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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 7, No 2 (2010)" : 6 Documents clear
DINAMIKA ORBIT ASTEROID YANG ANALOG DENGAN ORBIT BUMI - B. Dermawan; - T. Hidayat; - M. Putra; - A. Fermita; - D. T. Wahyuningtyas; - D. Mandey; - Z. Hudaya; - D. Utomo
Jurnal Sains Dirgantara Vol 7, No 2 (2010)
Publisher : Lembaga Penerbangan dan Antariksa Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (923.264 KB) | DOI: 10.30536/j.jsd.2010.v7.a1122

Abstract

A set of asteroids that belong to Atens and Apollos groups which orbits are crossing the Earth at 1 AU is known as Earth-like-Orbit Asteroids. As of 1 July 2009, there were 19 Earth-like-Orbit Asteroids listed at the JPL (Jet Propulsion Laboratory – NASA) Small-Body Database. Orbital dynamics of five new asteroids among them (2008 EV5, 2008 JE, 2008 KT, 2008 UA202, and 2008 UC202) have not been studied yet. This study is important because they are asteroids belonging to potentially hazardous objects. High accuracy orbital integrations for a time-span of –1000 to +1000 yr have been conducted to figure out their evolutionary tracks. Our results show that high inclination Earth-like-Orbit Asteroids of more than ~5 degrees tend to be more dynamically stable than those of lower orbital inclination which often switch over from Atens to Apollos and vice versa. Four new Earth-like-Orbit Asteroids are found to have potential collisions with Earth because they will encounter the Earth at minimum distances of less than 0.01 AU. Keywords: Asteroids, Orbit dynamics, Hazardous objects
FLUKS DAN DISTRIBUSI PARTIKEL ENERGETIK DI ORBIT LEO PENYEBAB TERJADINYA ANOMALI SATELIT Nizam Ahmad; - Rasdewita K.
Jurnal Sains Dirgantara Vol 7, No 2 (2010)
Publisher : Lembaga Penerbangan dan Antariksa Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (3524.498 KB) | DOI: 10.30536/j.jsd.2010.v7.a1121

Abstract

The variation of satellite anomaly caused by the impact of energetic particle depends on the energy and particle fluxes distributed on the region of satellite placement. The determination on fluxes and particle distribution in low earth orbit was done by analyzing the satellite anomaly cases from the year of 2000 until 2009 and using particle data from NOAA 15 satellite. The analysis gives information about 6 anomaly cases occurred at high latitude, 3 cases at mid latitude dan 12 cases at low latitude. Most satellite anomaly cases caused by proton and electron simultaneously, wherein the flux order about 104 up to 106 particles/cm3 and the energy, E > 30 keV for electron and 80 litlle than E litlle than 240 keV for proton. This analysis also shows most anomaly cases were occurred on polar satellite at 23 local time. Keywords: Satellite anomaly, Proton, Electron
PENGELOMPOKAN WILAYAH CURAH HUJAN KALIMANTAN BARAT BERBASIS METODE WARD DAN FUZZY CLUSTERING Ina Junaeni; Dewi Yuliani; Risana Ayahbi; - Noersomadi; - Nurzaman; Teguh Hardjana
Jurnal Sains Dirgantara Vol 7, No 2 (2010)
Publisher : Lembaga Penerbangan dan Antariksa Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (878.885 KB)

Abstract

In order to decrease the climate information gap, the rainfall clustering based on the TRMM data is presented. Then, the rainfall pattern could be determined for all region. Using the principal component analysis as the interface, clustering analysis, namely the Ward and the Fuzzy Clustering methods, the rainfall in West Kalimantan could be grouped in to four clusters according to its homogenity. The first cluster consists of grids that gather in the Karimata strait, Java Sea, and some area in West Kalimantan Lands. The second group was built by grids in the land with homogeneous topography. The third group in the middle of West Kalimantan was a cluster in the land which has different elevation. The fourth group was a cluster in the northern Kalimantan and close to the South China Sea. The West Kalimantan rainfall derived from the TRMM data has the equatorial and monsoonal patterns. The monsoonal pattern was exhibited by the cluster in the ocean (first cluster), and the equatorial pattern was showed by clusters in the land (second, third, and fourth clusters). The equatorial rainfall pattern revealed that the first wet month occuring in April, whereas the second wet month occured in December or January. The month with lowest rainfall is August. Key word: Rainfall pattern, Rainfall cluster, Ward and Fuzzy Clustering methods
ANALISIS ALTERNATIF PENEMPATAN SATELIT LAPAN A2 DI ORBIT Nizam Ahmad
Jurnal Sains Dirgantara Vol 7, No 2 (2010)
Publisher : Lembaga Penerbangan dan Antariksa Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1136.113 KB) | DOI: 10.30536/j.jsd.2010.v7.a1120

