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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 8 Documents
 1 
Search results for , issue "Vol 14, No 2 (2016)" : 8 Documents clear
PENGARUH AEROSOL TERHADAP FLUKS RADIASI NETO DI LAPISAN ATAS ATMOSFER DAN DI PERMUKAAN BERDASAR DATA SATELIT [INFLUENCE OF AEROSOL ON NET RADIATION FLUX AT THE TOP OF ATMOSPHERE AND SURFACE BASED ON SATELLITE] nFN Rosida; Indah Susanti
Jurnal Sains Dirgantara Vol 14, No 2 (2016)
Publisher : Lembaga Penerbangan dan Antariksa Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1235.762 KB) | DOI: 10.30536/j.jsd.2016.v14.a2444

Abstract

The direct effects of aerosols on radiation budget in Indonesia have been analyzed based on radiation flux net data from the Clouds and the Earth's Radiant Energy System (CERES) instrument and aerosol optical depth (AOD) from the Moderate Resolution Imaging Spectroradiometer (MODIS) Terra. Radiation budget calculated including short wave and long-wave radiation. Data from March 2000 until February 2010, processed using Grads version 2 to obtain aerosol radiative forcing value. Net radiation in clean sky, estimated using slope method. The analysis showed high temporal variation of aerosols density in the atmosphere with a value AODmax> 2, which generally causes decreases net radiation flux, so providing a cooling effect. The influence of aerosols on the net radiation flux can be very clearly seen in the case of forest fires. AOD in 2006 increased and caused radiation flux anomalies ranging from -9 watt/m-2 to -14 watts/m-2, with the largest decline occurred in the surface. From all the data period, aerosol radiative forcing at TOA level (ARFTOA) on Indonesia was -0.49 watt/m-2 and aerosol radiative forcing at the surface level (ARFSurf) on Indonesia was -17.72 watt/m-2, that influence to the Indonesian climate condition.
ANALISIS PROPAGASI GELOMBANG RADIO MODE ANGKASA SAAT PERISTIWA GERHANA MATAHARI 9 MARET 2016 [SKYWAVE PROPAGATION ANALYSIS DURING SOLAR ECLIPSE ON 9 MARCH 2016] varuliantor dear; Rohmat Yulianto
Jurnal Sains Dirgantara Vol 14, No 2 (2016)
Publisher : Lembaga Penerbangan dan Antariksa Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1521.048 KB) | DOI: 10.30536/j.jsd.2016.v14.a2490

Abstract

In this paper we discuss about the skywave radiowave propagation analysis during the solar eclipse in 9th March 2016. The analysis were using the observation results that use the Automatic Link Establishment (ALE) waveform with 10.1455 MHz as a carrier frequency in Biak (01.16 N; 136.047 E)-Manado(1.52 N; 124.856 E) circuit communication. The working frequency value was based on the result of ionospheric model for Biak-Manado circuits during the solar eclipse. The observation results show a difference in the SN index values of the Link Quality Analysis (LQA) ALE data between the time when the solar eclipse occured with the day before and after. The difference variation of SN index values could be explained by the occurences of the different variation in the D layer absorption levels. The difference of an absorption are affecting the magnitude of the received signal values. The variation of absorption levels during the solar eclipse cause the SN index values have a postive linear tren with gradien value reach 1.3. This value was different compares to the day before and after which have a negative linear trend with gradien up to -13 and -9,6. The difference also shown in the distribution parameters of SN index values. During solar eclipse the mean (?) value was 5.2384 with standard deviation (?) was 0.74894. But for the day before and after, the ? values were 4.8316 and 4.6164 with ? were 0.92123 and 0.9096.ABSTRAKMakalah ini membahas tentang analisis propagasi gelombang radio mode angkasa saat terjadi peristiwa gerhana matahari pada tanggal 9 maret 2016. Analisis dilakukan berdasarkan hasil pengamatan menggunakan waveform sistem Automatic Link Establishment (ALE) pada frekuensi 10,145 MHz untuk sirkuit komunikasi Biak-Manado. Nilai frekuensi kerja yang digunakan merujuk pada hasil perhitungan model kondisi ionosfer diwilayah sirkuit Biak (01,16 LU; 136,047 BT)-Manado(1,52 LU; 124,856 BT) pada saat gerhana matahari berlangsung. Hasil pengamatan yang diperoleh menunjukan terjadinya perbedaan variasi nilai indeks SN pada data Link Quality Analysis (LQA) sistem ALE antara saat kejadian gerhana matahari dengan hari sebelum dan sesudahnya diwaktu yang sama. Perbedaan variasi besaran nilai indeks SN tersebut dapat dijelaskan sebagai akibat adanya perbedaan perubahan tingkat absorpsi pada lapisan D ionosfer yang menyebabkan besaran sinyal yang diterima pada perangkat penerima mengalami perubahan. Perubahan tingkat absorpsi pada lapisan D saat peristiwa gerhana matahari menyebabkan nilai indeks SN memiliki tren meningkat dengan nilai gradien persamaan linear mencapai 1.3. Tren dan nilai indeks SN tersebut berbeda dengan hasil pada hari sebelum dan sesudahnya yang mencapai -13 dan -9,6. Perbedaan tersebut juga terlihat jelas dari parameter distribusi nilai indeks SN yang diperoleh. Pada saat gerhana matahari parameter nilai mean (?) sebesar 5,2384 dengan standar deviasi (?) 0,74894. Sedangkan pada hari sebelum dan sesudahnya nilai ? distribusi indeks SN mencapai 4,8316 dan 4,6164 dengan ? sebesar 0,92123 dan 0,9096.
Front Pages JSD Vol 14 No 1 Desember 2016 Redaksi Jurnal
Jurnal Sains Dirgantara Vol 14, No 2 (2016)
Publisher : Lembaga Penerbangan dan Antariksa Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (622.574 KB)

