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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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KETERKAITAN AKTIVITAS MATAHARI DENGAN SUHU PERMUKAAN LAUT ( SEA SURFACE TEMPERATURE/SST) DAN ENSO DI ATAS INDONESIA Wilson Sinambela; Tiar Dani; Iyus E. Rusnadi
Jurnal Sains Dirgantara Vol 4, No 2 (2007)
Publisher : Lembaga Penerbangan dan Antariksa Nasional

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Abstract

This paper present the relationships between long-term solar activities and sea surface temperature (SST) anomalies over Indonesian regions. Analysis on the relatioships between these parameters is carried out by using wavelet-base analysis techniques and correlation analysis. The wavalet Transform-base analysis (WWZ) for SST anomaly time series are gouped for overall Indonesian SST (SSTI), Western Indonesia SST (SST KIB), Middel Indonesian (SST KITeng) and Eastern Indonesian SST (SST KIT). And also grouped by season, dry season (JJA) and wet season (DJF) during the period of 1860-2005. The WWZ result for SST anomaly time series over Indonesia show some long period main signals with periods of 83 year, (50, 33, 25) year, (9-13) year which are suspected to be associated with solar activity sycles of 80-110 year (Gleissberg cycle), 50 year (interdecadal cycle), 22 year (cycle Hale) and 11-year of solar activity. There are also appear some signals with shorter periods of (3-7) year, (1.5-2.7) year, and (0.5-1) year which are suspected to be associated with ENSO, QBO, and seasonal / annual effects, respectively. From the result of long-term correlation analysis between solar activities with solar cycle length indicator and the 11 and 22 year running moving average Indonesian SST anomalies show good correlation for all data group. While the SST over KIT shows a negative correlation, but during of 1950-2005 shows s positive correlation.
DINAMIKA LAPISAN STRATOSFER DI BELAHAN BUMI UTARA DAN DAMPAKNYA TERHADAP WILAYAH TROPIS: STUDI KASUS MUSIM DINGIN 2012-2013 (STRATOSPHERIC DYNAMICS IN THE NORTHERN HEMISPHERE AND ITS IMPACT TO THE TROPICS: A CASE STUDY OF 2012-2013 WINTER) nFN Noersomadi
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 (1285.914 KB) | DOI: 10.30536/j.jsd.2017.v15.a2638

Abstract

This research aims to investigate the dynamic of static stability (N2), potential energy of gravity waves (Ep), and vortex in the stratospheric northern hemisphere during 2012-2013 winter using temperature (T) and zonal wind (u) data from NCEP-DOE Reanalysis II. The results showed two occurrences of decreasing N2 ascociated with reversal of u in the first and third week of December 2012 were believed as a trigger of Sudden Stratospheric Warmings (SSW) on January 7, 2013. There was a flow from the polar to the tropics region during the SSW event. It caused the tropopause folding in the sub-tropic region indicated by the distribution of Ep on January 24, 2013. This tropopause folding triggered the convective activity over the Indonesian continents as shown by the negative OLR anomaly from 22 to 26 January 2013. The impact of SSW event in the northern hemisphere to the convective activity was 20%. This results showed the interaction between stratosphere and troposphere and also the teleconnection between the polar and the tropics.   ABSTRAKPenelitian ini bertujuan menyelidiki dinamika stabilitas statis (N2), energi potensial gelombang gravitas (Ep), dan pusaran angin di lapisan stratosfer Belahan Bumi Utara (BBU) selama musim dingin 2012-2013 menggunakan data temperatur (T) dan komponen angin zonal (u) dari NCEP-DOE Reanalysis II. Hasil riset menunjukkan bahwa dua kejadian penurunan N2 pada pekan awal dan ketiga bulan Desember 2012 diyakini sebagai pemicu kejadian Sudden Stratosphere Warmings (SSW) tanggal 7 Januari 2013. Pada saat terjadi SSW terdapat aliran dari kutub menuju tropis. Aliran ini mengakibatkan terjadinya pelipatan lapisan tropopause di wilayah sub-tropis yang terlihat pada distribusi Ep tanggal 24 Januari 2013. Pelipatan lapisan tropopause ini kemudian memicu aktivitas konvektif di atas wilayah Indonesia yang ditandai oleh anomali OLR negatif antara tanggal 22-26 Januari 2013. Dampak kejadian SSW di BBU terhadap aktivitas konvektif di atas wilayah kepulauan Indonesia sebesar 20%. Hasil ini membuktikan interaksi antara lapisan stratosfer dan troposfer serta telekoneksi wilayah kutub dan tropis.
ANALISIS GERAK BINTIK MATAHARI BIPOLAR SEBELUM TERJADI FLARE PADA NOAA 0484 TANGGAL 21 DAN 22 OKTOBER 2003 Rasdewita Kesumaningrum; Clara Y. Yatini; Santi Sulistiana
Jurnal Sains Dirgantara Vol 4, No 2 (2007)
Publisher : Lembaga Penerbangan dan Antariksa Nasional

