Thermospheric tidal effects on the ionospheric midlatitude summer nighttime anomaly using SAMI3 and TIEGCM

Chen, C. H.; Lin, Chien Hung; Chang, Loren C.; Huba, J. D.; Lin, Jeng-Feng; Saito, Akinori; Liu, J. Y.

doi:10.1002/jgra.50340

Cited by 35 publications

(54 citation statements)

References 55 publications

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“…At ionosphere mid-latitudes, the nighttime electron density enhancement has been observed and reported by previous studies (e.g., Bailey et al 1991;Farelo et al 2002;Dabas and Kersley 2003;Luan et al 2008;Park et al 2008;Chen et al 2011Chen et al , 2012Chen et al , 2013Lin et al 2011;Rajesh et al 2016). This density-enhanced ionospheric feature appeared more frequently during solar minimum conditions (Bailey et al 1991), and it is suggested to be caused by larger downward plasma flux from the plasmasphere during the nighttime (Mikhailov et al 2000;Farelo et al 2002;Dabas and Kersley 2003).…”

Section: Introductionsupporting

confidence: 74%

The impact of FORMOSAT-5/AIP observations on the ionospheric space weather

Chen

Lin

Liu

et al. 2017

Terr. Atmos. Ocean. Sci.

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This paper assimilates the in-situ O + fluxes observations obtained from the Advanced Ionospheric Probe (AIP) onboard the upcoming FORMOSAT-5 (FS-5) satellite and evaluates its possible impact on the ionospheric space weather forecast model. The Observing System Simulation Experiment (OSSE), designed for the global O + fluxes, is shown to improve the electron density specification in the vicinity of satellite orbits. The root-mean-square-error (RMSE) of the ionospheric electron density obtained from assimilating the daytime O + fluxes could be improved by ~10 and ~5% for the forecast and nowcast, respectively. Although the improvement of nighttime O + flux assimilation is less significant compared to the daytime assimilation, it still reveals impacts on the model result. This suggests that nighttime observations might not be sufficient to alter the model trajectory in the positive direction as with the daytime result. Alternative data assimilation approaches, such as assimilation of the empirical model built by using the nighttime FS-5/AIP together with other existing satellite observations of O + flux could obtain better accuracy of the electron density forecast.

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Section: Introductionsupporting

confidence: 74%

The impact of FORMOSAT-5/AIP observations on the ionospheric space weather

Chen

Lin

Liu

et al. 2017

Terr. Atmos. Ocean. Sci.

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“…As the E × B drift mainly affects the F region at equatorial latitudes, it will not be important for the longitudinal wave patterns of the plasma at midlatitudes. However, the wave patterns of the MSNA as reported by Chen et al (2013) and Xiong and Lühr (2014) imply that there should be some other coupling mechanism at midlatitudes. By model simulations, Jones Jr. et al (2013) revealed that at low and middle latitudes the nonmigrating tides of the zonal wind could be generated in situ through ion-neutral interactions due to the longitudinal ionospheric density variations imposed by the actual geomagnetic field configuration.…”

Section: Zonal Wind Observations and Model Predictionsmentioning

confidence: 89%

“…Other mechanisms such as the transportation of plasma from the dayside ionosphere and the downward flux from the plasmasphere have also been proposed (Burns et al, 2008). By employing a three-dimensional physics-based ionosphere model, SAMI3 (Sami3 is Also a Model of the Ionosphere), coupled with the Thermosphere-Ionosphere Electrodynamics General Circulation Model (TIE-GCM) and the Global Scale Wave Model, Chen et al (2013) reported a clear eastward movement of the southern MSNA (see their Fig. 2b).…”

Section: Introductionmentioning

confidence: 97%

Tidal signatures of the thermospheric mass density and zonal wind at midlatitude: CHAMP and GRACE observations

et al. 2015

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Abstract. By using the accelerometer measurements from CHAMP and GRACE satellites, the tidal signatures of the thermospheric mass density and zonal wind at midlatitudes have been analyzed in this study. The results show that the mass density and zonal wind at southern midlatitudes are dominated by a longitudinal wave-1 pattern. The most prominent tidal components in mass density and zonal wind are the diurnal tides D0 and DW2 and the semidiurnal tides SW1 and SW3. This is consistent with the tidal signatures in the F region electron density at midlatitudes as reported by Xiong and Lühr (2014). These same tidal components are observed both in the thermospheric and ionospheric quantities, supporting a mechanism that the non-migrating tides in the upper atmosphere are excited in situ by ion-neutral interactions at midlatitudes, consistent with the modeling results of Jones Jr. et al. (2013). We regard the thermospheric dynamics as the main driver for the electron density tidal structures. An example is the in-phase variation of D0 between electron density and mass density in both hemispheres. Further research including coupled atmospheric models is probably needed for explaining the similarities and differences between thermospheric and ionospheric tidal signals at midlatitudes.

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“…Wu et al, 2012). At middle latitude Chen et al (2013) reported an eastward propagating wave 1 pattern of the Weddell Sea Anomaly (WSA) by using the SAMI3 (Sami3 is Also a Model of the Ionosphere) model combined with the Thermosphere-Ionosphere Electrodynamics General Circulation Model (TIEGCM) and the Global-Scale Wave model simulations. Based on the in situ electron density measurements from CHAMP and GRACE satellites, found a prominent longitudinal WN2 pattern in the northern middle latitudes during local summer.…”

Section: Y-l Zhou Et Al: Solar Activity Dependence Of Nonmigratingmentioning

confidence: 99%

The solar activity dependence of nonmigrating tides in electron density at low and middle latitudes observed by CHAMP and GRACE

et al. 2016

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Abstract. In this paper we use more than a decade of in situ electron density observations from CHAMP and GRACE satellites to investigate the solar activity dependence of nonmigrating tides at both low and middle latitudes. The results indicate that the longitudinal patterns of F region electron density vary with season and latitude, which are exhibiting a wavenumber 4 (WN4) pattern around September equinox at low latitudes and WN1/WN2 patterns during local summer at the southern/northern middle latitudes. These wave patterns in the F region ionosphere can clearly be seen during both solar maximum and minimum years. At low latitudes the absolute amplitudes of DE3 (contributing to the WN4 pattern) are found to be highly related to the solar activity, showing larger amplitudes during solar maximum years. Similarly a solar activity dependence can also be found for the absolute amplitudes of D0, DW2 and DE1 (contributing to the WN1 and WN2 pattern) at middle latitudes. The relative amplitudes (normalized by the zonal mean) of these nonmigrating tides at both low and middle altitudes show little dependence on solar activity. We further found a clear modulation by the quasi-biennial oscillation (QBO) of the relative DE3 amplitudes in both satellite observations, which is consistent with the QBO dependence as reported for the E region temperatures and zonal wind. It also supports the strong coupling of the low-latitude nonmigrating tidal activity between the E and F regions. However, the QBO dependence cannot be found for the relative amplitudes of the nonmigrating tides at middle latitudes, which implies that these tides are generated in situ at F region altitudes.

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Thermospheric tidal effects on the ionospheric midlatitude summer nighttime anomaly using SAMI3 and TIEGCM

Cited by 35 publications

References 55 publications

The impact of FORMOSAT-5/AIP observations on the ionospheric space weather

The impact of FORMOSAT-5/AIP observations on the ionospheric space weather

Tidal signatures of the thermospheric mass density and zonal wind at midlatitude: CHAMP and GRACE observations

The solar activity dependence of nonmigrating tides in electron density at low and middle latitudes observed by CHAMP and GRACE

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