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Jurnal Sains Dirgantara
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Articles 168 Documents
PERIODE-LUMINISITAS CEPHEID DAN KOREKSI BOLOMETRIK BINTANG DERET UTAMA : METODOLOGI DAN HASIL Yamani.R, Avivah; Siregar, S.
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
PENGAMATAN AWAN CIRRUS SUBVISIBLE DI ATAS BANDUNG MENGGUNAKAN RAMAN LIDAR (STUDI KASUS: BULAN SEPTEMBER 2000) Hamdi, Saipul; Kaloka, Sri
Jurnal Sains Dirgantara Vol 2, No.1 Desember (2004)
Publisher : Lembaga Penerbangan dan Antariksa Nasional

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Abstract

Lidar Equipment has been developed by some lidar groups, and shows good performance for monitoring vertical profile of water vapour, temperature, and aerosol. In 1996, lidar equipment has been installed in LAPAN Bandung under joint research between Indonesia and Japan, and start for intensively observation since the beginning of 1997. There are several parameters can be taken by Lidar i Bandung, i.e. vertical distribution of backscattering ratio, depolarization ratio, and temperature. Observation taken in September 17th, 2000 is simultaneously to radiosonde observation. At this time we detect the existence of optically this layerjust below tropopause. We suggest this layer as subvisible cirrus cloud. This layer is 2 km thick and temperature is in range -70℃ to -80℃. Depolarization ratio of this layer is 10% or more, and backscattering ratio is less than 3.
Full Draft JSD Vol 14 No 2 Juni 2017 Jurnal, Redaksi
Jurnal Sains Dirgantara Vol. 14 No. 2 Juni 2017
Publisher : Lembaga Penerbangan dan Antariksa Nasional

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Full Draft JSD Vol 14 No 2 Juni 2017
HUBUNGAN AIR TERKANDUNG DENGAN REFLEKTIFITAS RADAR Hermawan, Eddy; Handayati, Yuanita
Jurnal Sains Dirgantara Vol 5, No.1 Desember (2007)
Publisher : Lembaga Penerbangan dan Antariksa Nasional

Show Abstract | Original Source | Check in Google Scholar | Full PDF (260.833 KB) | DOI: 10.30536/j.jsd.2007.v5.a660

Abstract

This paper is mainly concentrated to the correlation between Total Precipitable Water (TPW) on one single column of the vertical air mass and radar reflectivity (Z) over Kototabang (0.2˚S; 100.32˚E), Bukittinggi, West Sumatera based on to the analysis of Radio Acoustic Sounding System (RASS) and Boundary Layer Radar (BLR) data during the Coupling Processes of Equatorial Atmosphere (CPEA) Campaign I from April 10 to May 9, 2004 was going on. wWe firstly reviewed yhe basic concept of TPW using the Weisner method ti estimate the TPW value from the radiosonde data. We reviewed the basic concpt of RASS and BLR system also, especially on the Z data analysis. By arranging the mean value of RASS data every 10 minutes and 150 meter in height, respectively, we estimated the TPW values from the RASS data. By analysing the Cross Cirrelation Function (CCF) of both values taken from SPSS software version 13, we found a good agreement between TPW and Z parameter, especially on 5 May 2004. The correlation values are 0.05, and 0.61 at around 2.7 and 2.25 km, repectively. Although, the maximum correlation value in only 0.61, but this is still good enough to describe the correlation between TPW and Z.
Front Pages JSD Vol 13 No 2 Juni 2016 Sains Dirgantara, Redaksi Jurnal
Jurnal Sains Dirgantara Vol. 13 No. 2 Juni 2016
Publisher : Lembaga Penerbangan dan Antariksa Nasional

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Front Pages JSD Vol 13 No 2 Juni 2016
ANALISIS SEMBURAN RADIO MATAHARI TIPE II SEBAGAI PREKURSOR KEMUNGKINAN TERJADINYA BADAI MAGNET BUMI Suratno, -; Sulistiani, Santi
Jurnal Sains Dirgantara Vol 7, No.2 Juni (2010)
Publisher : Lembaga Penerbangan dan Antariksa Nasional

