Global ionospheric response to nonmigrating DE3 and DE2 tides forced from below

Mukhtarov, Plamen; Pancheva, D.

doi:10.1029/2010ja016099

Cited by 35 publications

(72 citation statements)

References 55 publications

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“…The phases (not shown) in both datasets show that the migrating diurnal tide maximizes around 14 hours solar local time at all locations throughout the mid and low latitude area. These results are again indicative that the migrating diurnal tide in TEC reflects photoionization, consistent with the observations of Mukhtarov and Pancheva (2011) in F3/C electron density.…”

Section: Resultssupporting

confidence: 79%

“…Compared to the zonal mean and migrating diurnal tide, the migrating semidiurnal tide in TECs exhibits a clear bimodal (a) (b) structure in latitude, with peaks located roughly at 15° latitude in both hemispheres, consistent with the location of the EIAs. Mukhtarov and Pancheva (2011) suggested that a similar bimodal distribution observed in electron densities near 400 km is indicative of upwards coupling of the migrating semidiurnal tide in the MLT region via the equatorial fountain mechanism. The seasonal variation is again semiannual in nature with maxima (minima) in the postequinox (post-solstice) periods at the same times as those in the zonal mean and migrating diurnal tide.…”

Section: Resultsmentioning

confidence: 77%

“…For this study, the TEC corresponding to each occultation was computed by integrating electron densities with respect to height, between 200 -800 km. Although F3/C TECs will not include contributions above 800 km, past ionospheric tidal structure studies by Mukhtarov and Pancheva (2011) have found that the migrating diurnal, semidiurnal, and DE3 tides examined here all peak between roughly 300 -500 km altitude. Similar to the methodology of Lin et al (2012), occultations containing negative electron densities or with values exceeding 2 × 10 6 cm -3 were deemed erroneous and discarded.…”

Section: Methodsmentioning

confidence: 99%

“…Results from such frequency-wavenumber tidal decomposition have found that along with the zonal mean field, the migrating tidal components comprise most of the normal quiet-time variation in the ionosphere, including diurnal plasma uplift from the equatorial fountain to form the equatorial ionization anomalies (EIAs), as well as that resulting from in-situ photoionization (Mukhtarov and Pancheva 2011;Lin et al 2012). In addition to the aforementioned sources, migrating ionospheric tidal components can also reflect changes arising from migrating tides in the middle and lower atmosphere, making the contribution of in-situ ionospheric migrating tidal sources difficult to separate from lower atmospheric sources (Mukhtarov and Pancheva 2011).…”

Section: Introductionmentioning

confidence: 99%

“…In addition to the aforementioned sources, migrating ionospheric tidal components can also reflect changes arising from migrating tides in the middle and lower atmosphere, making the contribution of in-situ ionospheric migrating tidal sources difficult to separate from lower atmospheric sources (Mukhtarov and Pancheva 2011). Nonetheless, migrating tidal modulation by nonlinearly-interacting propagating planetary waves has been suggested as a possible medium for transmitting multi-day planetary wave periodicities into the ionosphere (Pancheva et al 2006).…”

Section: Introductionmentioning

confidence: 99%

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A Statistical Comparison of Zonal Mean and Tidal Signatures in FORMOSAT-3/COSMIC and Ground-Based GPS TECs

Chang¹,

Lin²,

Liu³

2013

Terr. Atmos. Ocean. Sci.

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Atmospheric tidal components in the ionosphere can reflect either the in-situ generated quiet-time variation in the ionosphere, or vertically propagating tidal components generated through coupling to lower or middle atmosphere phenomena. Frequency-wavenumber tidal decomposition is a valuable tool for isolating the primary tidal components that drive the dynamics of the middle and upper atmosphere, allowing temporal and spatial variability to be quantified in a systematic manner, provided sufficient local time sampling. To date, two commonly used data sources for such tidal studies in the ionosphere are the FORMOSAT-3/COSMIC (F3/C) satellite constellation and ground-based GPS-derived Global Ionosphere Maps (GIMs). In this study, the migrating diurnal and semidiurnal tidal components, the nonmigrating diurnal eastward 3 (DE3) component, as well as the zonal mean component that dominate quiet-time ionospheric variability are extracted from 2008 F3/C and GIM Total Electron Content (TEC) data, using integration times of 20 days. We find that the zonal mean and tidal TEC components in F3/C and ground-based GIM data show qualitatively similar seasonal variability and spatial structure. However, the maximum amplitudes of the zonal mean and migrating tidal components computed from F3/C are consistently smaller than those from the ground-based GIMs, revealing a systematic difference between the two datasets. Conversely, the DE3 amplitudes are generally larger in F3/C compared to GIM, potentially due to the higher zonal wavenumber of that component.

