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INDONESIA
Jurnal Sains Dirgantara
Published by Lembaga Penerbangan dan Antariksa Nasional
ISSN : -     EISSN : -     DOI : -
Core Subject : Education,
Education
Arjuna Subject : -
Articles 6 Documents
 1 
Search results for , issue "Vol 3, No.2 Juni (2006)" : 6 Documents clear
PENGARUH OZON TERHADAP HUJAN ASAM DI BANDUNG Tuti Budiwati; - Sumaryati; Iis Sofiati; Tuti Mulyani HW; M. Pariyatmo
Jurnal Sains Dirgantara Vol 3, No.2 Juni (2006)
Publisher : Lembaga Penerbangan dan Antariksa Nasional

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Abstract

The monthly of concentration of surface ozone at Dago (north Bandung) from January 2001 to June 2003 of 38.30 μg/m3. This value is higher than other four stations, Cisaranten Wetan and Aria Graha (East Bandung), Batununggal Indah (South Bandung) and Tegallega (Central Bandung) within variations 35.26-36.23 μg/m3. While SO2, NO2 gases, SO42-, NO3-, NH42+ ions, and pH of rainwater are measured at five locations, i.e. Cipedes (West Bandung), Martadinata (East Bandung), Dago (North Bandung), Kopo (South Bandung) and Kebon Kalap (Central Bandung) from August 2000-May 2003. The worst condition of acid rain was found at Cipedes with value of 5.09. This condition means that locations have been affected by acid rain in August 2000 - May 2003, because the value of pH less than 5.60 (the threshold of acid rain). Other locations such as Martadinata, Kebon Kalapa, and Kopo have average value of pH of 5.75, 5.95, and 6.00, respectively. While Dago which represents cleanest region of five locations in Bandung has average of pH of 6.06. The existence of zone have not influenced yet the deposition of acid rain in Bandung in general, especially at Dago, if we see the biggest value of correlation coefficient on that region of 0.64. The influence of ozone is more dominant to SO2 compared to NO2 based on acid deposition formed. The pollutant of SO2, No2 gases, and aerosol from the local source influences on concentration of sulfate and nitrate ions which have the important role on acid rain.
ESTIMASI PARAMETER TURBULENSI UNTUK JASA PENERBANGAN BERBASIS HASIL ANALISIS BEBERAPA DATA RADIOSONDE DI KAWASAN BARAT INDONESIA Eddy Hermawan; Zainal Abidin
Jurnal Sains Dirgantara Vol 3, No.2 Juni (2006)
Publisher : Lembaga Penerbangan dan Antariksa Nasional

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Abstract

The one of an important thing related to the aviation is the correct information of aviation meteorology, especially about bad weather condition such as turbulence that often disturb the plane during their flight. There are many parameters to estimate the turbulence parameter. One of them is called the Richardson Number (Ri) such as already investigated by Waco (1970). We continued hos study by applying the radiosonde data distributed at five stations in the Western part of Indonesia region, especially during the Coupling Processes Equatorial Atmoephere I (CPEA I) Campaign started from April 10 to May 10, 2004. We defined the turbulence when Ri less more 0.25 as described by Killer (1981). We found initial turbulence occurrence indication, even though we have found significant indication yet, related with less of locations and data observations which is only one month observation. Turbulance in the plane is described as the changes of vertical gravitation in the plane and observed by vertical accelerometer which is installed in the plane. After making some validations with the vertical accelerometer data, we found only a few good correlation between Ri and turbulence. We suspect it caused by the less of data observation. But initial indication based on data analysis shows that light turbulence occurrence a long Eastern Coast of Malacca Peninsula on 19th April 2004.
DAMPAK CUACA ANTARRIKSA PADA VARIABILITAS IKLIM DI INDONESIA Wilson Sinambela; Iyus E.Rusnadi; Nana Suryana
Jurnal Sains Dirgantara Vol 3, No.2 Juni (2006)
Publisher : Lembaga Penerbangan dan Antariksa Nasional

