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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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ANALISIS VARIASI DIURNAL OZON DAN PRECURSORNYA PADA MUSIM KEMARAU DAN MUSIM HUJAN DI BANDUNG Afif Budiyono; Saipul Hamdi; Ninong Komala; - Sumaryati
Jurnal Sains Dirgantara Vol 7, No 1 (2009)
Publisher : Lembaga Penerbangan dan Antariksa Nasional

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Abstract

ATelah dilakukan pengukuran konsentrasi NOX (NO +NO2) dan CO ambien secara kontinyu sejak awal tahun 2008 di Bandung (06º, 54” S,-107º, 35” E, 762 m DPL). Pengukuran ini merupakan bagian dari program pengembangan kapasitas pemantauan kualitas udara ambien, sementara pengukuran konsentrasi ozon ambien telah dilakukan secara kontinyu sejak Jurnal Sains Dirgantara Vol. 7 No. 1 Desember 2009 : 165-175 166 tahun 1985. Analisis data ozon dan prekursornya, NOX (NO +NO2) serta CO tahun 2008 untuk musim kemarau dan musim hujan juga dilakukan. Diperoleh puncak konsentrasi variasi diurnal NOX dan CO terjadi pada pagi hari antara pukul 06.30-07.30 WIB, dan sore hari antara pukul 19.00-21.00 WIB, puncak konsentrasi ini menggambarkan karakter hubungan fotokimia proses pembentukan dan perusakan ozon. Secara berturut-turut diperoleh nilai konsentrasi rata-rata NOX, NO, NO2, CO dan O3, NOX: 19,23 ppbv, NO: 8,89 ppbv, NO2: 10,14 ppbv CO: 930 ppbv dan O3: 20,91 untuk musim kemarau dan NOX: 25,18 ppbv, NO: 11,35 ppbv, NO2: 13,81 ppb CO: 1104 ppbv and O3: 23,67 ppbv untuk musim hujan. Nilai maksimum konsentrasi O3 mencapai 54,65 ppbv pada pukul 12.00 WIB di musim kamarau dan 36,51 ppbv pada pukul 11.00 WIB di musim hujan, sementara nilai minimum konsentrasi terjadi pada awal pagi hari sebesar 9,24 ppbv pada pukul 05.00 WIB pagi untuk musim kamarau dan sebesar 11,7 ppbv pada pukul 01.00 WIB untuk musim hujan. Terjadinya peningkatan konsentrasi O3 sepanjang pagi hari bertepatan dengan penurunan konsentrasi NO karena proses fotolisis, sementara penurunan kosentrasi O3 pada sore hari kemungkinan merupakan hasil dari proses deposisi kering bersamaan dengan penurunan lapisan batas dan adanya tritrasi dengan NO, karena melemahnya proses photokimia sepanjang sore hari. Diperoleh nilai background konsentrasi CO terhadap NOX pada musim kemarau sebesar 219,74 ppbv, sementara nilai background konsentrasi CO pada musim hujan sebesar 176,86 ppbv, dengan koefisien korelasi lebih besar dari 90 % untuk kedua musim baik musim kemarau maupun musim hujan. Kata Kunci: Ozon, Precursor ozon, Variasi diurnal, Laju fotolisis, Fotokimia.
PENENTUAN ONSET MONSUN DI WILAYAH INDO-AUSTRALIA BERDASARKAN LOMPATAN ITCZ Didi Satiadi; Ibnu Fathrio
Jurnal Sains Dirgantara Vol 9, No 1 (2011)
Publisher : Lembaga Penerbangan dan Antariksa Nasional

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Abstract

Inter-Tropical Convergence Zone (ITCZ) is one of the factors affecting weather and climate in the Indonesia Maritime-Continent Region together with El-Niño Southern Oscillation (ENSO), Indian Ocean Dipole Mode (IODM), Madden Julian Oscillation (MJO), Tropical Cyclone (TC), and Monsoon. ITCZ influence weather and climate in the Indonesia region. Therefore, monitoring and understanding ITCZ behaviour become important as an alternative method to predict variability, anomaly, and extreme atmospheric conditions in Indonesia region. Research has been conducted to study the behaviour of ITCZ in the Indonesia maritime-continent region using Multi-Functional Transport Satellite (MTSAT) data from year 2006 to 2009. Identification of ITCZ and its movement was carried out based on minimum cloud top temperature observed by MTSAT satellite. Meridional movement of ITCZ were then compared to the Indo-Australia Monsoon Indices and rainfall from Tropical Rainfall Measuring Mission (TRMM) satellite. The results showed that ITCZ positions tend to exist at certain locations and experienced jumps to mid-latitude during seasonal change to dry and wet seasons. The results can be used to predict monsoon onset in the Indo-Australia region based on ITCZ jumps, and also to verify rainfall prediction models which in turn can be applied to hydrological models, environtmental models, and rainfall-related disaster early warning systems. Keywords: ITCZ, Monsoon, Onset, Satellite, Indonesia
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
PENGAMATAN OPTIK SATELIT LEO: ANALISIS FOTOMETRI [OPTICAL OBSERVATION OF LEO SATELLITES: PHOTOMETRY ANALYSIS] Rhorom Priyatikanto; Abdul Rachman; Tiar Dani
Jurnal Sains Dirgantara Vol 12, No 2 (2015)
Publisher : Lembaga Penerbangan dan Antariksa Nasional

