Modeling Study on the Response of the Thermospheric Vertical Winds to Geomagnetic Storm at Middle Latitudes
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摘要: 基于TIMEGCM模型,研究了2005年9月10日中纬度地磁暴期间热层(100~650 km)水平风场变化对垂直风的影响。通过连续性方程诊断分析了暴时引起垂直风场变化的机制,结果表明:250 km以上的垂直风场取决于水平风场的变化,而250 km以下的垂直风场由较高高度的垂直风拉动;在地磁暴初相开始时,经向风场相比纬向风场对暴时250 km以上的垂直风场影响更为显著,随着地磁扰动增强,纬向风场对垂直风场变化的贡献更大;温度场对地磁暴的响应遵循同样规律,扰动开始时,温度沿经线传播更快,经向风变化更大,扰动增强后,温度沿纬线传播更快,纬向风变化更大。Abstract: Based on the simulation data of TIMEGCM, the influence of horizontal wind variations on middle-latitude vertical wind changes during the geomagnetic storms (100~650 km) on 10 September 2005 is studied. The model simulations were diagnostically analyzed, which is to investigate the causes of storm-time vertical wind changes. The results show that the vertical wind variations above 250 km depend on the changes of horizontal wind, and the vertical wind changes below 250 km are driven by the vertical wind at high altitudes. In the early initial phase of geomagnetic storms, the meridional winds have more significant influence on the vertical winds over 250 km than the zonal winds. As the storm evolves, the zonal winds contributed more to the changes of vertical wind. The responses of temperature variations to the geomagnetic storms are similar with horizontal wind changes. At the beginning of the initial phase, the temperature propagates faster along the longitude, and the meridional wind changes faster. As the storm evolves, the temperature propagates faster along the latitude, and the zonal wind changes faster.
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Key words:
- Geomagnetic storm /
- TIMEGCM model /
- Vertical wind /
- Horizontal wind
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图 2 中纬度地磁暴期间热层水平风场沿纬度压力面网格的变化(F)与垂直风场(向上为正,向下为负;黑色虚线表示250 km高度,黄色和绿色虚线分别代表06:00 UT和18:00 UT时刻)
Figure 2. Variation of horizontal wind along the grid of longitude (F) and vertical wind in the thermosphere during mid-latitude geomagnetic storms (Up is positive, down is negative; the black dotted line indicates 250 km height, and the yellow and green dashed lines indicate 06:00 UT and 18:00 UT respectively)
图 5 中纬度地磁暴期间高热层纬向风场、经向风场与水平风场的散度暴时变化(向东和向北为正,向西和向南为负;黄色虚线和绿色虚线分别注明了06:00 UT和18:00 UT)
Figure 5. Divergence velocity changes of the zonal wind, meridional wind and horizontal wind during geomagnetic storm in the middle latitude (the east is positive and the west is negative; the yellow dotted line and the green dotted lines indicate 06:00 UT and 18:00 UT respectively)
图 6 中纬度地磁暴期间热层纬向风场和温度场沿纬线的差值与纬向风场(向东为正,向西为负;黄色和绿色虚线分别表示06:00 UT和18:00 UT时刻)
Figure 6. Difference between the zonal wind and temperature along the latitude line and the zonal wind during geomagnetic storm in the middle latitude (The east is positive, the west is negative, and the yellow and the green dotted lines indicate 06:00 UT and 18:00 UT respectively)
图 7 中纬度地磁暴期间热层温度场和经向风场沿经线的差值与经向风场(向东为正,向西为负,黑色虚线标注的是250 km,黄色和绿色虚线分别表示06:00 UT和18:00 UT时刻)
Figure 7. Difference between the temperature of the hyperthermia and the meridional wind along the meridian during the mid-latitude geomagnetic storm and the meridional wind (North is positive, south is negative, and the yellow and the green dotted lines indicate 06:00 UT and 18:00 UT respectively)
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[1] LIU Libo, WAN Weixing. A brief overview on the issue on space physics and space weather[J]. Chinese Journal of Geophysics, 2014, 57(11): 3493-3501 doi: 10.6038/cjg20141101 [2] DICKINSON R E, GEISLER J E. Vertical motion field in the middle thermosphere from satellite drag densities[J]. Monthly Weather Review, 1968, 96(9): 606-616 doi: 10.1175/1520-0493(1968)096<0606:VMFITM>2.0.CO;2 [3] RISHBETH H, MOFFETT R J, BAILEY G J. Continuity of air motion in the mid-latitude thermosphere[J]. Journal of Atmospheric and Terrestrial Physics, 1969, 31(8): 1035-1047 doi: 10.1016/0021-9169(69)90103-2 [4] BURNSIDE R G, HERRERO F A, MERIWETHER JR J W, et al. Optical observations of thermospheric dynamics at Arecibo[J]. Journal of Geophysical Research, 1981, 86(A7): 5532-5540 doi: 10.1029/ja086ia07p05532 [5] HERNANDEZ G. Vertical motions of the neutral thermosphere at