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Abstract

Since a long time ago the Sun as the main source of energy of the Earth is considered to give influence the Earth's climate. It is seen from the analysis of solar activity influence on surface air temparature in various cities in Indonesian area using available data. The result Weighted Wavelet Z-transform (WWZ) analysis of surface air temperature which shows siilarity between periodicity of that of solar activity, especially about 11 yaer, is the first indications of the influence of space weather to the Indonesian climate variability. Additionally, from statistical analyzes by using 11 years-running moving averages, it is seen that the pattern of surface air temperature changes follows the pattern of solar activity variability, although they are sometimes out of phase and move ahead in about 5-15 years. Furthermore, although time series data of surface air temperature is limited, the result shows a good correction between the changes of surface air temperature and solar cycle length/SCL with an applied smoothing with the coefficients 1-2-2-2-1 (from now on we call SCL 12221). We therefore find that this agreement supports (although it does not prove) the sugestion of a direct solar activity influence on surface air temperature in Indonesia.
ANALISIS STABILITAS ATMOSFER PADA LAPISAN TROPOSFER ATAS DAN STRATOSFER BAWAH DI ATAS KOTOTABANG MENGGUNAKAN DATA EQUATORIAL ATMOSPHERE RADAR (EAR), BOUNDARY LAYER RADAR (BLR) DAN RADIOSONDE Eddy Hermawan; Sri Hartati Soeparno; Filla Aulifin Kemirah
Jurnal Sains Dirgantara Vol 3, No.2 Juni (2006)
Publisher : Lembaga Penerbangan dan Antariksa Nasional

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Abstract

This paper is mainly concerned to the analysis of atmospheric stability especialy near the tropopause layer as well as the variation on wet and dry seasons over Kototabang area, West Sumatera (0.2˚S;100.32˚E) using Equatorial Atmosphere Radar (EAR), Boundary Layer Radar (BLR) and radiosonde data. The Observation of atmosphere stability nearby the tropopauselayer is very important, condering its function as a buffer of an air masses exchanges from troposphere to stratosphere layer and so the contrary, which is usually called as Statosphere - Troposphere Exchange (STE). Data analysis divide in two stages, firstly is the short periode data analysis from Aptil, 10th until May, 9th of 2004 with the main pupose of validation between vertical echo power (VEP) from EAR and Brunt-Vailsala Frequency Squared (N2) from radiosondes. The result shows that the average of correlation coeffisient from 9 observations is 0.81. This point shows that EAR's ability to replace radiosondes data to inform atmosphere stability. The second stage, contain the long periode data analysis from June and November in the years of 2001 until 2004. Both month representing dry and wet seasons based on monthly Global Precipitation Climatology Project (GPCP) data over 25 years (1979-2004) observations in Sumatera Inland area, specifically for Kototabang. Final result shows that the tropopause height variation in dry season (November) is easier to identify. In the other side, zonal wind dominant in November compare to vertical wind on July. This situation probably because the strong monsual affect in wet seasons. The tropopause height is also estimate have no significant effevt to rain intensity.
RESPONS SINTILASI SINYAL GPS SAAT BADAI GEOMAGNET DI LINTANG RENDAH - Aswati
Jurnal Sains Dirgantara Vol 3, No.2 Juni (2006)
Publisher : Lembaga Penerbangan dan Antariksa Nasional

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Abstract

S4 in dex data of ISM (Ionospheric Scintillation Monitoring) at Pontianak and Pare-pare have been used to analyze the response of ionospheric scintillation during magnetic strom at low latitude. The ionospheric scintillation observed by a GPS receiver of L1 (1.57542 GHz) signals to measure both amplitude and phase variations during the geomagnetic storm of April 6, 2000 and July 15, 2000. Observation of S4 index during geomagnetic storm of April 7, 2000 at Pontianak and July 16, 2000 at Parepare did not show the main phase. This result is in agreement wiyh the hypothesis of the effect of the ring current in the generating or inhibition of F layer irregularities during magnetic storm. Since the minimum excursion of Dst during the magnetic storm on April 6 and July 15, 2000 are near midnight (24.00 UT) or around 07.00 Local Time (LT) on April 7 and July 16, 2000, so that the excursion categorized by excursion Dst takes place during daytime and well before sunset, where shown scintillation are inhibited.
PERIODE-LUMINISITAS CEPHEID DAN KOREKSI BOLOMETRIK BINTANG DERET UTAMA : METODOLOGI DAN HASIL Avivah Yamani.R; S. Siregar
Jurnal Sains Dirgantara Vol 3, No.2 Juni (2006)
Publisher : Lembaga Penerbangan dan Antariksa Nasional

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Abstract

Chepeids variable stars define as istance candle, espicially for local galaxies. In this paper, we derive Luminosity-Period relation. We estimate the model base on distribution pattern of Mv versus log P, Primary data taken from Storm et, al. (2004). Least squares methods being use to estimate regression coefficients. In our work, we find Mv = -2.83 log P-1.3 for Galactic Chepeids and Mv = -6.69 log P + 3.38 for Small Magellan Cloud. We discuss the factors that make the gradient separation with previous results. Bolometric correction we use here are from the main sequence stars (Cox, 2000). We use least squares method to fit while regression correction estimate with Cramer method. Regression equation that we have is : BC = -8.96(log Teff)2 + 70.23 logTeff - 137.83

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