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INDONESIA
Jurnal Sains Dirgantara
Published by Lembaga Penerbangan dan Antariksa Nasional
ISSN : -     EISSN : -     DOI : -
Core Subject : Education,
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Articles 210 Documents
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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
PERBANDINGAN foF2 KELUARAN MSILRI DENGAN DATA OBSERVASI DI BIAK, MODEL IRI DAN ASAPS [THE COMPARISON OF foF2 OUTPUT OF MSILRI TO BIAK OBSERVATION DATA, IRI MODEL AND ASAPS] Sri Suhartini; Irvan Fajar Syidik; Dadang Nurmali
Jurnal Sains Dirgantara Vol 12, No 2 (2015)
Publisher : Lembaga Penerbangan dan Antariksa Nasional

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Abstract

Model Sederhana Ionosfer Lintang Rendah Indonesia (MSILRI) adalah model ionosfer untukwilayah Indonesia dan sekitarnya. Model ini pertama kali dikembangkan pada 2002, dan sampai saatini terus direvisi dan dikembangkan. Frekuensi kritis lapisan F2 ionosfer (foF2) keluaran modelMSILRI2013 telah dibandingkan dengan hasil observasi di Biak 2005 sampai 2009, keluaran modelASAPS versi 6.2 dan IRI2012. Hasilnya menunjukkan bahwa pola keluaran MSILRI2013 sesuaidengan hasil observasi. Persentase selisih foF2 (model-observasi) terhadap hasil observasi{foF2(model-observasi)/observasi} 2005, 2009, dan 2013 untuk ketiga model menunjukkan bahwauntuk tahun yang sama sebaran nilainya hampir sama. Pada 2009 sebaran persentase terbanyakantara -40% - +20%, 2005 dan 2013 antara -20% - +20%. Model MSILRI2013, ASAPS V6.2, dan IRI2012 mempunyai akurasi cukup tinggi pada kondisi aktivitas matahari sedang. Akurasi terendahuntuk MSILRI2013 dan ASAPS V6.2 terjadi pada saat aktivitas matahari sekitar minimum (2009).Meskipun Model MSILRI menunjukkan karakteristik perbedaan antara model dengan hasil observasi paling konsisten dibandingkan kedua model lainnya, namun korelasi antara foF2 keluaran MSILRI dengan data paling rendah dibandingkan kedua model lainnya. Oleh karena itu model MSILRI masihdiperlukan disempurnakan, baik metode pemodelannya maupun penambahan stasiun dan tahun data hasil pengamatan ionosfer IndonesiaKata kunci: Model ionosfer, foF2, MSILRI2013, ASAPS V6.2, IRI2012.
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.
Front Pages JSD Vol 14 No 2 Juni 2017 Redaksi Jurnal
Jurnal Sains Dirgantara Vol 14, No 2 (2017)
Publisher : Lembaga Penerbangan dan Antariksa Nasional

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Abstract

Front Pages JSD Vol 14 No 2 Juni 2017
PEMODELAN TLCL DAN TCCL UNTUK KOTA BANDUNG DENGAN MENGGUNAKAN METODE SKEW-T PLOTTING Toni Samiaji
Jurnal Sains Dirgantara Vol 2, No.1 Desember (2004)
Publisher : Lembaga Penerbangan dan Antariksa Nasional

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Abstract

Simple model has been made to predict temperature of LCL and CCL based on surface on surface dew point data. The method which used is skew-T plotting, i.e. plotting temperature and dew point profile of radiosonde data on aerogram paper. The data which used is radiosonde sounding data of Bandung in 1992, 1995, 1997 and 1999. Model formula which obtained has linear form, when surface dew point straight proportional to LCL and CCL temperature. CCL and LCL temparature modelling based on surface humidity data has been made natural logarithmic of surface humidity. LCL temperature has good correlations to CCL temperature, and generally form linear and straight proportional.
EFEK PARAMETERISASI LAPISAN BATAS ATMOSFER TERHADAP PEMBENTUKAN GELOMBANG GRAVITAS DI SUMATERA BARAT [THE EFFECT OF ATMOSPHERIC BOUNDARY LAYER PARAMETERIZATION TO THE GENERATION OF GRAVITY WAVES OVER WEST SUMATERA] Dyah Ayu Putriningrum; Nurjanna Joko Trilaksono; - Noersomadi
Jurnal Sains Dirgantara Vol 12, No 1 (2014)
Publisher : Lembaga Penerbangan dan Antariksa Nasional