midlatitude[J]. Geophysical Research Letters, 1982, 9(5): 555-557 doi: 10.1029/gl009i005p00555 [6] SPENCER N W, THEIS R F, WHARTON L E, et al. Local vertical motions and kinetic temperature from AE-C as evidence for aurora-induced gravity waves[J]. Geophysical Research Letters, 1976, 3(6): 313-316 doi: 10.1029/gl003i006p00313 [7] HARDING B J, MAKELA J J, QIN J Q, et al. Atmospheric scattering effects on ground-based measurements of thermospheric vertical wind, horizontal wind, and temperature[J]. Journal of Geophysical Research, 2017, 122(7): 7654-7669 doi: 10.1002/2017ja023942 [8] HU Guoyuan, AI Yong, ZHANG Yange, et al. A method for vertical neutral wind in the thermosphere deduced from all-sky FPI measurements[J]. Chinese Journal of Geophysics, 2014, 57(11): 3695-3702 doi: 10.6038/cjg20141124 [9] ZHANG S R, ERICKSON P J, FOSTER J C, et al. Thermospheric poleward wind surge at midlatitudes during great storm intervals[J]. Geophysical Research Letters, 2015, 42(13): 5132-5140 doi: 10.1002/2015GL064836 [10] ZHANG R L, LIU L B, LE H J, et al. Equatorial ionospheric electrodynamics over Jicamarca during the 6-11 September 2017 space weather event[J]. Journal of Geophysical Research, 2019, 124(2): 1292-1306 doi: 10.1029/2018JA026295 [11] BIONDI M A. Measured vertical motion and converging and diverging horizontal flow of the midlatitude thermosphere[J]. Geophysical Research Letters, 1984, 11(1): 84-87 doi: 10.1029/gl011i001p00084 [12] REES D, SMITH R W, CHARLETON P J, et al. The generation of vertical thermospheric winds and gravity waves at auroral latitudes—I. Observations of vertical winds[J]. Planetary and Space Science, 1984, 32(6): 667 doi: 10.1016/0032-0633(84)90092-8 [13] PETEHERYCH S, SHEPHERD G G, WALKER J K. Observation of vertical E-region neutral winds in two intense auroral arcs[J]. Planetary and Space Science, 1985, 33(8): 869-873 doi: 10.1016/0032-0633(85)90101-1 [14] SMITH R W, HERNANDEZ G. Vertical winds in the thermosphere within the polar cap[J]. Journal of Atmospheric and Terrestrial Physics, 1995, 57(6): 611-620 doi: 10.1016/0021-9169(94)00101-s [15] LI J Y, WANG W B, LU J Y, et al. On the responses of mesosphere and lower thermosphere temperatures to geomagnetic storms at low and middle latitudes[J]. Geophysical Research Letters, 2018, 45(19): 10128-10137 doi: 10.1029/2018gl078968 [16] LI J Y, WANG W B, LU J Y, et al. A modeling study of the responses of mesosphere and lower thermosphere winds to geomagnetic storms at middle latitudes[J]. Journal of Geophysical Research, 2019, 124(5): 3666-3680 doi: 10.1029/2019ja026533 [17] RICHMOND A D, RIDLEY E C, ROBLE R G. A thermosphere/ionosphere general circulation model with coupled electrodynamics[J]. Geophysical Research Letters, 1992, 19(6): 601-604 doi: 10.1029/92GL00401 [18] RICHMOND A D. Ionospheric electrodynamics[M]//VOLLAND H. Handbook of Atmospheric Electrodynamics. Boca Raton: CRC Press, 1995: 249-290 [19] ROBLE R G, RIDLEY E C. An auroral model for the NCAR thermospheric general circulation model (TGCM)[J]. Annales Geophysicae Series A-upper Atmosphere and Space Sciences, 1987, 5(6): 369-382 [20] ROBLE R G, RIDLEY E C. A thermosphere-ionosphere-mesosphere-electrodynamics general circulation model (time-GCM): equinox solar cycle minimum simulations (30-500 km)[J]. Geophysical Research Letters, 1994, 21(6): 417-420 doi: 10.1029/93gl03391 [21] ROBLE R G. Energetics of the mesosphere and thermosphere[M]//JOHNSON R M, KILLEEN T L. The Upper Mesosphere and Lower Thermosphere: A review of Experiment and Theory. Washington: American Geophysical Union, 1995: 1-21 [22] ROBLE R G. The NCAR thermosphere-ionosphere-mesosphere-electrodynamics general circulation model (TIME-GCM)[M]//SCHUNK R W. Solar-Terrestrial Energy Program: Handbook of Ionospheric Models. Logan: Utah State University, 1996: 281-288 [23] HEELIS R A, LOWELL J K, SPIRO R W. A model of the high-latitude ionospheric convection pattern[J]. Journal of Geophysical Research, 1982, 87(A8): 6339-6345 doi: 10.1029/JA087iA08p06339 [24] KLIMENKO M V, KLIMENKO V V, RATOVSKY K G, et al. Ionospheric effects caused by the series of geomagnetic storms of September 9-14, 2005[J]. Geomagnetism and Aeronomy, 2011, 51(3): 364-376 doi: 10.1134/s0016793211030108