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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 210 Documents
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KARAKTERISTIK LONTARAN MASSA KORONA (CME) YANG MENYEBABKAN BADAI GEOMAGNET Clara Y Yatini; - Suratno; Gunawan Admiranto; Nana Suryana
Jurnal Sains Dirgantara Vol 6, No 1 (2008)
Publisher : Lembaga Penerbangan dan Antariksa Nasional

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Abstract

Dari hasil identifikasi terhadap lontaran masa korona (CME) yang mengakibatkan munculnya badai geomagnet yang kuat selama tahun 1996 sampai 2006 diperoleh bahwa CME tersebut terdistribusi secara asimetris di permukaan matahari, khususnya terhadap meridian matahari. CME ini lebih banyak yang berasal dari bagian barat matahari dari pada bagian timur, terkait dengan medan magnet antar planet yang melengkung. Waktu yang diperlukan oleh CME untuk sampai di bumi dan menyebabkan badai geomagnet tidak sepenuhnya bergantung pada kecepatan awal CME tersebut. Kecepatan CME dan keterkaitannya dengan flare juga tidak menentukan efektivitasnya dalam menimbulkan gangguan. Oleh sebab itu sangat sulit memprakirakan dampak CME terhadap bumi hanya dengan melihat peristiwa yang terjadi di matahari, karena medium antar planet juga harus dipertimbangkan. Kata kunci: CME, Badai geomagnet.
PENGARUH SOLAR PROTON EVENT JANUARI 2005 TERHADAP PENIPISAN OZON STRATOSFER DI INDONESIA johan Muhamad; Novita Ambarsari
Jurnal Sains Dirgantara Vol 9, No 1 (2011)
Publisher : Lembaga Penerbangan dan Antariksa Nasional

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Abstract

Ozone data from Ozone Monitoring Instrument (OMI) and Microwave Limb Sounder (MLS) Aura satellite were used to investigate the impacts of the very intense Solar Proton Events (SPE) 15-25 January 2005 on the stratospheric ozone in Indonesia. From the ozone vertical profiles along the SPEs period, the decreasing of ozone concentration was observed after the peak of the SPEs. This ozone decrease was associated with the increase of NO2 and HO2 concentration which was produced due to the ionization by the energetic protons. The ozone decrease was also identified by analyzing the spatial column amount ozone in Indonesia. The ozone decrease after the SPEs was about 8 percent from the average of daily column amount ozone before the SPEs. The very high energetic protons from the SPEs were suspected to be responsible for the possibility of the proton precipitation into the low latitude regions. Keywords: Solar Proton Event, Stratospheric ozone depletion, Low latitude proton precipitation 
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
Back Pages JSD Vol 13 No 2 Juni 2016 Redaksi Jurnal
Jurnal Sains Dirgantara Vol 13, No 2 (2016)
Publisher : Lembaga Penerbangan dan Antariksa Nasional

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Abstract

Back Pages JSD Vol 13 No 2 Juni 2016
ANALISIS POLA CURAH HUJAN INDONESIA BERBASIS LUARAN MODEL SIRKULASI GLOBAL (GCM) Sinta Berlian Sipayung; Lely Qodrita Avia; Bambang Dwi Dasanto; - Sutikno
Jurnal Sains Dirgantara Vol 4, No 2 (2007)
Publisher : Lembaga Penerbangan dan Antariksa Nasional

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Abstract

The analysis of rainfall pattern over indonesia based on the Global Circulation Model (GCM) such as the CGCM3.1(T47) and CSIRO Mk-3 for one hundred years observation (1900-2000) over three different types of Indonesia rainfall pattern has already been done. They are Lampung, Jakatra, and Kupang for the monsoon type, Ambon for the local type, and Padang and Solok for the equatorial type, repectively. Since the grid resolution of the GCM data is low relatively, we applied the Statistical Downscalling (SD) based on the Pricipal Component Regression (PCR). We found an a good agreement between both model with the rainfall in-situ measurement in between 0.6 up 0.76, except for Kupang. We found also that both model has a similar pattern comparing with the rainfall in-situ measurement. While, by applying the Principal Component Regression (PCR), we found an a good agreement also of both model than 65% with the total variability is about 90%.
USIA DAN KEGANDAAN OGLE-LMC 316/317 (THE AGE AND BINARITY OF OGLE-LMC 316/317) Rhorom Priyatikanto
Jurnal Sains Dirgantara Vol 15, No 1 (2017)
Publisher : Lembaga Penerbangan dan Antariksa Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (87.085 KB) | DOI: 10.30536/j.jsd.2017.v15.a2423

