太阳活动中低年厦门电离层扩展F发生率研究
|
摘要
本文利用2008年至2013年厦门电离层垂测仪的观测数据,分析了太阳活动中低年厦门电离层扩展F发生率的日变化、季节变化特征和太阳活动对厦门电离层扩展F发生率的影响,结果显示:(1)厦门电离层扩展F主要出现在地方时18时至次日8时的时间段内,扩展F发生率最大值出现在午夜后;(2)厦门电离层扩展F主要出现在5—8月的夏季月份,扩展F发生率最大值一般出现在6月份(2009年出现在5月份);(3)厦门电离层扩展F发生率的日变化、季节变化中存在明显的逐年变化;(4)厦门电离层扩展F年出现次数与太阳10.7 cm射电流量年平均值在2008年到2011年正向相关,而在2012年、2013年却负向相关;在每一年中(除了2012年外),厦门电离层扩展F月发生率与太阳10.7 cm射电流量月平均值负向相关.太阳活动和厦门电离层扩展F发生率之间的复杂关系表明,太阳活动可能通过赤道电离层扩展F和中纬电离层扩展F两种机制影响了厦门电离层扩展F发生.
Used data from Xiamen ionosonde from 2008 to 2013, the diurnal, seasonal varies of spread F Occurrence over Xiamen and the effect of solar activity on spread F occurrence over Xiamen in low and middle solar cycle are analyzed in this paper. The results are as following:(1) Spread-F over Xiamen mainly occurs during 18 LT to 8 LT, and the spread-F occurrence over Xiamen peaks after midnight;(2) Spread-F over Xiamen mainly appears summer months(from May to August), and the maximum of spread-F occurrence is in June generally;(3) There is obviously year by year varies in diurnal, seasonal varies of spread F occurrence over Xiamen;(4) The total number of spread-F over Xiamen correlates positively with the yearly average of Solar 10.7 cm radio flux from 2008 to 2011, while correlates negatively from 2012 to 2013; the monthly average of spread-F occurrence over Xiamen correlates negatively with the monthly average of Solar 10.7 cm radio flux in a year except 2012. The complex relationship between solar activity and spread-F occurrence over Xiamen shows that solar activity maybe influence spread-F occurrence over Xiamen by equatorial spread-F and mid-latitude spread-F mechanisms.
Used data from Xiamen ionosonde from 2008 to 2013, the diurnal, seasonal varies of spread F Occurrence over Xiamen and the effect of solar activity on spread F occurrence over Xiamen in low and middle solar cycle are analyzed in this paper. The results are as following:(1) Spread-F over Xiamen mainly occurs during 18 LT to 8 LT, and the spread-F occurrence over Xiamen peaks after midnight;(2) Spread-F over Xiamen mainly appears summer months(from May to August), and the maximum of spread-F occurrence is in June generally;(3) There is obviously year by year varies in diurnal, seasonal varies of spread F occurrence over Xiamen;(4) The total number of spread-F over Xiamen correlates positively with the yearly average of Solar 10.7 cm radio flux from 2008 to 2011, while correlates negatively from 2012 to 2013; the monthly average of spread-F occurrence over Xiamen correlates negatively with the monthly average of Solar 10.7 cm radio flux in a year except 2012. The complex relationship between solar activity and spread-F occurrence over Xiamen shows that solar activity maybe influence spread-F occurrence over Xiamen by equatorial spread-F and mid-latitude spread-F mechanisms.
引文
Abdu M A,Brum C G M.2009.Electrodynamics of the vertical coupling processes in the atmosphere-ionosphere system of the low latitude region [J].Earth,Planets and Space,61(4):385-395.
Abdu M A,Sobral J H A,Batista I S,et al.1998.Equatorial spread-F occurrence statistics in the American longitudes:Diurnal,seasonal and solar cycle variations[J].Adv.Space Res.,22(6):851-854.
Abdu M A,Sobral J H A,Batista I S.2000.Equatorial spread F statistics in the American longitudes:Some problems relevant to ESF description in the IRI scheme [J].Adv.Space Res.,25(l):113-124.
Abdu M A,SouzaI J R,Batista I S,et al.2003.Equatorial spread F statistics and empirical representation for IRI:A regional model for the Brazilian longitude sector[J].Adv.Space Res.,31(3):703-716.
Booker H G,Wells H W.1938.Scattering of radio waves by the F region of the ionosphere[J].Terr.Mag.Atmos.Electr,43(3):249-256.
Bowman G G.1992.Upper atmosphere neutral-particle density variations compared with spread-F occurrence rates at locations around the world [J].Ann.Geophys.,10(9):676- 682.
Chandra H,Sharma Som,Abdu M A,et al.2003.Spread-F at anomaly crest regions in the Indian and American longitudes [J].Advances in Space Research,31(3):717-727.
Hoang T L,Abdu M A,MacDougall J,et al.2010.Longitudinal differences in the equatorial spread F characteristics between Vietnam and Brazil[J].Advances in Space Research,45(3):351-360.
