Local time dependence of the equatorial counter electrojet effect in a narrow longitudinal belt.

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概要

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• Irregular occurrence characteristics of the equatorial counter electrojet phenomena at different longitudinal zones are investigated using the magnetic data of the horizontal component 'H' at the two equatorial stations Trivandrum and Addis Ababa, separated in longitude by about 40°. The limited longitudinal extent of the counter electrojet (CEJ) events are examined on the basis of the occurrence of the phenomenon at different local time intervals. Importance of the solar semi diurnal tides in modifying the equatorial counter electrojet phenomena at Trivandrum and Addis Ababa is discussed during these local time groups. Dominance of semi-diurnal tidal modes of varying magnitude is found to influence the local time occurrence behaviour of CEJ events over the equator. Peculiarities of both the change in amplitude and phase pattern of the diurnal variation of the 'H' component within the narrow longitude sector, especially during the noon hours, indicate the modulation of the diurnal variation of the equatorial electrojet currents by vertical wind shears of highly localised nature.

• 公益社団法人 日本地震学会、地球電磁気・地球惑星圏学会 、特定非営利活動法人 日本火山学会、日本測地学会、日本惑星科学会の論文

著者

• Alex S.

  Indian Inst. Of Geomagnetism Navi Mumbai Ind

• Mukherjee S.

  Indian Institute Of Geomagnetisim

関連論文

• Magnetospheric Contribution to Low Latitude Sq Variation
• Nighttime enhancement of the amplitude of geomagnetic sudden commencements and its dependence on IMF-Bz
• Seasonal Variations of Geomagnetic D, H and Z Fields at Low Latitudes
• Day-to-day variability in the occurrence characteristics of Sq focus during d-months and its association with diurnal changes in the Declination component
• Local time dependence of the equatorial counter electrojet effect in a narrow longitudinal belt
• Local time dependence of the equatorial counter electrojet effect in a narrow longitudinal belt.

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