NDLI: Low Latitude Tec Variations for Three Consecutive Solar Cycles

Content Provider	Springer Nature Link
Author	Krishnankutty, T. N. Jayachandran, B.
Copyright Year	1997
Abstract	Hourly values of the total electron content (TEC) for the low latitude station of Hawaii (21.2°N, 157.7°W) during the last three consecutive solar cycles 20, 21 and 22 are used to study the long term and short term variations of TEC for this low latitude station. It is found that for perfectly quiet days, a linear variation for the daytime peak values of TEC (TEC$_{max}$) with S$_{10.7}$ solar flux exists even for high solar flux values of S$_{10.7}$ during the winter and equinox seasons of the three solar cycles. However, during summer a ‘levelling off’ effect in TEC$_{max}$ is observed beyond about 180 units of S$_{10.7}$. The long term dependence of TEC$_{max}$ on solar activity is found to be less sensitive during summer compared to winter and equinox for the three solar cycles. In contrast to the behaviour of TEC$_{max}$, the solar activity dependence of TEC$_{min}$ (morning minimum values of TEC) for the three solar cycles is found to be strongest in summer and weakest in winter. The time difference between TEC$_{max}$ and TEC$_{min}$ remains more or less constant for the entire solar flux range during winter and equinox in the three solar cycles. However, during summer this time difference shows a decreasing trend with increasing solar flux indicating a ‘levelling off’ effect of TEC$_{max}$ for higher solar flux values in summer. There is good correspondence in the diurnal variation of the day to day variations in TEC for the respective seasons of the solar maximum and minimum phases during the three solar cyles.
Starting Page	271
Ending Page	278
Page Count	8
File Format	PDF
ISSN	12178977
Journal	Acta Geodaetica et Geophysica Hungarica
Volume Number	32
Issue Number	3-4
e-ISSN	15871037
Language	English
Publisher	Springer Netherlands
Publisher Date	2013-08-22
Publisher Institution	Quarterly of the Hungarian Academy of Sciences
Publisher Place	Dordrecht
Access Restriction	Subscribed
Subject Keyword	S10.7 solar flux TEC perfectly quiet days solar cycle total electron content Geophysics/Geodesy solar maximum solar minimum solar phase
Content Type	Text
Resource Type	Article
Subject	Building and Construction Geology Geophysics

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