Show Abstract | Original Source | Check in Google Scholar | 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
STOCHASTIC PROCESS IN THE TIME SERIES MODEL OF PACIFIC DECADAL OSCILLATION (PDO) Lubis, Sandro Wellyanto
Jurnal Sains Dirgantara Vol 9, No. 1 Desember (2011)
Publisher : Lembaga Penerbangan dan Antariksa Nasional

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Abstract

Pacific Decadal Oscillation (PDO) is long-lived El Niño-like pattern of Pacific climate variability generated by coupled ocean-atmosphere interaction in the Northern Pacific Ocean. The best way to acquire a signal of PDO evidence is by determining the index of PDO. In this study, the PDO indexes are accurately modeled with time series methods through exponential smoothing analysis (Single and Holts Double exponential smoothing model) and Box-Jenkins analysis (ARIMA {1,1,1}, {2,1,1}. {3,1,1} and {4,1,1}). Nicholas’s PDO Model (ARMA 9, 7) is also considered as comparative model in order to obtain the level of the reliability models that have been produced. The best selected prediction model that close to the real PDO index is ARIMA (2,1,1) Zt = 1.574* Zt-1 -0.427* Zt-2 -0.147* Zt-3 -0.976* at-1 which means the forecast of PDO in the future depending on three months earlier data and a month earlier error of PDO index. Mean absolute error (MAE) of this model is 0.5283 and with root mean square error (RMSE) 0.6661. The predicted and observed PDO indexes are significantly correlated with r =0.76. Keywords: PDO, Box-Jenkins analysis, Exponential smoothing analysis 
ANALISIS FRAKTAL EMISI SINYAL ULF DAN KAITANNYA DENGAN GEMPA BUMI DI INDONESIA Saroso, Sarmoko
Jurnal Sains Dirgantara Vol 6, No.1 Desember (2008)
Publisher : Lembaga Penerbangan dan Antariksa Nasional

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Abstract

Anomali sinyal ULF pada variasi medan geomagnet merupakan salah satu fenomena yang diyakini kebenarannya dalam studi elektromagnetik yang berhubungan dengan kejadian gempa bumi, seperti terjadinya emisi dari kerak bumi yang berasal dari sumber gempa. Dari studi terdahulu telah banyak ditemukan pertanda anomali sinyal ULF sebelum kejadian gempa bumi berskala besar. Untuk membuktikan kebenaran fenomena tersebut dan untuk menjelaskan hubungan antara fenomena elektromagnetik dan mekanisme fisis yang mungkin terkait, telah dilakukan analisis data geomagnet di Kototabang yang berhubungan dengan kejadian gempa Sumatera. Studi kasus dilakukan untuk mengamati anomali sinyal ULF yang berhubungan dengan gempa Aceh yang terjadi pada tanggal 26 Desember 2004 dan gempa Nias yang terjadi pada tanggal 28 Maret 2005 dengan menggunakan metode analisis fraktal. Dalam analisis fraktal, penentuan anomali emisi sinyal ULF dilakukan dengan menghitung dimensi fraktal dari deret waktu ULF. Untuk menentukan dimensi fraktal digunakan metode Jurnal Sains Dirgantara Vol. 6 No. 1 Desember 2008:39-46 40 Higuchi karena dimensi fraktal yang dihitung dengan metode ini lebih stabil dibandingkan dengan metode lainnya. Hasil yang diperoleh menunjukkan terjadinya penurunan dimensi fraktal 1 bulan hingga beberapa minggu sebelum kejadian gempa besar tersebut. Hal ini merupakan indikasi dari fase awal terjadinya peningkatan aktivitas seismik yang kemungkinan terkait dengan variasi geomagnet yang diakibatkan oleh aktivitas lokal yang berasal dari litosfer yang dipicu oleh kejadian gempa bumi di Aceh dan Nias. Kata kunci : Anomali sinyal ULF, Dimensi fraktal, Aktivitas seismik
PROYEKSI DEBIT ALIRAN PERMUKAAN DAS CITARUM BERBASIS LUARAN MODEL ATMOSFER Berliana Sipayung, Sinta; Cholianawati, Nani
Jurnal Sains Dirgantara Vol 8, No.2 Juni (2011)
Publisher : Lembaga Penerbangan dan Antariksa Nasional