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Abstract

In this reserach we analyzed the proper motion of individual sunspots whithin sunspots group NOAA 0484 in association with M2,4 and M1,7 flires occured on 21 October 2003 and 22 october 2003, respectively, using TRACE data (http://vestige.Imsal.com/TRACE). We measured the the movements of pairs of sunspots associated with flares relative to a reference spot in the active region whithin the period of 2 hours before the flare occurred and we calculated the mean velocities. We also measured the movements of other spots those were not associated with flares for comparisons. From these measurements and calculations, we found that (1) the distance between spots associated with flares are getting bigger especially in solar longitudinal direction and (2) they have bigger velocity that the other spots those were not associated to flares.
PROYEKSI AWAL MUSIM DI JAWA BERBASIS HASIL DOWNSCALING CONFORMAL CUBIC ATMOSPHERIC MODEL (CCAM) (SEASON ONSET PROJECTION IN JAVA BASED ON CCAM DOWNSCALING OUTPUT) Haries Satyawardhana; Armi Susandi
Jurnal Sains Dirgantara Vol 13, No 1 (2015)
Publisher : Lembaga Penerbangan dan Antariksa Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (849.296 KB) | DOI: 10.30536/j.jsd.2015.v13.a2311

Abstract

Penelitian mengenai awal musim dengan kriteria Badan Meteorologi, Klimatologi dan Geofisika (BMKG) yang menggunakan curah hujan dasarian di Indonesia telah banyak dilakukan, namun data yang digunakan masih memiliki keterbatasan dalam periode analisis, resolusi spasial yang masih rendah dan masih belum dapat menghasilkan proyeksi ke depan. Penggunaan model iklim adalah jawaban untuk mengatasi semua keterbatasan tersebut. Penelitian ini menggunakan Conformal Cubic Atmospheric Model (CCAM) untuk downscaling dari data model iklim global dan reanalisis National Center for Environmental Prediction/National Center for Atmospheric Research (NCEP/NCAR). Periode waktu yang digunakan adalah periode 1991 2010 (20 tahun) sebagai periode baseline (kondisi saat ini) dan periode 2011 2030 sebagai periode proyeksi ke depan. Penentuan awal musim pada penelitian ini menggunakan kriteria curah hujan dasarian dari Badan Meteorologi, Klimatologi dan Geofisika (BMKG). Hasil dari penelitian ini menunjukkan bahwa proyeksi dengan menggunakan skenario A2 IPCC menyimpulkan bahwa Awal Musim Kemarau (AMK) di sebagian besar daerah Pulau Jawa datang lebih cepat, sedangkan Awal Musim Hujan (AMH) cenderung mundur atau datang lebih lambat dari baseline. Dengan kata lain, Pulau Jawa diproyeksikan mengalami musim kemarau yang lebih panjang dan musim hujan yang lebih pendek dibandingkan kondisi saat ini.Kata kunci: CCAM, Downscaling, AMK, AMH
IDENTIFIKASI MODEL FLUKTUASI INDEKS K HARIAN MENGGUNAKAN MODEL ARIMA (2.0.1) - Habirun
Jurnal Sains Dirgantara Vol 2, No.2 Juni (2005)
Publisher : Lembaga Penerbangan dan Antariksa Nasional

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Abstract

The geomagnetic level called geomagnetic index. Based on the latitude, geomagnetic index for high to intermediate latitude is Kp index and for equator area is Dst index. For a certain location it is called local geomagnetic index, K index. Flunctuation of geomagnetic index is one of information that describes condition of space weather. Based on the above condition, this paper discusses identification of daily K index flunctuation model using Auto Regression Integrated Moving Average-ARIMA (2.0.1), 2, 0, and 1 order. Using observation data 1 order. Using observation data and reconstruction of four days data, it is found ARIMA (2.0.1) model 2, 0, and 1 order. Both model are validated, calculating errors and pattern correlation. Model validation result using observational data, showed the error of 2.18 and the pattern correlation of 0,99940. Model validation using reconstruction data, showed the error of 0.3582 and the pattern corelation of 0.9988.
DAMPAK HUJAN METEOR PADA KEMUNCULAN LAPISAN E-SPORADIS DI ATAS SUMEDANG (THE IMPACT OF METEOR SHOWERS ON THE OCCURRENCE OF E-SPORADIC LAYER OVER SUMEDANG) Rhorom Priyatikanto; Farahhati Mumtahana; Mumen Tarigan
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 (894.89 KB) | DOI: 10.30536/j.jsd.2017.v14.a2533

