CHAMP衛(wèi)星觀測(cè)的熱層大氣密度變化特征

doi:10.3969/2020jms.0025

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CHAMP衛(wèi)星觀測(cè)的熱層大氣密度變化特征
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                        10.3969/2020jms.0025
                    
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中圖分類號(hào):211101
基金項(xiàng)目:國(guó)家自然科學(xué)基金資助項(xiàng)目（41875045）

Features of the thermosphere density at 400 km derived from the CHAMP

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采用2001-2010年CHAMP（CHAllenging Minisatellite Payload）衛(wèi)星高精度加速度計(jì)反演的熱層大氣總質(zhì)量密度觀測(cè)數(shù)據(jù)，對(duì)400 km高度大氣密度的變化特征進(jìn)行了分析與研究。結(jié)果表明，太陽(yáng)輻射高低整體上控制著熱層大氣密度數(shù)值大小變化，在太陽(yáng)寧?kù)o期熱層大氣密度受地磁活動(dòng)控制，其最大值區(qū)域在地磁12-18時(shí)（地方時(shí)）內(nèi)移動(dòng)，重復(fù)周期為4~5個(gè)月，與地磁活動(dòng)的Ap指數(shù)變化相似。對(duì)比經(jīng)驗(yàn)?zāi)Ｊ脚cCHAMP衛(wèi)星觀測(cè)值，兩者偏差緯向分布較均勻，經(jīng)向變化明顯；當(dāng)太陽(yáng)活動(dòng)處于中低水平即F_10.7小于120時(shí)，模式值偏高5%~10%；當(dāng)F_10.7大于130時(shí)，模式值偏低10%以上。為經(jīng)驗(yàn)?zāi)Ｊ降母倪M(jìn)提供相應(yīng)的參考。

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Total mass densities at 400 km altitude derived from the CHAMP(Challenging Minisatellite Payload) satellite are used to characterize the distribution and monthly variance of thermosphere density. Thermospheric density is affected by the solar activity. During the solar minimum, the density is mainly determined by the geomagnetic activity, and the maximum moves from 12 to 18 periodically. The period is about 4 to 5 months, similar with that of the Ap index. Comparison between the CHAMP dataset and the NRLMSISE00 empirical model shows that:the density ratio bias varies with latitude. An underestimation occurs in the south of S, while an overestimation in the north. When the solar activity is quite, the model is greater than the CHAMP measurements by 5% to 10%. If F_10.7 is larger than 130, the model is smaller by 10%. Under the quiet and moderate geomagnetic activities conditions, an overestimation of 10% occurs for most of the MLT. The bias also exhibits monthly variation, which is positive in winter and spring and is negative in summer and autumn. The secular statistics provide a valuable reference to improve the empirical model.

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宋平,盛崢,費(fèi)建芳. CHAMP衛(wèi)星觀測(cè)的熱層大氣密度變化特征.氣象科學(xué),2020,40(6):761-768 SONG Ping, SHENG Zheng, FEI Jianfang. Features of the thermosphere density at 400 km derived from the CHAMP. Journal of the Meteorological Sciences,2020,40(6):761-768

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收稿日期:2020-03-16
最后修改日期:2020-04-07
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在線發(fā)布日期: 2021-01-12
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