Igarashi K,Kato H.1993.Solar cycle variations and latitudinal dependence on the mid-latitude spread-F occurrence around Japan [J].Paper presented at the XXIV General Assembly,Int.Union of Radio Sci.,Kyoto,Japan.
Kelley M C,Swartz W E,Makela J J.2004.Mid-latitude ionospheric fluctuation spectra due to secondary E×B instabilities [J].J.Atmos.Sol.Terr.Phys.,66(17):1559-1565.
Lyon A J,Skinner N J,Wright R W H.1960.The belt of equatorial spread-F [J].Journal of Atmospheric and Terrestrial Physics,19(3- 4):145-159.
Wakai N,Ohyama H,Koizumi T.1987.Manual of ionogram scaling(3rd version),radio research laboratory ministry of posts and telecommunications,Japan,119pp.
Xiao Zuo,Zhang Tianhua.2001.Theoretical analysis of global distribution characteristics of spread-F [J].Chinese Science Bulletin (in Chinese),46(7):597-599.
Yu T,Wang Y G,Wang J S,et al.2010.Construction of an ionosonde station in Xiamen and preliminary observations [J].Progress in Geophys (in Chinese),25(2):538-542,doi:10.3969/j.issn.1004-2903.2010.02.022.
Zhang Tianhua,Xiao Zuo.2001.Model of spread F longitudinal Effect [J].Acta Scientiarum Naturalium Universitatis Pekinensis (in Chinese),37(3):348-352.
肖佐,张天华.2001.扩展F全球分布特点的理论分析[J].科学通报,46(7):597-599.
余涛,王云冈,王劲松,等.2010.厦门电离层垂测站建设及初步结果[J].地球物理学进展,25(2):538-542,doi:10.3969/j.issn.1004-2903.2010.02.022.
张天华,肖佐.2001.Spread-F的经度效应[J].北京大学学报(自然科学版),37(3):348-352.
Abdu M A,Sobral J H A,Batista I S,et al.1998.Equatorial spread-F occurrence statistics in the American longitudes:Diurnal,seasonal and solar cycle variations[J].Adv.Space Res.,22(6):851-854.
Abdu M A,Sobral J H A,Batista I S.2000.Equatorial spread F statistics in the American longitudes:Some problems relevant to ESF description in the IRI scheme [J].Adv.Space Res.,25(l):113-124.
Abdu M A,SouzaI J R,Batista I S,et al.2003.Equatorial spread F statistics and empirical representation for IRI:A regional model for the Brazilian longitude sector[J].Adv.Space Res.,31(3):703-716.
Booker H G,Wells H W.1938.Scattering of radio waves by the F region of the ionosphere[J].Terr.Mag.Atmos.Electr,43(3):249-256.
Bowman G G.1992.Upper atmosphere neutral-particle density variations compared with spread-F occurrence rates at locations around the world [J].Ann.Geophys.,10(9):676- 682.
Chandra H,Sharma Som,Abdu M A,et al.2003.Spread-F at anomaly crest regions in the Indian and American longitudes [J].Advances in Space Research,31(3):717-727.
Hoang T L,Abdu M A,MacDougall J,et al.2010.Longitudinal differences in the equatorial spread F characteristics between Vietnam and Brazil[J].Advances in Space Research,45(3):351-360.
Igarashi K,Kato H.1993.Solar cycle variations and latitudinal dependence on the mid-latitude spread-F occurrence around Japan [J].Paper presented at the XXIV General Assembly,Int.Union of Radio Sci.,Kyoto,Japan.
Kelley M C,Swartz W E,Makela J J.2004.Mid-latitude ionospheric fluctuation spectra due to secondary E×B instabilities [J].J.Atmos.Sol.Terr.Phys.,66(17):1559-1565.
Lyon A J,Skinner N J,Wright R W H.1960.The belt of equatorial spread-F [J].Journal of Atmospheric and Terrestrial Physics,19(3- 4):145-159.
Wakai N,Ohyama H,Koizumi T.1987.Manual of ionogram scaling(3rd version),radio research laboratory ministry of posts and telecommunications,Japan,119pp.
Xiao Zuo,Zhang Tianhua.2001.Theoretical analysis of global distribution characteristics of spread-F [J].Chinese Science Bulletin (in Chinese),46(7):597-599.
Yu T,Wang Y G,Wang J S,et al.2010.Construction of an ionosonde station in Xiamen and preliminary observations [J].Progress in Geophys (in Chinese),25(2):538-542,doi:10.3969/j.issn.1004-2903.2010.02.022.
Zhang Tianhua,Xiao Zuo.2001.Model of spread F longitudinal Effect [J].Acta Scientiarum Naturalium Universitatis Pekinensis (in Chinese),37(3):348-352.
肖佐,张天华.2001.扩展F全球分布特点的理论分析[J].科学通报,46(7):597-599.
余涛,王云冈,王劲松,等.2010.厦门电离层垂测站建设及初步结果[J].地球物理学进展,25(2):538-542,doi:10.3969/j.issn.1004-2903.2010.02.022.
张天华,肖佐.2001.Spread-F的经度效应[J].北京大学学报(自然科学版),37(3):348-352.