Abstract

Meteor showers have been believed as one important source of metalic ion which is accumulated at ~100 km altitude and triggering the emergence of E-Sporadic layer. In this study, meteor showers catalogue derived from the observations in visual and radio windows were used to establish a model and temporal map of annual meteor showers expected to be observed in Sumedang, West Java. The map was compared to ionospheric observation data acquired in Sumedang throughout 2014-2015 in order to understand the relation between the showers of various fluxes to the occurrence of E-Sporadic layer. The analysis revealed that several meteor showers with geocentric speed of vG < 50 km/s possibly influence the occurrence of E-Sporadic layer, while the showers with vG > 50 km/s impact insignificantly. However, the seasonal variation of the percentage of E-Sporadic occurrence is far more dominant compared to its fluctuation during meteor showers.Abstrak Hujan meteor dengan fluks tinggi telah dipercaya sebagai salah satu sumber penting ion logam yang terkumpul pada ketinggian ~100 km dan memicu kemunculan lapisan E-Sporadis. Pada studi ini, katalog hujan meteor hasil pengamatan pada jendela visual dan radio digunakan untuk membangun model dan peta temporal hujan meteor tahunan yang diharapkan teramati di Sumedang, Jawa Barat. Peta tersebut dibandingkan dengan data pengamatan ionosfer di Sumedang sepanjang 2014-2015 untuk mengetahui keterkaitan antara hujan meteor dengan beragam fluks serta kemunculan lapisan E-Sporadis. Hasil analisis menunjukkan bahwa beberapa hujan meteor dengan kelajuan geosentris vG < 50 km/s memiliki indikasi berpengaruh pada kemunculan E-Sporadis, sementara hujan meteor dengan vG > 50 km/s tidak berdampak signifikan. Namun, variasi musiman dari persentasi kemunculan E-Sporadis jauh lebih dominan dibandingkan fluktuasinya saat hujan meteor.
POTENSI KEJADIAN BADAI GUNTUR BERDASARKAN PARAMETER KELEMBAPAN, LABILITAS UDARA, DAN MEKANISME PENGANGKATAN (STUDI KASUS: DI BANDAR UDARA FRANS KAISIEPO BIAK) Dian Mayangwulan; Joko Wiratmo; Plato Martuani Siregar
Jurnal Sains Dirgantara Vol 8, No 2 (2011)
Publisher : Lembaga Penerbangan dan Antariksa Nasional

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Abstract

 Thunderstorms is a weather condition that is harmful to the flight activities. The potential thunderstorms (especially thermal thunderstorms) assesment for Indonesia in particular Biak area needs to be done to reduce the risk of bad thunderstorms to flight activity at airports Frans Kaisiepo Biak. The thunderstorms is affected by the existence of water vapor in the atmosphere. The content of water vapor in the atmosphere can be estimated from the value of precipitable water, while atmospheric instability conditions can be identified from the Convective Available Potential Energy (CAPE), assuming an air parcel at the surface is heated until it reaches the temperature of the convective (TC) so that air parcels can be lifted up to convective condensation level (CCL) and it condensate. Logistic regression is one of mathematical models approach that can be used to describe the relationship between the independent variables with response variables that are bound dikotomik (event and non-event). By using observation data of surface and upper air in 2006-2009 analysis of air instability and its relation to the probability of thunderstorm occurrence is carried out. Results show that precipitable water between surface and 300 hPa height has correlation and directly proportional to the probability of thunderstorm occurrence, and convective temperature (TC) has correlation and inversely proportional to the probability of thunderstorm occurrence. While CAPE at CCL to 300 hPa height has not correlation to the probability occurrence of thunderstorms. Thunderstorm probability model has 58.8% of accuracy. Keywords:Thunderstorms, Precipitable water, Convective temperature, CAPE, Logistic regression
MODEL KOEFISIEN BALISTIK SATELIT LEO SEBAGAI FUNGSI CUACA ANTARIKSA S.L. Manurung; Heri Sutastio
Jurnal Sains Dirgantara Vol 4, No.1 Desember (2006)
Publisher : Lembaga Penerbangan dan Antariksa Nasional

