weather over low latitudes

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