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Abstract

Pengamatan benda antariksa pada orbit rendah dapat dilakukan pada jendela optik. Sistempengamatan menggunakan kamera dijital dengan lensa teleskopik telah dikembangkan oleh PusatSains Antariksa LAPAN. Lebih dari seratus bingkai citra medan lebar telah dihasilkan dalampengamatan yang dilakukan pada Agustus 2014. Dalam makalah ini, dipilih sepuluh citra yangmengandung jejak satelit untuk analisis fotometri. Skema analisis fotometri yang terdiri ataspemodelan langit latar belakang, identifikasi jejak, serta ekstraksi fluks diterapkan pada citra hinggamenghasilkan sepuluh kurva cahaya dari empat obyek antariksa yang diamati, yakni ISS, H-2A RB,Titan-4B RB, dan TRMM. Variabilitas fluks tampak dalam kurva cahaya tersebut, tetapi tidak cukupsignikan untuk dianggap sebagai perubahan kecerlangan obyek sebagai akibat dari perubahansikapnya (misalnya tumbling). Meski demikian, studi ini menunjukkan keberhasilan skema analisisfotometri yang telah dikembangkan sebagai bagian dari sistem pemantauan benda antariksa.Kata Kunci: Benda orbital, Analisis data, Fotometri
ANALISIS ORBIT SATELIT GSO Abd. Rachman; - Neflia
Jurnal Sains Dirgantara Vol 5, No.1 Desember (2007)
Publisher : Lembaga Penerbangan dan Antariksa Nasional

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Abstract

Analysis of GSO satellite has done by using data from 57 satellite. It contains analysis on distortion of satellite's orbit due to perturbation forces and analysis on the station keeping maneuvers which have been done to keep the orbit on its ideal condition. Result of the analysis shows that it is not always a satellite located near the stable points (76˚E dan 252.4˚E) will oscillate about that longitudes. Ten among the post-operational satellite do oscillate about the stable points but the rest of them drift their longitudes from 0 to 360˚. The analysis also shows that orbital prediction using SDP4 model con only be accurate for prediction of inclination. Prediction of longitude, semimajor axis, and period based on TLE data are very sensitive to the related TLE.
ANALISIS PENGARUH PENETRASI MEDAN LISTRIK LINTANG TINGGI KE LINTANG RENDAH TERHADAP IONOSFER SAAT BADAI GEOMAGNET (ANALYSIS OF THE ELECTRIC FIELD PENETRATION EFFECT FROM HIGH TO LOW LATITUDES ON THE IONOSPHERE DURING GEOMAGNETIC STORM) Anwar Santoso; Dadang Nurmali; Mira Juangsih; Iyus Edi Rusnadi; Sri Ekawati; Anton Winarko; Siska Filawati
Jurnal Sains Dirgantara Vol 14, No 2 (2017)
Publisher : Lembaga Penerbangan dan Antariksa Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (151.831 KB) | DOI: 10.30536/j.jsd.2017.v14.a2368

