scostep 2010 (stp12) - Leibniz-Institut für Atmosphärenphysik an der ...

STP12 Abstracts
Berlin, 12 - 16 July 2010
SCOSTEP Symposium 2010
Indonesian Climate Variability due to Solar Terrestrial Interaction
Nugroho Jalu Tejo
National Institute of Aeronautics and Space (LAPAN)
Since a long time ago Sun as the main source of energy of the Earth has been considered to
influence the climate. Various data and methods have been used to show the relationship
between solar activity and climate. This influence may be globally, locally, or regionally, with
or without delay time. Indonesia, as located in equator, between two continents and two
oceans become very important in global atmospheric convection affecting climate by induces
and controls the atmospheric and oceanic circulations.
To ensure the solar activity affecting in cloud cover over Indonesia we compare the period of
both cloud cover all over Indonesia and solar activity parameter, f10.7 by using wavelet
analysis. We found a declining period about 11 years indicating the solar signal especially for
dry seasons (June-August) from 1976-1995 cloud cover satellite data and other signal with the
period of about 6 years down to 3 years. We suggested that eastern Indonesia is dominantly
influenced by ENSO and western by IOD. Pontianak, which represent middle Indonesian
region is suggested correlated strongly with solar activity cycle.