Sudden commencements in the X and Y fields at equatorial stations in the African sectorReport as inadecuate




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Earth, Planets and Space

, Volume 59, Issue 5, pp 397–400

First Online: 08 June 2007Received: 26 December 2005Revised: 27 June 2006Accepted: 07 July 2006

Abstract

This paper describes the mean direction of the H vector due to Sq solar quiet and SC sudden commencement at equatorial stations Addis-Ababa geographical longitude: 39°E and at M’Bour 17°W. The Sq H vector aligns fairly well with the direction of the dip declination D, and the SC H vector aligns along the dipole declination Ψ minus the dip declination D. At M’Bour, which is situated in the Atlantic Anomaly region, both the Sq H and the SC H vectors were along 32°W of N, while the dip as well as the dipole declinations were 9°W. Thus, the normal and the disturbance current in the Atlantic region is modulated by some additional meridian currents, resulting in a large increase in the westward Y, the source of which cannot be currently estimated from only one station, M’Bour. This problem requires further investigation.

Key wordsEquatorial sudden commencements meridional electrojet current  Download to read the full article text



Author: R. G. Rastogi

Source: https://link.springer.com/



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