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Abstract

Gelombang gravitas berperan dalam sirkulasi dinamika atmosfer dan mempengaruhi proses-proses di Lapisan Batas Atmosfer (LBA). Gelombang gravitas telah diidentifikasi dengan simulasi temperatur potensial dan kecepatan angin menggunakan model Weather Research and Forecasting–Advance Research WRF (WRF-ARW) dengan kondisi inisial dan kondisi batas model dari data final analyses (FNL) tanggal 16–17 Maret 2008. Simulasi dilakukan dalam tiga domain nested (bersarang) dengan resolusi horizontal paling tinggi sebesar 3 km. Metode simulasi dilakukan dengan membandingkan dua skema parameterisasi LBA yang berbeda yakni Medium Range Forecast (MRF) dan Yonsei University (YSU). Metode analisis menggunakan transformasi Fourier dan wavelet. Dari hasil simulasi, gelombang gravitas berhasil diidentifikasi dengan baik menggunakan skema MRF di atas Sumatera Barat saat aktivitas konveksi sedang terjadi dengan nilai Cloud Water Mixing Ratio (CWMR) sekitar 0,1-2,1 g/kg. Ciri-ciri gelombang gravitas yang terdeteksi merupakan gelombang gravitas berperiode singkat (~2 jam) dengan panjang gelombang horizontalnya 5–50 km. Perbedaan karakter gelombang gravitas yang dihasilkan simulasi, berhubungan dengan sensitivitas skema parameterisasi LBA dan resolusi grid horizontal. Gelombang gravitas dapat disimulasikan oleh skema MRF dengan resolusi horizontal 3 km yang dapat menghasilkan panjang gelombang yang lebih pendek.Kata kunci: Gelombang gravitas, Lapisan Batas Atmosfer, WRF-ARW, Parameterisasi
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.
THE POSSIBILITY OF UTILIZATION OF THE EQUATORIAL ATMOSPHERE RADAR (EAR) ON STUDY THE EFFECT OF GRAVITY WAVES ON A CORRUGATED STRUCTURE OF REFLECTION SURFACE Eddy Hermawan
Jurnal Sains Dirgantara Vol 2, No.2 Juni (2005)
Publisher : Lembaga Penerbangan dan Antariksa Nasional

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Abstract

We have introduced a new Aquatorial Atmosphere Radar (EAR), a collaboration project between Research Institude for Sustainable Humanosphere (RISH), Kyoto University, Japan and the Indonesian Natioanal Institute of Aeronautics and Space (LAPAN) at Kototabang, Bukittinggi, West Sumatera. This radar is mainly concerned to observe winds and turbulence in the troposphere and lower stratosphere with a good time the EAR are still developing. In this paper, one possibility an application of EAR on study effects of gravity waves on a corrugated surface is discussed. For the referance, we investigated the azimuth angle variations of clear air echoes in the troposphere and lower stratosphere by using the MU (Middle and Upper Atmosphere) radar in Shigaraki, Japan (34˚51’N; 136˚06’E). We used a data set collected on November 4-5, 1986 by steering the antenna beam into 12 oblique positions at the same zineth angle of 6˚ and the azimuth angle being changed every 30˚. We have detected considerable amplitudes in the azimuth angle variations of echo power, which was continuous along altitude. We also found time evolution of the azimuth angle variations of echo power. The observed azimuth angle variations of echo power suggest that the reflection surface is affected by propagating gravity wave. As a preminary result, we present characteristics of zonal and meridional wind velocity observed with EAR on May 24-25, 2001 over Kototabang after observations of the variations of meridional wind velocity from September to December 2001 as one of the most important parameter needed to explain the mechanism of gravity waves is also discussed.
KARAKTERISTIK INDEKS IONOSFER (INDEKS_T) JAM-AN DAN BULANAN SUMEDANG DAN BIAK [SUMEDANG AND BIAK HOURLY AND MONTHLY IONOSPHERIC INDEX (T INDEX) CHARACTERISTICS] Sri Suhartini; Irvan Fajar Syidik; Slamet Syamsudin
Jurnal Sains Dirgantara Vol 11, No 2 (2014)
Publisher : Lembaga Penerbangan dan Antariksa Nasional

