Sq (H) Solar Variation at Yaoundé-Cameroon AMBER Station from 2011 to 2014
| Autor: | F. Anad, Messanga Etoundi Honore, Ngabireng Claude Marie, Mbane Biouele Cesar |
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| Rok vydání: | 2017 |
| Předmět: | |
| Zdroj: | International Journal of Geosciences. :545-562 |
| ISSN: | 2156-8367 2156-8359 |
| Popis: | This paper presents the earth’s magnetic field variations on quiet days using data from 2011 to 2014 provided by the AMBER station located at the University of Yaounde 1 (Cameroon), whose geographic and geomagnetic coordinates are respectively: (3.87°N, 11.52°E) and (5.8°S, 83.1°E). The variability of the H horizontal component of the Earth’s magnetic field was examined using the North (X) and East (Y) components of the earth’s magnetic field. The H component is then used to calculate and analyze the diurnal, monthly and seasonal Solar quiet variations Sq (H) observed in Yaounde-Cameroon during quiet magnetic days. The results obtained show that the Sq (H) variations are seasonal. e.g., in Spring the Sq (H) amplitude (~72 nT) is larger than that of Autumn (~69 nT). The maximum values of Sq (H) vary from 48.8 nT to 57.12 nT in summer and from 41 nT to 60 nT in winter from the years 2011 to 2014. In general, these maximum values are observed around 12:00 and 13:00 in local time. These results show that the morphology of Sq (H) in Yaounde is presented as a function of seasons. Moreover, the Sq (H) values are negative during morning hours (01:00 - 06:00) and afternoon hours (18:00 - 24:00) in local time throughout all months and all seasons. This significant negative excursion of Sq (H) in Yaounde during the night time might be due to other physical processes such as storms or thunderclouds or to the existence of a strong induced current in Yaounde which can affect the ground-based instruments. By referring to the solar cycle 24, our results show that the Sq (H) amplitude varies with the solar activity. The aim of this work is to analyze the diurnal, monthly and seasonal variations of Sq (H) observed in Yaounde from 2011 to 2014. |
| Databáze: | OpenAIRE |
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