Abstract

The preliminary orbit design of LAPAN A2 satellite takes an assumption that the satellite will be launched on October, 2011. This design used a scenario of satellite placement in orbit at altitude of about 650km, 800 km and 870 km and inclinations of 8, 10 and 20. The orbit analysis shows that if the satellite will be launched in Sriharikota, India, it will be only possible for inclination of 20. A satellite at an altitude of 800 km is more effective for a remote sensing mission than that of 650 km and 870 km, because it will pass Indonesia region 14 times a day with the total swath width is 4205.75 km and time in view is about 11 minutes. In addition, the satellite will revolve the earth 14 times a day with the periode of about 100.85 minutes. Keywords: Satellite, Orbit
ANALISIS KORELASI PEARSON UNTUK UNSUR-UNSUR KIMIA AIR HUJAN DI BANDUNG Tuti Budiwati; Afif Budiyono; Wiwiek Setyawati; Asri Indrawati
Jurnal Sains Dirgantara Vol 7, No 2 (2010)
Publisher : Lembaga Penerbangan dan Antariksa Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (150.329 KB)

Abstract

Pearson correlation coefficients are used to study influences of chemical and meteorological factors to rain water characteristic. The chemical composition of rain water analysis is composed of anion variables such as sulphates (SO42-), nitrates (NO3-), chlorides (Cl-), and cation variables such as ammonium (NH4+), calsium (Ca2+), kalium (K+), sodium (Na+) and magnesium (Mg2+). Furthermore, other active variables such as pH and electric conductivity (EC) influences are also assessed. The statistical analysis is used to obtain a more comprehensive assessment in order to understand acid rain events. The acid rain is often correlated to strong meteorological factor influences such as rainfall. Therefore, the study is carried out for two different seasons in Bandung, i.e. wet and dry seasons.Keywords: Anion, Cation, Electric conductivity (EC), Pearson correlation coefficient, pH
ANALISIS SEMBURAN RADIO MATAHARI TIPE II SEBAGAI PREKURSOR KEMUNGKINAN TERJADINYA BADAI MAGNET BUMI - Suratno; Santi Sulistiani
Jurnal Sains Dirgantara Vol 7, No 2 (2010)
Publisher : Lembaga Penerbangan dan Antariksa Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (7068.417 KB) | DOI: 10.30536/j.jsd.2010.v7.a1119

Abstract

The solar flare, type II solar radio bursts and Coronal Mass Ejection (CME) are the serial phenomena of the sun which have a closed association. The occurence of type II solar radio bursts is triggered by passing of shock wave and is showing the ejection of plasma and magnetic fields. The shock wave or CME travelling toward the earth’s upper atmosphere can lead to the occurence of geomagnetic storm. Since the bursts propagation mechanism is by means of electromagnetic radiation and reaches the earth within 8 minutes, the shock wave or CME will reach the earth within 40 to 80 hours or even it is exceeding 5 days, hence, the type II bursts can be used as an early indicator information of the possibility incident of the geomagnetic storm. This investigation is carried out by analysing the travel time of shock wave which is determined from the dynamic spectra of type II solar radio bursts and the onset time of the geomagnetic storm. This travel time then is compared to the difference between start time of type II bursts and the instant of minimum Dst (Disturbance storm time). This analysis is supported by the data of active region position on the solar disk as a source of bursts and the direction of interplanetary magnetic field. Keyword: Solar flare, Type II solar radio bursts, Geomagnetic storm

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