Abstract

Large Magellanic Cloud (LMC) is a home of thousands of star clusters with various ages and metallicities. This galaxy also becomes the ideal laboratory for understanding binary cluster population which is large in number. One of the binary cluster candidates within the galaxy is OGLE-LMC 316/317 which is located near the bar of LMC. The age of OGLE-LMC 317 had not been determined, while the age of OGLE-LMC 316 was doubted. Whereas, age is an important parameter in the study of system binarity. In this study, photometry data from Optical Gravitational Lensing Experiment (OGLE) was used to construct color magnitude diagram and to estimate the age of OGLE-LMC 316/317. The results were the estimated ages of OGLE-LMC 316 and OGLE-LMC 317 which were 63 and 160 million years respectively. Based on these results, OGLE-LMC 316/317 system which has projected separation of 5 pc can be considered as primordial and coeval binary star cluster. ABSTRAK Large Magellanic Cloud (LMC) merupakan rumah bagi ribuan gugus bintang dengan beragam usia dan metalisitas. Galaksi ini juga menjadi laboratorium ideal untuk memahami populasi gugus ganda yang melimpah jumlahnya. Salah satu kandidat gugus ganda di dalamnya adalah OGLE-LMC 316/317 yang terletak di dekat batang LMC. Usia OGLE-LMC 317 belum diketahui, sementara usia OGLE-LMC 316 masih disangsikan. Padahal usia adalah parameter penting untuk mempelajari kegandaan dari sistem ini. Pada studi ini, data fotometri Optical Gravitational Lensing Experiment (OGLE) digunakan untuk membangun diagram warna magnitudo dan memperkirakan usia OGLE-LMC 316/317. Hasilnya, OGLE-LMC 316 diperkirakan berusia 63 juta tahun sementara OGLE-LMC 317 setidaknya berusia 160 juta tahun. Berdasarkan hasil ini, sistem OGLE-LMC 316/317 yang memiliki jarak pisah di bidang langit sebesar 5 pc dapat dianggap sebagai gugus ganda primordial dan coeval.
PENETUAN RADIUS BULIR DARI FOTOMETRI ASTRONOMI: PERBANDINGAN TIGA METODE BERBASIS MODEL MIE Nuning Nuraini; Hakim L. Malasan; Tri W. Hadi
Jurnal Sains Dirgantara Vol 2, No.1 Desember (2004)
Publisher : Lembaga Penerbangan dan Antariksa Nasional

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Abstract

This paper discusses modeling steps of the total extinction coefficients,deduced from the astronomical photometric observations, to estimate aerosol perticulate size in the atmospheric layer. One important step in modeling is the application of Mie theory through Wempe's extinction law for aerosol and introduced by Angstrom (1929), i.e. The factor Qext is derived by elaborating Mie theory, through extinction efficiency factor which has been normalized, and an assumption that particle size is represented by a log-normal distribution. Final result of aerosol radius is deduced by fitting a decomposed observed extinction coefficient with that computed using the three Mie theory developed to estimate the best aerosol particulate's size.
ARUS CINCIN DAN PENGARUHNYA TERHADAP MEDAN GEOMAGNET DI WILAYAH INDONESIA (RING CURRENT AND IT'S EFFECT ON THE GEOMAGETIC FIELD IN INDONESIA REGION) Mamat Ruhimat
Jurnal Sains Dirgantara Vol 13, No 1 (2015)
Publisher : Lembaga Penerbangan dan Antariksa Nasional

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Abstract

Arus cincin yang mengalir di ionosfer sekitar ekuator dapat diketahui keberadaannya pada kejadian gangguan geomagnet. Dalam peristiwa rekoneksi magnet terjadi transfer energi dari angin surya menuju magnetosfer bagian dalam. Energi ini diteruskan hingga terekam di permukaan Bumi dan menyebabkan adanya penurunan intensitas medan geomagnet yang dikenal dengan gangguan geomagnet. Dengan menggunakan data angin surya dan medan magnet antarplanet, dapat diperkirakan besarnya energi kopling angin surya magnetosfer, medan listrik merger, dan energi injeksi untuk arus cincin. Dari tiga kejadian yang dianalisis, dua di antaranya yaitu pada 3 Mei 2010 dan 29 Mei 2010 memiliki energi injeksi untuk arus cincin masing-masing Q =14,8 nT/jam dan 21,4 nT/jam. Berdasarkan hasil pemetaan gangguan geomagnet di wilayah Indonesia terlihat adanya pergeseran gangguan geomagnet dari Timur ke Barat. Hal ini menunjukkan adanya aliran arus cincin yang mengalir dari Timur ke arah Barat. Sedangkan kejadian 12 Juni 2010 menghasilkan energi injeksi yang rendah Q = 2,9 nT/jam, dan tidak menunjukan adanya arus cincin.Kata Kunci: Gangguan geomagnet, Magnetosfer, Angin surya, Transfer energi, Arus cincin
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.
PREDIKSI JANGKA PENDEK BULANAN JUMLAH FLARE DENGAN MODEL ARIMA (p,d,[q]), (P,D,Q)132 Nanang Widodo
Jurnal Sains Dirgantara Vol 4, No.1 Desember (2006)
Publisher : Lembaga Penerbangan dan Antariksa Nasional

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Abstract

The time series of the monthly of flares from January 1965 to December 2004 is analyzed by ARIMA models. It is suggested that there is any auto correlation between monthly data in regular and seasonal order (11 years solat activity cycle) in the ARIMA (p,d[q]), (P,D,Q)132 models. After several of feasibility test had successed and the assumption of stationary in mean and variance was obtained, we can determine the model i.e; ARIMA (1,1,[13])(0,1,1)132 and ARIMA (0,1,[13])(0,1,1)132. From this models, we can use to predict the monthly number of flares.

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