基于范阿倫衛(wèi)星觀測數(shù)據(jù)的等離子體層嘶聲全球分布的統(tǒng)計(jì)分析
發(fā)布時(shí)間：2019-01-13 07:28
【摘要】：等離子體層嘶聲是引起輻射帶電子投擲角散射進(jìn)而沉降到地球大氣層的重要物理機(jī)理,也被認(rèn)為是導(dǎo)致地球內(nèi)、外輻射帶之間槽區(qū)形成的主因,因此研究空間等離子體層嘶聲的全球分布特性具有重要科學(xué)意義.本文利用范阿倫探測雙星中的A星從2012年9月到2015年5月長達(dá)33個(gè)月的高質(zhì)量波動觀測數(shù)據(jù),詳細(xì)計(jì)算了等離子體層嘶聲的平均波幅和發(fā)生率,建立了等離子體層嘶聲的全球分布數(shù)據(jù)庫,并細(xì)致分析了其場強(qiáng)幅度隨地磁活動水平、磁殼值L、地磁緯度、磁地方時(shí)的統(tǒng)計(jì)變化規(guī)律.結(jié)果表明,等離子體層嘶聲的平均波幅與地磁活動劇烈程度具有很強(qiáng)的相關(guān)性,并表現(xiàn)出明顯的晝夜不對稱性.隨著地磁活動的增強(qiáng),日側(cè)等離子體層嘶聲的平均波幅相應(yīng)增大,增強(qiáng)的區(qū)域集中在2.5L4,但是夜側(cè)等離子體層嘶聲的平均波幅反而下降.另外,不同幅度的等離子體層嘶聲隨地磁活動的變化表現(xiàn)出不同的響應(yīng)特性.隨著地磁活動水平的增強(qiáng),較小幅度(5—30 pT)的等離子體層嘶聲的日側(cè)發(fā)生率減小,夜側(cè)發(fā)生率增大;更強(qiáng)幅度(30 pT)的等離子體層嘶聲的變化特性正好相反,日側(cè)發(fā)生率增大,夜側(cè)發(fā)生率減小.在各種地磁活動條件下,磁赤道面附近及中緯地區(qū)等離子體層嘶聲都廣泛存在,波動幅度位于5—30 pT范圍的嘶聲發(fā)生概率最大.以上統(tǒng)計(jì)觀測結(jié)果為現(xiàn)有的等離子體層嘶聲全球分布模型提供了合理、可靠的補(bǔ)充,充分說明不同場強(qiáng)幅度的等離子體層嘶聲在2L6的內(nèi)磁層空間經(jīng)常性地存在,為定量分析、模擬不同能量、不同投擲角的地球輻射帶電子在不同太陽風(fēng)與磁層背景條件下的動態(tài)時(shí)空變化過程提供了重要參數(shù)支持.
[Abstract]:The hoarseness of the plasma layer is an important physical mechanism that causes the scattering of electrons from the radiation band into the earth's atmosphere, and is also considered to be the main cause of the formation of the trough region between the outer and outer radiation bands in the earth. Therefore, it is of great scientific significance to study the global distribution of hoarseness in space plasma layer. In this paper, the mean amplitude and incidence of hoarseness in plasma layer are calculated in detail by using the observation data of high quality wave from September 2012 to May 2015, which are 33 months from September 2012 to May 2015. The global distribution database of hoarseness sound in plasma layer is established, and the statistical variation of field intensity with geomagnetic activity level, magnetic shell value L, geomagnetic latitude and local magnetic time is analyzed in detail. The results show that the average amplitude of hoarseness in the plasma layer is strongly correlated with the intensity of geomagnetic activity and shows obvious diurnal asymmetry. With the increase of geomagnetic activity, the average amplitude of the hoarseness of the plasma layer on the day side increases accordingly, and the enhancement region is concentrated at 2.5L4, but the average amplitude of the hoarseness sound in the plasma layer decreases at night. In addition, the plasma layer hoarseness with different amplitude shows different response characteristics with geomagnetic activity. With the increase of geomagnetic activity, the incidence of sizzling in plasma layer decreased in a small amplitude (5-30 pT), and the incidence of nocturnal side increased. The variation of plasma layer hoarseness with a stronger amplitude (30 pT) is just the opposite. The incidence of the day side increases and the night side rate decreases. Under various geomagnetic conditions, hoarseness in plasma layer is widespread in the vicinity of the magnetic equator and in the middle latitude region, and the probability of hoarseness occurring in the range of 5-30 pT is the highest. The above statistical observations provide a reasonable and reliable supplement to the existing global distribution model of hoarseness sound in plasma layer. It fully shows that the hoarseness sound of plasma layer with different field intensities frequently exists in the inner magnetosphere of 2L6, which is a quantitative analysis. The simulation of the dynamic spatiotemporal variation of electrons in different solar wind and magnetosphere with different energy and different throwing angles provides important parameters for the simulation.