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Section: Resultssupporting

confidence: 79%

Section: Resultsmentioning

confidence: 77%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

A Statistical Comparison of Zonal Mean and Tidal Signatures in FORMOSAT-3/COSMIC and Ground-Based GPS TECs

Chang¹,

Lin²,

Liu³

2013

Terr. Atmos. Ocean. Sci.

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Structure and origins of the Weddell Sea Anomaly from tidal and planetary wave signatures in FORMOSAT‐3/COSMIC observations and GAIA GCM simulations

et al. 2015

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The Weddell Sea Anomaly (WSA) is a recurrent feature of the austral summer midlatitude ionosphere where electron densities are observed to maximize during the local nighttime. In this study, tidal decomposition is applied to FORMOSAT-3 (Formosa Satellite)/Constellation Observing System for Meteorology, Ionosphere, and Climate (COSMIC) total electron content (TEC) and electron density observations between 2007 and 2012 to quantify the components dominating local time and spatial variation in the WSA region. Our results present some of the first three-dimensional spaceborne analyses of the WSA from a tidal perspective over multiple years. We find that the features of the WSA can be reconstructed as the result of superposition between the dominant diurnal standing (D0), eastward wave number 1 (DE1), westward wave number 2 (DW2), and stationary planetary wave 1 (SPW1) components in TECs, producing the characteristic midnight WSA peak. The D0, DE1, DW2, and SPW1 components are found to be an interannually recurring feature of the southern midlatitude to high-latitude ionosphere during the summer, manifesting as enhancements in electron density around 300 km altitude of the summer middle to high magnetic latitudes. The phases of the aforementioned nonmigrating diurnal signatures in electron density in this region are near evanescent, suggesting in situ generation, rather than upward propagation from below. However, the SPW1 signature shows some signs of an eastward tilt with altitude, suggesting possible downward propagation. The relation of these components to possible generation via in situ photoionization or plasma transport along magnetic field lines is also discussed using results from the Ground-to-topside model of Atmosphere and Ionosphere for Aeronomy (GAIA) general circulation model (GCM), connecting the tidal interpretation of the WSA to previously examined generation mechanisms.

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Ionospheric response to tidal waves measured by dynasonde techniques

et al. 2016

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Atmospheric tides are known to have a dramatic influence on thermospheric and ionospheric structure and variability. Considerable effort goes into understanding characteristics of tidal modes, their interactions with planetary and gravity waves and other tidal modes, as well as their influence on the background state of the thermosphere‐ionosphere system. For the altitude interval between roughly 120 and 400 km, this effort is somewhat hindered by the lack of global observations. We propose a new method of determining tidal variability by making use of dynasonde measurements. The NeXtYZ inversion procedure produces altitude profiles of the ionospheric parameters with a vertical resolution typically better than 1 km. This, together with the typical 2 min cadence of the instrument, results in extensive data sets with wide temporal and altitude coverage. At any given altitude we have nonuniform sampling due to the natural ionospheric variability. A Lomb‐Scargle implementation is used to obtain equivalent results at all altitudes and locations. We report height profiles of the first three tidal harmonics derived from dynasonde measurements. The data analyzed include the vertical electron density profiles, the ionospheric X (east‐west) “tilt” measurement, and the derived zonal plasma density gradient. Both the tilt and the gradient are shown to be sensitive tracers of atmospheric waves. We use data from Wallops Island and San Juan, for two time intervals: 6 May‐ 6 June and 9 October‐ 8 November 2013, thus capturing seasonal, latitudinal, and altitude variations of tidal amplitude and phase. This proves the potential of using dynasonde‐capable instruments as a data source for tidal studies in the thermosphere.

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Global ionospheric response to nonmigrating DE3 and DE2 tides forced from below

Cited by 35 publications

References 55 publications

A Statistical Comparison of Zonal Mean and Tidal Signatures in FORMOSAT-3/COSMIC and Ground-Based GPS TECs

A Statistical Comparison of Zonal Mean and Tidal Signatures in FORMOSAT-3/COSMIC and Ground-Based GPS TECs

Structure and origins of the Weddell Sea Anomaly from tidal and planetary wave signatures in FORMOSAT‐3/COSMIC observations and GAIA GCM simulations

Ionospheric response to tidal waves measured by dynasonde techniques

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