IJBTT

An Analytical Study of Nighttime Enhancement in foF2 during 23rd& 24th Solar Cycle at Low Latitude Station

	International Journal of Engineering Trends and Technology (IJETT)
	© 2018 by IJETT Journal
	Volume-61 Number-1
	Year of Publication : 2018
	Authors : Anita Agrawal, Kalpana Maski, S.K Vijay, S.D Mishra
	DOI :  10.14445/22315381/IJETT-V61P205

Citation 

MLA Style: Anita Agrawal, Kalpana Maski, S.K Vijay, S.D Mishra"An Analytical Study of Nighttime Enhancement in foF2 during 23rd& 24th Solar Cycle at Low Latitude Station" International Journal of Engineering Trends and Technology 61.1 (2018): 25-30.

APA Style:Anita Agrawal, Kalpana Maski, S.K Vijay, S.D Mishra, (2018). An Analytical Study of Nighttime Enhancement in foF2 during 23rd& 24th Solar Cycle at Low Latitude StationInternational Journal of Engineering Trends and Technology, 61(1), 25-30.

Abstract
This paper presents nighttime enhancement in foF2 during 23rd & 24th high solar activity periodat low latitude station Jicamarca (12oS, 76.90oW). To examine the nighttime enhancement of ionosphere, we have used the ionosonde measurements for critical frequency of F2 layer. The foF2 is an important and most widely used parameter for studying the ionosphere weather. Hourly data for the year 2002 (High solar activity period for 23rd solar cycle) & 2014 (High solar activity period for 24th solar cycle) of foF2 are analyzed to study the Hourly data for the year 2002 (High solar activity period for 23rd solar cycle) & 2014 (High solar activity period for 24th solar cycle) of foF2 are analyzed to study the anomalous nighttime F-region. To examine the seasonal effects, we grouped all data into three seasons’ winter, summer and equinox using the four months of data for each season equinox (March .April, September andOctober), winter (January, February, November and December) and summer (May, June, July and August). The enhancements are expressed pre-midnight enhancement and post-midnight enhancement, according to the local time when the enhancement appeared. In 2002 out of 149 enhancements in foF2, 127 enhancements occurred during pre-midnight hours and 22 during post–midnight hours, where as in 2014 Out of 94 enhancements in foF2 91ocurred during pre-mid night hours and 03 during post- midnight hours

Reference
[1] Arendt, P.R., and H. Soicher (1964) Downward electron flux at 1000 km altitude from electron content measurement at mid-latitudes, Nature, 204, 983-984.
[2] ArturYakovets and Galina Gordienko2017 “Behaviour of Parameters of Nighttime Electron Density Enhancements of the Ionospheric F2 Layer” Geophysical Research Abstracts Vol. 19, EGU2017-1820-1, 2017 EGU General Assembly 2017
[3] Bailey, G. J., R. Sellek, and N. Balan (1991), The effect of interhemispheric coupling on nighttime enhancements in ionospheric total electron content during winter at solar minimum, Ann. Geophys., 9, 738–747.
[4] Balal,N, Rao, P.B., and Iyer, K. N. (1986) Seasonal and solar variations of nighttime anomalous enhancements in total electron content. Proceedings Indian Academy of Sciences, Vol. 95(3), 409-416.
[5] Chen, C. H., Saito, A., Lin, C. H., and Liu, J. Y.2012 “ Long-term variations of the nighttime electron density enhancement during the ionospheric mid latitude summer”, . Geophys. Res., 117, A07313, doi: 10.1029/2011JA017138, 2012
[6] Chen, G., Z. Zhao, Y. Zhang, G. Yang, C. Zhou, S. Huang, T. Li, N. Li, and H. Sun (2012), Application of the oblique ionogram as vertical ionogram, Sci. China Technol. Sci., 55(5), 1240–1244. Cheng, K., Y. N.
[7] Jain, S., Vijay, S.K., Gwal, A.K., and Hung, Y.N. (1995) Night time enhancement in ionospheric electron contents seasonal and solar cycle variations, annals Geophysics, Vol. 13, 256-261
[8] K.Unnikrishnan1, R. Balachandran Nair, and C. Venugopal ,2002 A comparative study of night-time enhancement of TEC at a low latitude station on storm and quiet nights including the local time, seasonal and solar activity dependence” AnnalesGeophysicae (2002) 20: 1843–1850c European Geosciences Union 2002
[9] Kawamura, S., Otsuka, Y., Zhang, S.-R., Fukao, S., and Oliver, W. L., 2000.:” A climatology of middle and upper atmosphere radar observations of thermospheric winds,” J. Geophys. Res., 105, 12777– 12788
[10] Liu, H., Thampi S. V., Yamamoto M., 2010, Phase reversal of the diurnal cycle in the mid latitude ionosphere. J Geophys Res., 115(A1). doi: 10.1029/2009JA014689.
[11] MuzammilMushtaq; Syed NazeerAlam; Faisal Ahmed Khan Afridi and Muhammad Ayyaz 2015 “Effects of Sunspot Cycles on Diurnal and Seasonal Trend of foF2 “ Journal of GeoSpace Science, , Pages: 44-50
[12] Perna, Pezzopane,M, .Zuccheretti, E,.Fagundes, P.R.deJesus,., Cabrera,M.A, .Ezquer, R. G. 2014 “Unusalnighttime impulsive foF2 enhancements at low latitude.” Phenomenology and possible explanations. Advance in space research.(2014)
[13] Singh, NuzhatSardar, Sahla Rizvi, Sanjay Rathore& S K Vijay(2013), Nighttimeenhancement ofionospheric parameters. Indian Journal of Radio & Physics, Vol. 42, 2013, pp240-250
[14] Y. Chen L. Liu H. Le, W. Wan, and H. Zhang 2015 “ Dusk-to-night time enhancement of mid-latitude NmF2 in local summer: inter-hemispheric asymmetry and solar activity dependence “ Ann. Geophys., 33, 711–718, 2015
[15] ZHANG YanYa, LIU LiBo, CHEN YiDing , LIU Jing , YU & L Ming April 2015 “ Key Laboratory of Earth and PlanetaNighttime electron density enhancements at middle and low latitudes in East Asia” Vol.58 No.4: 551–561 doi: 10.1007/s11430-014-49 SCIENCE CHINA Earth Sciences)

Keywords
Ionosphere, foF2, Solar activity Nighttime Enhancement