Abstract

The influence of geomagnetic storms on the ionosphere in the equatorial and low latitudes can be either rising or falling value of the value foF2 with the different response delay time. The difference in response is one of them allegedly influenced by the modification of Equatorial Electrojet (EEJ) generated by the penetration of high latitude electric field towards the low latitude electric field and the equator. Therefore, this paper analyzes the influence of the high latitude penetration of electric current to the low latitude electric current towards the ionosphere response to Indonesia's current geomagnetic storms using the data foF2 BPAA Sumedang (SMD; 6,910 S; 106,830E geographic coordinates or 16,550 S; 179,950 E magnetic coordinates) and data from the Biak geomagnetic field station (BIK; 1,080 S; 136,050 E geographic coordinates or  9,730 S; 207,390 E magnetic coordinates) in 2000-2001. The result showed that the injection of the electric field of the high latitudes to lower latitudes causing foF2 BPAA Sumedang to be disturbed. Onset of the foF2 disturbance in BPAA Sumedang started coincide with EEJ(HBIK-HDRW) and reached its minimum point with a time delay between 0 to 4 hours before and after Dst index reached the minimum point. For a delay time of 0 to 4 hours after the Dst index reached the minimum point, the results were in accordance with the research results from the prior research. However, for the time difference of between 0 to 4 hours before the Dst index reached the minimum point, the results differ from their results. AbstrakPengaruh badai geomagnet terhadap ionosfer di ekuator dan lintang rendah berupa naiknya nilai foF2 atau turunnya nilai foF2 dengan waktu tunda respon berbeda-beda. Perbedaan respon tersebut salah satunya diduga dipengaruhi oleh modifikasi Equatorial electrojet (EEJ) yang dihasilkan oleh penetrasi medan listrik lintang tinggi sampai daerah lintang rendah dan ekuator. Oleh karena itu, dalam makalah ini dilakukan analisis pengaruh penetrasi arus listrik lintang tinggi ke lintang rendah terhadap ionosfer saat badai geomagnet menggunakan data foF2 dari Balai Pengamatan Antariksa dan Atmosfer (BPAA) Sumedang (SMD; 6,910 LS; 106,830 BT koordinat geografis atau 16,550 LS; 179,950 BT koordinat magnet) dan data medan geomagnet dari stasiun Biak (BIK; 1,080 LS; 136,050 BT koordinat geografis atau 9,730 LS; 207,390 BT koordinat magnet) tahun 2000-2001. Hasilnya diperoleh bahwa penetrasi medan listrik dari lintang tinggi ke lintang lebih rendah Indonesia menyebabkan foF2 BPAA Sumedang terganggu. Onset gangguan foF2 BPAA Sumedang mulai terjadi bertepatan dengan EEJ(HBIK-HDRW) mencapai titik minimumnya dengan jeda waktu antara 0 sampai 4 jam sebelum dan sesudah indeks Dst mencapai minimum. Untuk beda waktu 0 sampai 4 jam sesudah indeks Dst mencapai minimum, hasilnya bersesuaian dengan hasil penelitian peneliti sebelumnya. Namun, untuk beda waktu 0 sampai 4 jam sebelum indeks Dst mencapai minimum, hasilnya merupakan temuan berbeda dari hasil mereka.
IDENTIFIKASI PENGARUH AKTIVITAS MATAHARI PADA FOF2 DI BIAK DAN TEC IONOSFER DI BANDUNG Wilsom Sinambela; Anwar Santoso; - Asnawi
Jurnal Sains Dirgantara Vol 2, No.1 Desember (2004)
Publisher : Lembaga Penerbangan dan Antariksa Nasional

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Abstract

The identification of solar activity effets on ionospheric layer has been investigated based on data of monthly mean of critical frequency of ionospheric layer F2 (foF2) over Biak during the period 1991-1995, and data Total Electron Content (TEC) over Bandung during the period 1997-2000. Data of daily TEC over Bandung were used for identification of ionospheric storms due to large solar flares that occurred on September 23, 1998 and July 14, 2000 that followed by Coronal Mass Ejection (CME) event. From analysis it was found that solar activities such as sunspot and solar flare influences the ionospheric layer both short-term and long-term. By taking the moving average of 12 months and using linier regression analysis it was found that the variation of ionospheric foF2 and TEC following the variation of solar activity indices; the decreasing of solar activity during the descending phase of solar cycle-22 (1991-1995) is followed by the decreasing of ionospheric foF2 over Biak, with strong correlation coefficient of 0.96; the increasing of solar activity during the ascending phase of solar cycle-23 (1997-2000) is followed by the increasing of ionospheric TEC over Bandung, with strong correlation coefficient of 0.98. From identification of the large solar flares effects that occurred on September 23, 1998 and July 14, 2000 that followed by CME event causes the ionospheric storm about 2-days after solar flare. From identification also it seems that small solar flares no causes ionospheric storm in these period.
ANALISIS PENGARUH AEROSOL PADA AWAN DI INDONESIA [AEROSOL IMPACT ON CLOUDS ANALYSIS OVER INDONESIA] Indah Susanti; - Rosida; Laras Tursilowati; Nani Cholianawati
Jurnal Sains Dirgantara Vol 12, No 1 (2014)
Publisher : Lembaga Penerbangan dan Antariksa Nasional

