Tidal effects on the thermosphere

Fesen, C. G.

doi:10.1007/bf02125771

Cited by 7 publications

(3 citation statements)

References 77 publications

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“…The thermosphere and ionosphere conditions are continuously affected by energy inputs from solar radiation [ Burns et al , 2004; Forbes et al , 2006], particle precipitation and Poynting fluxes from the magnetosphere [ Fuller‐Rowell et al , 1994], and waves from the lower atmosphere [ Fesen , 1992; Sharon et al , 2004]. In addition to the solar radiation and the magnetospheric energy inputs that are usually the dominant drivers, the large scale waves (such as tides) also play an important role, especially during solar minimum years where the high latitude energy inputs are comparably very weak and the magnitude of the eastward propagating diurnal tide with zonal wave number 3 (DE3) in the thermosphere maximizes [ Häusler et al , 2010].…”

Section: Introductionmentioning

confidence: 99%

Thermospheric composition variations due to nonmigrating tides and their effect on ionosphere

Zhang

England

Paxton

2010

Geophysical Research Letters

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[1] The TIMED/GUVI thermospheric composition (O/N 2 ratio) over 2009 reveals clear wave-3 (summer season) and wave-4 (Fall season) longitudinal dependence. The wave peak to valley varies from 7 to 11% of the background O/N 2 . The low Kp (yearly mean of 0.9) and low solar EUV flux indicates that the wave features were not caused by geomagnetic activity or solar EUV variation. A more likely explanation is nonmigrating diurnal eastward propagating DE2 and DE3 tides. Model calculations indicate that a 10% variation in O/N 2 makes 1/3 contribution to the nightside equatorial 135.6 nm intensities compared to the variation due to the E-region dynamo electric field. This study confirms that nonmigrating tides can penetrate toward the upper thermosphere, both O/N 2 and the E-region dynamo should be considered in analyzing ionospheric density variations due to nonmigrating tides. Comparison with MSIS results indicates that the nonmigrating tides have stronger effect on O/N 2 than the migrating tides. Citation: Zhang, Y., S. England, and L. J. Paxton (2010), Thermospheric composition variations due to nonmigrating tides and their effect on ionosphere, Geophys. Res. Lett.,

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Section: Introductionmentioning

confidence: 99%

Thermospheric composition variations due to nonmigrating tides and their effect on ionosphere

Zhang

England

Paxton

2010

Geophysical Research Letters

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“…The only restriction is the circumstance that the hydrostatic approximation is used, which is valid only for sufficiently long-period oscillations (with frequencies much lower than the Brunt-Väisälä frequency). The results obtained on the basis of this approach played an important role in the description of tidal modes and continue to be relevant until now (Forbes and Garrett, 1979;Fesen, 1995;Gavrilov, 1995;Grigor'ev, 1999;Akmaev, 2001;Angelatsi and Forbes, 2002;Yu at. al., 2009).…”

Section: Introductionmentioning

confidence: 68%

Waves in vertically inhomogeneous dissipative atmosphere

Dmitrienko,

Rudenko

2015

Preprint

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A method of construction of solution for acoustic-gravity waves (AGW) above a wave source, taking dissipation throughout the atmosphere into account (Dissipative Solution above Source, DSAS), is proposed. The method is to combine three solutions for three parts of the atmosphere: an analytical solution for the upper isothermal part and numerical solutions for the real non-isothermal dissipative atmosphere in the middle part and for the real non-isothermal small dissipation atmosphere in the lower one. In this paper the method has been carried out for the atmosphere with thermal conductivity but without viscosity. The heights of strong dissipation and the total absorption index in the regions of weak and average dissipation are found. For internal gravity waves the results of test calculations for an isothermal atmosphere and calculations for a real non-isothermal atmosphere are shown in graphical form. An algorithm and appropriate code to calculate DSAS, taking dissipation due to finite thermal conductivity into account throughout the atmosphere, are developed. The results of test DSAS calculations for an everywhere isothermal atmosphere are given. The calculation results for DSAS for the real non-isothermal atmosphere are also presented. A method for constructing of the 2x2 Green's matrix fully taking dissipation into account and allowing to find disturbance from some source of AGW in the atmosphere is proposed.

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“…Important tools for studying atmospheric tides (numerical models of the upper atmosphere and ionosphere) are currently being actively developed [12,13]. It should be noted that, for the most part, the theoretical studies of the dynamics of the upper atmosphere performed earlier in the conditions of geomagnetic disturbances drew attention to two main factors affecting the state of the thermosphere: Joule heating and ion drag.…”

Section: Introductionmentioning

confidence: 99%

Energetic Particle Precipitation Influence on Tidal Variations of Thermosphere Parameters in September 2017

et al. 2023

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The role of energetic particle precipitation in the formation of thermospheric tides is investigated. Using the Global Self-consistent Model of the Thermosphere, Ionosphere, and Protonosphere (GSM TIP) and two models of energetic particle precipitation, APM (Auroral Precipitation Model) and AIMOS 2.0.-AISstorm (Atmospheric Ionization Module Osnabrück 2.0—Atmospheric Ionization during Substorms), we performed simulations for the period 3–12 September 2017. This period covers both geomagnetically quiet days and the storm of 7–8 September. The analysis shows that migrating tides diurnal wave (DW) and semidiurnal wave (SW) prevail on quiet days for both versions of the simulations. On the day of maximum storm development on 8 September and the day after—9 September, the nonmigrating components of tidal waves, mainly DW0 and SW0, are intensified. There are also increasing differences in the spatial structure of tides between the two versions of simulations, especially between diurnal and semidiurnal tides at 154 km. On the disturbance days, the amplitudes of diurnal and semidiurnal tides at 154 km in the APM version are markedly greater than the corresponding values in the AIMOS version. Thus, it should be noted that the integral characteristics of the ionization function from precipitations are more important for the formation of DW and SW than its spatial structure or the features of temporal variations. A comparison of the total electron content (TEC) maps for the two versions of the simulation showed that the AIMOS version nicely reproduces the experimental data for a quiet time. The APM version is less accurate for quiet time but simulates the quantitative increase to disturbed conditions at high and middle latitudes better. For model reproduction of observed TEC variations at low and equatorial latitudes, it is not enough to consider the thermospheric source of thermospheric tides. In this case, the role of atmosphere–ionosphere coupling is very important.

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Tidal effects on the thermosphere

Cited by 7 publications

References 77 publications

Thermospheric composition variations due to nonmigrating tides and their effect on ionosphere

Thermospheric composition variations due to nonmigrating tides and their effect on ionosphere

Waves in vertically inhomogeneous dissipative atmosphere

Energetic Particle Precipitation Influence on Tidal Variations of Thermosphere Parameters in September 2017

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