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Abstract

Salah satu masukan untuk perangkat lunak Advance Stand Alone Prediction System (ASAPS) yang digunakan untuk menyiapkan layanan prediksi frekuensi komunikasi radio HF oleh Lapan adalah indeks ionosfer (indeks_T), yaitu indeks yang menyatakan ukuran efek aktivitas matahari pada ionosfer. Dalam kondisi tertentu pengguna komunikasi radio HF memerlukan prediksi frekuensi jangka pendek, dan untuk itu diperlukan informasi indeks_T jam-an. Makalah ini membahas penerapan metode Turner untuk penentuan indeks Ionosfer (Indeks_T) lokal jam-an menggunakan data foF2 dari Loka Pengamat Dirgantara Sumedang (6,54 ⁰LS, 107,55 ⁰BT) tahun 1998 – 2012 dan Biak (1,38 ⁰LS, 135,98 ⁰BT) tahun 2005 – 2012 dan bilangan sunspot (R12).  Hasil perhitungan menunjukkan bahwa Indeks_T jam-an Sumedang dan Biak mengikuti variasi aktivitas matahari jangka panjang, namun tidak nampak variasi musiman maupun hariannya. Analisis menunjukkan bahwa indeks_T jam-an harus dihitung secara terpisah untuk masing-masing lokasi. Indeks_T bulanan lokal di Sumedang dan Biak mengikuti karakteristik indeks_T global dan aktivitas matahari jangka panjang dan secara umum nilainya lebih tinggi dibandingkan dengan indeks_T global. Untuk indeks_T regional bulanan Indonesia dapat digunakan satu nilai indeks_T regional, yaitu rata-rata indeks_T lokal bulanan.Kata kunci: Indeks ionosfer, Metode Turner, Indeks_T jam-an, Indeks_T bulanan
PENGARUH ORIENTASI MEDAN MAGNET ANTARPLANET PADA GANGGUAN GEOMAGNET DI LINTANG RENDAH (THE EFFECT OF INTERPLANETARY MAGNETIC FIELD ORIENTATION ON LOW LATITUDE GEOMAGNETIC DISTURBANCES) Anton Winarko; Anwar Santoso
Jurnal Sains Dirgantara Vol 13, No 2 (2016)
Publisher : Lembaga Penerbangan dan Antariksa Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1657.824 KB) | DOI: 10.30536/j.jsd.2016.v13.a2938

Abstract

Interplanetary Magnetic Field (IMF) is a part of the Solar magnetic field that is carried into interplanetary space by the solar wind. Based on previous study it is known that solar wind condition when reconnection occurs has important role on geomagnetic disturbance. This paper discusses lowlatitude geomagnetic field responses to various condition of reconnection, i.e. when north-south component of Interplanetary Magnetic Field (IMF Bz) was south-directed (<0) in long duration, IMF Bz switch to opposite direction after reconnection, and neutral IMF Bz (~0). Case studies show that precondition which IMF Bz<0 prompt more intense geomagnetic storm compared to IMF Bz ~0. At low latitude, precondition of IMF Bz <0 tend to trigger disturbance in the form of geomagnetic storm, while the IMF Bz~0 one could trigger Sudden Impulse. Change of IMF Bz direction after reconnection affected recovery phase acceleration, that was on IMF Bz>0, recovery phase took less time compared to IMF Bz<0. ABSTRAKMedan magnet antarplanet (Interplanetary Magnetic Field/IMF) adalah medan magnet matahari yang dibawa oleh angin surya dan menjalar dalam ruang antarplanet. Berdasarkan studi sebelumnya diketahui bahwa kondisi angin surya saat terjadi rekoneksi amat berpengaruh terhadap gangguan geomagnet yang terjadi. Pada makalah ini dibahas respons medan geomagnet di lintang rendah pada berbagai kondisi rekoneksi yaitu pada saat komponen utara-selatan medan magnet antarplanet (IMF Bz) dominan selatan (IMF Bz<0) dalam durasi panjang, IMF Bz berbalik arah setelah rekoneksi, dan IMF Bz cenderung netral (IMF Bz~0). Dari studi kasus menunjukkan bahwa prakondisi IMF Bz <0 mengakibatkan badai geomagnet yang lebih intens dibandingkan IMF Bz~0. Di lintang rendah, prakondisi IMF Bz<0 cenderung mengakibatkan gangguan berupa badai geomagnet sedangkan IMF Bz~0 dapat memicu Sudden Impulse. Perubahan arah IMF Bz yang terjadi setelah rekoneksi mempengaruhi laju fase pemulihan (recovery phase), yaitu pada IMF Bz>0, fase pemulihannya cenderung berlangsung lebih cepat dibandingkan saat IMF Bz<0.

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