TY - JOUR

T1 - Reactions of the middle atmosphere circulation and stationary planetary waves on the solar activity effects in the thermosphere

AU - Koval, A.V.

AU - Gavrilov, N.M.

AU - Pogoreltsev, A.I.

AU - Shevchuk, N.O.

N1 - Koval, A. V., Gavrilov, N. M.,Pogoreltsev, A. I., & Shevchuk, N. O.(2019). Reactions of the middleatmosphere circulation and stationaryplanetary waves on the solar activityeffects in the thermosphere.Journal ofGeophysical Research: Space Physics,124. https://doi.org/10.1029/2019JA027392

PY - 2019/12/26

Y1 - 2019/12/26

N2 - Using numerical simulations of the general atmospheric circulation during boreal winter, statistically confident evidences are obtained for the first time, demonstrating that changes in the solar activity (SA) in the thermosphere at heights above 100 km can influence propagation and reflection conditions for stationary planetary waves (SPWs) and can modify the middle atmosphere circulation below 100 km. A numerical mechanistic model simulating atmospheric circulation and SPWs at heights 0–300 km is used. To achieve sufficient statistical confidence, 80 pairs of 15‐day intervals were extracted from an ensemble of 16 pairs of model runs corresponding to low and high SA. Results averaged over these intervals show that impacts of SA above 100 km change the mean zonal wind and temperature up to 10% at altitudes below 100 km. The statistically confident changes in SPW amplitudes due to SA impacts above 100 km reach up to 50% in the thermosphere and 10–15% in the middle atmosphere depending on zonal wavenumber. Changes in wave amplitudes correspond to variations of the Eliassen‐Palm flux and may alter dynamical and thermal SPW impacts on the mean wind and temperature. Thus, variable conditions of SPW propagation and reflection at thermospheric altitudes may influence the middle atmosphere circulation, thermal structure, and planetary waves.

AB - Using numerical simulations of the general atmospheric circulation during boreal winter, statistically confident evidences are obtained for the first time, demonstrating that changes in the solar activity (SA) in the thermosphere at heights above 100 km can influence propagation and reflection conditions for stationary planetary waves (SPWs) and can modify the middle atmosphere circulation below 100 km. A numerical mechanistic model simulating atmospheric circulation and SPWs at heights 0–300 km is used. To achieve sufficient statistical confidence, 80 pairs of 15‐day intervals were extracted from an ensemble of 16 pairs of model runs corresponding to low and high SA. Results averaged over these intervals show that impacts of SA above 100 km change the mean zonal wind and temperature up to 10% at altitudes below 100 km. The statistically confident changes in SPW amplitudes due to SA impacts above 100 km reach up to 50% in the thermosphere and 10–15% in the middle atmosphere depending on zonal wavenumber. Changes in wave amplitudes correspond to variations of the Eliassen‐Palm flux and may alter dynamical and thermal SPW impacts on the mean wind and temperature. Thus, variable conditions of SPW propagation and reflection at thermospheric altitudes may influence the middle atmosphere circulation, thermal structure, and planetary waves.

KW - Средняя атмосфера

KW - термосфера

KW - Циркуляция атмосферы

KW - планетарные волны

KW - Численное моделирование

KW - солнечная активность

KW - солнечно-земные связи

KW - Numerical simulation

KW - planetary waves

KW - Solar activity

KW - Atmospheric circulation

UR - https://onlinelibrary.wiley.com/doi/abs/10.1029/2019JA027392

U2 - 10.1029/2019JA027392

DO - 10.1029/2019JA027392

M3 - Article

VL - 124

JO - Journal of Geophysical Research: Biogeosciences

JF - Journal of Geophysical Research: Biogeosciences

SN - 0148-0227

ER -