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Abstract

The long term 1996-2003, of star or modified ballistic coefficients, B*, of five Low Earth Orbiting satellite, solar flux, F10.7 and geomagnetic planetary index Ap were analyzed to find out the effect of space weather on the ballastic coefficient of space craft. The daily variation and 81 days per moving average of ballistic coefficient and F10.7 were in phase, while both variation and Ap index were often out phase. Eventhough the mechanism of balliastic coefficient generated by space weather is still not known clearly, there is a statistically closed relation between ballistic coefficient and solar flux. The relationship, called model, is a second order polinomial function with different constants. Using before and after 2003 data of both parameter the models were verified. The range errors are less then the ralative error of pradicted ballistic coefficient of Bepposax satellite obtained by NASA/JFC a month before the satellite reentry.
ANALISIS INDEKS KUALITAS SINYAL PADA MANAJEMEN FREKUENSI BERBASIS DATA AUTOMATIC LINK ESTABLISHMENT (ALE) [ANALYSIS OF SIGNAL QUALITY INDEX IN MANAGEMENT FREQUENCY BASED ON AUTOMATIC LINK ESTABLISHMENT (ALE) DATA] Varuliantor Dear; Gatot Wikantho
Jurnal Sains Dirgantara Vol 11, No 2 (2014)
Publisher : Lembaga Penerbangan dan Antariksa Nasional

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Abstract

Manajemen frekuensi komunikasi radio HF (3-30MHz) berbasis data jaringan sistem Automatic Link Establishment (ALE) telah dilakukan berdasarkan analisis indeks kualitas sinyal yang diperoleh. Hasil penerapan menunjukkan bahwa manajemen frekuensi berbasis data ALE dapat memberikan informasi tambahan berupa jaminan kualitas kanal yang lebih optimal. Kanal yang optimal diperoleh berdasarkan analisis nilai indeks penerimaan sinyal untuk tiap frekuensi yang diamati pada sistem ALE. Dalam proses yang dilakukan, penentuan frekuensi kerja dibatasi oleh nilai selisih peluang minimum (ΔP{F}min) yang merujuk pada acuan dari performa minimum perancangan link availability komunikasi radio HF, yakni nilai Lower Decile. Pembatasan nilai selisih peluang minimum dilakukan sebelum proses analisis indeks kualitas sinyal. Dalam makalah ini, data yang digunakan adalah data jaringan ALE untuk sirkuit Bandung-Wakosek pada tahun 2012. Proses penerapan yang dilakukan dengan batasan nilai selisih peluang (ΔP{F}min) yang mencapai 0,033 atau 3,3%, menghasilkan suatu nilai frekuensi kerja yang memiliki perbedaan dengan hasil dari proses penerapan tanpa mempertimbangkan kualitas sinyal penerimaan. Perbedaan diperoleh pada bulan Maret dan April dengan selisih indeks kualitas sinyal berada pada rentang 0,42 dan 0,55 Berdasarkan hasil yang diperoleh, frekuensi kerja yang direkomendasikan, dapat memberikan informasi kualitas kanal yang optimal dalam perencanaan komunikasi radio HF.Kata kunci: Indeks kualitas sinyal, ALE, Manajemen frekuensi, Komunikasi radio HF
EVALUASI PEMETAAN POTENSI ENERGI SURYA BERBASIS MODEL WRF DI DESA PALIHAN DAN DESA AIKANGKUNG Bono Pranoto; Dian Galuh Cendrawati; Nurry Widya Hesty; Errie Kusriadie
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 (1167.654 KB) | DOI: 10.30536/j.jsd.2018.v15.a2521

Abstract

Penggunaan model numerik Weather Research and Forecasting (WRF) untuk memprediksi potensi energi surya dapat digunakan sebagai langkah awal pemetaan. Peta hasil prediksi WRF perlu diverifikasi guna meningkatkan kualitas data. Dalam penelitian ini, digunakan data WRF dengan rentang tahun 2001 hingga 2010. Untuk verifikasi digunakan data observasi radiasi matahari selama 12 bulan pada 2 lokasi yaitu desa Palihan (Provinsi Yogjakarta) dan desa Aikangkung (Provinsi Nusa Tenggara Barat). Metoda yang digunakan adalah penurunan skala (downscaling), prediksi, verifikasi dan koreksi. Hasil verifikasi memperlihatkan lokasi 1 (desa Palihan) memiliki deviasi yang lebih besar (Mape=22.59%) dibanding pada lokasi 2 (desa Aikangkung) dengan nilai Mape=12.95%. Perbedaan nilai antara model WRF dan data observasi dimanfaatkan untuk mengkoreksi peta potensi energi surya. Hasil peta yang telah terkoreksi, memiliki nilai Mape = 0.0007% untuk desa Palihan dan 7% untuk desa Aikangkung.  

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