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Abstract

 Rainfall variability has an impact on the amount of water balance in each watershed (catchment) scale of space and time, so that rainfall variability has an important role to discharge runoff. As the main input is not only rainfall, but the level of land cover and soil physical properties with various concepts was an important input in maintaining the equilibrium amount of water in a watershed, resulting in an equilibrium water balance, and surface flow is considered as a likely output for the sector needs. The data used is the GCM model outputs Geophysical Fluid Dynamics Laboratory (GFDL) in units of rainfall (mm) are reduced from global to local scale. Besides the rainfall data (mm) taken from the Tropical Rainfall Measuring Mission (TRMM, 3B43) satellite with a resolution of 0.25 degrees (equivalent to 27.5 km2), temperature (0C) from the Moderate Resolution Imaging Spectroradiometer (MODIS) level with a resolution of 0.045 degrees (equivalent to 5 km2). Similarly, observational data of rainfall, surface temperature and flow rate (mm3/sec) from 2001 to 2009 are used to validate satellite data and atmospheric models. The correlation between rainfall observations, satellite and atmospheric model outputs are 0.76 and 0.65, respectively. By using the method of Hydrological Simulation Model (HYSIM) can be determined projections of future surface flow atmospheric model based on the DAS Citarum, West Java. Based on the flow rates calculation and observations from 2001 to 2009, have suitability with correlation coefficient of 0.8. The results of calibration flow rate projections from 2011 to 2019 is following the pattern of previous years with a correlation of 0.6. Flow rate is affected by rainfall in the region. Based on the rainfall projections, it is known that rainfall increases with increasing rainfall, the availability of water even more, so that the flow at the surface of the Citarum river basin is expected to increase. Keywords:DAS Citarum, HYSIM, Climate, Satellite, and Atmospheric model
POPULASI SAMPAH ANTARIKSA MENJELANG PUNCAK AKTIFITAS MATAHARI SIKLUS 24 [SPACE DEBRIS POPULATION TOWARD THE PEAK OF SOLAR CYCLE 24 Rachman Hakim, Abdul
Jurnal Sains Dirgantara Vol. 10 No. 1 Desember 2012
Publisher : Lembaga Penerbangan dan Antariksa Nasional

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Abstract

Aktifitas Matahari mempengaruhi populasi sampah antariksa melalui dampaknya pada kerapatan atmosfer atas. Peningkatan aktifitas Matahari yang meningkatkan kerapatan atmosfer akan mengakibatkan jatuhnya benda-benda di orbit yang cukup rendah. Namun, dampak yang sama menyebabkan turunnya benda-benda di orbit yang lebih tinggi menggantikan posisi benda-benda yang telah jatuh. Dengan menganalisis data orbit benda-benda buatan dalam katalog USSPACECOM sejak Desember 2008 hingga Oktober 2012, ditemukan bahwa populasi sampah antariksa secara umum meningkat meski jumlah yang jatuh terus menerus bertambah. Rata-rata 2,7 sampah antariksa bertambah setiap hari sedang yang jatuh rata-rata hanya 1,1 setiap hari. Besarnya persentase sampah Fengyun 1C, Cosmos 2251, dan Iridium 33 yang masih mengorbit menjadi faktor utama peningkatan populasi tersebut. Selanjutnya, dengan memakai pendekatan teori gas kinetik dan distribusi Poisson, ditemukan peningkatan jumlah sampah secara kontinu untuk ketinggian antara 600 dan 700 km yakni di sekitar ketinggian satelit LAPAN-TUBSAT. Hasil perhitungan menunjukkan bahwa probabilitas tabrakan LAPAN-TUBSAT pada Oktober 2012 adalah 33,8% lebih tinggi dibanding probabilitasnya pada Desember 2008.Kata kunci: Aktifitas Matahari, Populasi sampah antariksa, Kerapatan atmosfer, LAPAN-TUBSAT, Probabilitas tabrakan

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