Research

The manifestation of the Madden-Julian oscillation in global deep convection and in the Schumann resonance intensity


Reference:

Anyamba, E., Williams, E., Susskind, J., Fraser-Smith, A. and Fullekrug, M., 2000. The manifestation of the Madden-Julian oscillation in global deep convection and in the Schumann resonance intensity. Journal of the Atmospheric Sciences, 57 (8), pp. 1029-1044.

Related documents:

This repository does not currently have the full-text of this item.
You may be able to access a copy if URLs are provided below.

Abstract

This study determines the relationship between intraseasonal oscillations observed in two independent measures of global lightning activity: a global mean convective index (a proxy for deep convection) derived from the Goddard Television Infrared Observational Satellite (TIROS) Operational Vertical Sounder (TOVS) Pathfinder infrared cloud observations, and Schumann resonance magnetic intensity recorded at Arrival Heights, Antarctica. The study was initiated when previous results indicated a possible link between intraseasonal variations in Schumann resonances and variability of sunspot numbers on the timescale of the solar rotation period. The authors used seven years (1989-95) of daily records, though the Schumann resonance record had a number of gaps. Results of cross-spectrum and composite analysis show that intraseasonal oscillations in deep convection modulate the global variations in the Schumann resonance intensity. In the Tropics, the intraseasonal wave in deep convection has a wavenumber-1 structure with the region from 120 degrees W to 60 degrees E having one phase, while the other hemisphere has the opposite phase. The Schumann resonances are enhanced when a maximum in deep convection lies in the former hemisphere that comprises the main lightning-producing regions of South America and Africa. Conversely, Schumann resonances are suppressed when the convection propagates eastward to the Indian Ocean and the western Pacific Ocean. This relationship between the deep convection and Schumann resonances was best defined during the Northern Hemisphere springs of 1990 and 1992 but was less evident in 1993 and 1994.

Details

Item Type Articles
CreatorsAnyamba, E., Williams, E., Susskind, J., Fraser-Smith, A. and Fullekrug, M.
DepartmentsFaculty of Engineering & Design > Electronic & Electrical Engineering
RefereedYes
StatusPublished
ID Code12907

Export

Actions (login required)

View Item