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All Journal Indonesian Journal of Physics (IJP)
Eddy Hermawan
Pusat Pemanfaatan Sains Atmosfer dan Iklim LAPAN Jl. Dr. Junjunan 133, Bandung 40173
Astronomy Computer Science & IT Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering

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The Spectrum Analysis of Rainfall in Indonesia Sinta Berliana Sipayung; Hariadi T.E; Nurzaman A; Eddy Hermawan
Indonesian Journal of Physics Vol 14 No 3 (2003): Vol. 14 No.2, Juli 2003
Publisher : Institut Teknologi Bandung

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Abstract

As a specific region at equatorial, namely maritime continent, the characteristics of meteorological element, especially rainfall in Indonesia is influenced by monsoon climate, called typical rainy and dry season. We have analyzed monthly mean of rainfall measured at twenty two (22) stations over Aceh, Medan, Padang, Jambi up to Biak for the period of 20 years (1970 to 1989). By using bandpass filter and spectrum analysis we could obtain the characteristics and predominance of Indonesian rainfall oscillation. We found that the characteristics of these rainfall could be identified in form of Semi-Annual (SAO), Quasi-Biennial Oscillation (QBO), and EL-Nino/Southern Oscillation (ENSO). We also could identify the predominance peak of these oscillations.
An Application of Radio Acoustic Sounding System (RASS) with Equatorial Atmosphere Radar (EAR) for Continuous Measurement of Atmospheric Virtual Temperature over Kototabang, West Sumatera Eddy Hermawan
Indonesian Journal of Physics Vol 14 No 3 (2003): Vol. 14 No.2, Juli 2003
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (341.02 KB)

Abstract

We have introduced a new Equatorial Atmosphere Radar (EAR) in a collaboration project between Radio Science Center for Space and Atmosphere (RASC), Kyoto University, Japan and the Indonesian National Institute of Aeronautics and Space (LAPAN) at Kototabang, Bukittinggi, West Sumatera. This radar is mainly designed to observe winds and turbulence in the troposphere and lower stratosphere with a good time and spatial height resolution. Numerous studies or research programs with the EAR have been planned. One of them is the observation of fine structure in the vertical profile of atmospheric temperature using Radio Acoustic Sounding System (RASS). Since the full instruments are under construction, we present in this paper a brief review of the basic principle of RASS, especially on the design of an acoustic transmitter measurements with EAR. Aan example the comparison between RASS and radiosonde data on 6 November 2001 is also presented.
Co-Authors Hariadi T.E Nurzaman A Sinta Berliana Sipayung