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Abstract

Tulisan ini menguraikan penggunaan data Moderate Resolution Imaging Spectroradiometer (MODIS) level-2 pada satelit Terra MOD08 versi 5.1 untuk mempelajari pengaruh peningkatan fluks aerosol yang dinyatakan dengan parameter Aerosol Optical Depth (AOD) pada ukuran radius efektif awan cair dan awan es, pada fraksi awan dan pada tekanan puncak awan atau Cloud Top Pressure (CTP) di atas Indonesia. Data dikelompokkan untuk musim hujan (Desember, Januari, Februari atau DJF), periode transisi 1 (Maret, April, Mei atau MAM), musim kering (Juni, Juli, Agustus atau JJA) dan periode transisi 2 (September, Oktober, November atau SON) di atas wilayah yang meliputi 80 º-150 ºBT dan 12 ºS-12 ºLU untuk periode Maret 2000 – Februari 2012. Pengaruh tidak langsung yang bersifat positif dari aerosol di atas Indonesia pada ukuran radius efektif awan lebih terlihat pada awan cair dibandingkan pada awan es. Pengaruh positif aerosol pada radius efektif awan es terjadi di atas daratan Kalimantan, Sumatera, dan sebagian Jawa untuk semua periode, dengan pengaruh terkuat pada periode MAM dan SON di Kalimantan. Pengaruh negatif untuk awan es cenderung terjadi di atas lautan dan daerah-daerah dengan nilai AOD di bawah 0,3. Pengaruh positif aerosol pada radius efektif awan cair jelas terlihat pada periode MAM dan SON. Sedangkan untuk wilayah-wilayah dengan nilai rata-rata AOD yang tinggi (di atas 1) terlihat di sebagian Sumatera dan sebagian Kalimantan, peningkatan fluks aerosol menyebabkan peningkatan fraksi awan. Pengaruh peningkatan fluks aerosol di Indonesia cenderung meningkatkan nilai tekanan pada puncak awan, yang berarti membantu pembentukan awan-awan rendah.Kata kunci: Aerosol, Fraksi awan, MODIS, Terra
The use of satellite beacon TEC data from GRBR campaign-based observations for ionosphere tomography over West Java Indonesia Timbul Manik
Jurnal Sains Dirgantara Vol 15, No 2 (2018)
Publisher : Lembaga Penerbangan dan Antariksa Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1526.662 KB) | DOI: 10.30536/j.jsd.2018.v15.a2896

Abstract

The experiment of ionospheric tomographic reconstruction using satellite beacon TEC data from two or more adjacent GRBR observation stations following equatorial latitude and longitude have been conducted on campaign-based  observation in Sumedang, Pameungpeuk and Indramayu West Java on 2016 and 2017. The reconstruction technique utilized is a simple algebraic reconstruction technique (ART). The result obtained is the ionosphere electron density distribution along the longitude of 108 degrees East over the area of West Java and Indonesia. The ionosphere electron density  parameters obtained from the IRI-2012 Model were used as the initiation to construct ionospheric tomographic reconstruction. The validation performed by correlating foF2 from the ionospheric tomographic reconstruction with foF2 obtained from ionosonde observation at Sumedang station, one of the GRBR observation sites shows that corresponded to the correlation coefficient value of 0.8665, with a bias frequency of 1.386 MHz, whereas the correlation with the maximum electron density value obtained from the IRI-2016 model gives a  correlation coefficient value of 0.8958. a bias frequency of 1.386 MHz, whereas the correlation with the maximum electron density value obtained from the IRI-2016 model gives a  correlation coefficient value of 0.8958.  
MODEL PELURUHAN DAN REENTRI ORBIT SATELIT LEO S.L. Manarung; Wlson Sinambela; Abd. Rachman
Jurnal Sains Dirgantara Vol 5, No.1 Desember (2007)
Publisher : Lembaga Penerbangan dan Antariksa Nasional

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Abstract

Based to the non-central Earth's gravity causing the sekuler variation on the semi mayor axis and ecentricity of the LEO's satellite the software of orbital decay has been developed. The input for the software is the height, eccentricity existed in TLE (Two Line Elemen table), anapproximated ballistic coefficient and the atmospheric density on virous solar activity. The software has been used to predict the time is to 10%, and the error will become smaller if the software is executed closed to reentry time such a week before satellite reentry. The softaware can be used to approximate the ballistic coefficient of a satellite.

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