【作者單位】： 武漢大學(xué)電子信息學(xué)院空間物理系;
【基金】：國家自然科學(xué)基金(批準(zhǔn)號:41204120,41304130,41474141,41574160) 中國博士后科學(xué)基金(批準(zhǔn)號:2013M542041,2014T70732,2015M582265) 國家級大學(xué)生創(chuàng)新創(chuàng)業(yè)項(xiàng)目(批準(zhǔn)號:201510486081)資助的課題~~
【分類號】：O422.8
[Abstract]:The hoarseness of the plasma layer is an important physical mechanism that causes the scattering of electrons from the radiation band into the earth's atmosphere, and is also considered to be the main cause of the formation of the trough region between the outer and outer radiation bands in the earth. Therefore, it is of great scientific significance to study the global distribution of hoarseness in space plasma layer. In this paper, the mean amplitude and incidence of hoarseness in plasma layer are calculated in detail by using the observation data of high quality wave from September 2012 to May 2015, which are 33 months from September 2012 to May 2015. The global distribution database of hoarseness sound in plasma layer is established, and the statistical variation of field intensity with geomagnetic activity level, magnetic shell value L, geomagnetic latitude and local magnetic time is analyzed in detail. The results show that the average amplitude of hoarseness in the plasma layer is strongly correlated with the intensity of geomagnetic activity and shows obvious diurnal asymmetry. With the increase of geomagnetic activity, the average amplitude of the hoarseness of the plasma layer on the day side increases accordingly, and the enhancement region is concentrated at 2.5L4, but the average amplitude of the hoarseness sound in the plasma layer decreases at night. In addition, the plasma layer hoarseness with different amplitude shows different response characteristics with geomagnetic activity. With the increase of geomagnetic activity, the incidence of sizzling in plasma layer decreased in a small amplitude (5-30 pT), and the incidence of nocturnal side increased. The variation of plasma layer hoarseness with a stronger amplitude (30 pT) is just the opposite. The incidence of the day side increases and the night side rate decreases. Under various geomagnetic conditions, hoarseness in plasma layer is widespread in the vicinity of the magnetic equator and in the middle latitude region, and the probability of hoarseness occurring in the range of 5-30 pT is the highest. The above statistical observations provide a reasonable and reliable supplement to the existing global distribution model of hoarseness sound in plasma layer. It fully shows that the hoarseness sound of plasma layer with different field intensities frequently exists in the inner magnetosphere of 2L6, which is a quantitative analysis. The simulation of the dynamic spatiotemporal variation of electrons in different solar wind and magnetosphere with different energy and different throwing angles provides important parameters for the simulation.
【作者單位】： 武漢大學(xué)電子信息學(xué)院空間物理系;
【基金】：國家自然科學(xué)基金(批準(zhǔn)號:41204120,41304130,41474141,41574160) 中國博士后科學(xué)基金(批準(zhǔn)號:2013M542041,2014T70732,2015M582265) 國家級大學(xué)生創(chuàng)新創(chuàng)業(yè)項(xiàng)目(批準(zhǔn)號:201510486081)資助的課題~~
【分類號】：O422.8
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