Abstract

Front Pages JSD Vol 14 No 1 Desember 2016
ESTIMASI BADAI GEOMAGNET BERDASARKAN PERILAKU PARAMETER ANGIN SURYA DAN MEDAN MAGNET ANTARPLANET SEBELUM BADAI GEOMAGNET (THE ESTIMATION OF GEOMAGNETIC STORM BASED ON SOLAR WIND PARAMETERS AND INTERPLANETARY MAGNETIC FIELD BEHAVIOR BEFORE GEOMAGNETIC STOR Anwar Santoso; Mamat Rahimat; Rasdewita Kesumaningrum; Siska Filawati
Jurnal Sains Dirgantara Vol 14, No 2 (2016)
Publisher : Lembaga Penerbangan dan Antariksa Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (891.58 KB) | DOI: 10.30536/j.jsd.2016.v14.a2327

Abstract

Space weather research is the principal activity at the Space Science Center, Lapan to learn characteristics and generator source of the space weather so that can mitigate its the impact on the Earth's environment as mandated in Law No. 21 Year 2013. One of them is the phenomenon of geomagnetic storms. Geomagnetic storms caused by the entry of solar wind together with the IMF Bz that leads to the south. The behavior of the solar wind parameters together with the IMF Bz before geomagnetic storms can determine the formation of geomagnetic storms that caused it. In spite that, by the solar wind parameters and IMF Bz behavior before geomagnetic storm can be estimated its intensity through the equation Dst * = 1.599 * Ptotal - 34.48. The result of this equation is obtained that the Dst minimum deviation between the raw data and the output of this equation to the geomagnetic storm events on March 17, 2013 is about of -2.51 nT or 1.9% and on the geomagnetic storm events on February 19, 2014 is about of 2.77 nT or 2, 5%. Thus, the equation Dst * = 1.599 * Ptotal - 34.48 is very good for the estimation of geomagnetic storms.
Back Pages JSD Vol 14 No 1 Desember 2016 Redaksi Jurnal
Jurnal Sains Dirgantara Vol 14, No 2 (2016)
Publisher : Lembaga Penerbangan dan Antariksa Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (268.003 KB)

Abstract

Back Pages JSD Vol 14 No 1 Desember 2016
PERBANDINGAN KARAKTERISTIK AKTIVITAS SINTILASI IONOSFER DI ATAS MANADO, PONTIANAK DAN BANDUNG DARI DATA PENERIMA GPS (CHARACTERISTICS COMPARISON OF IONOSPHERIC SCINTILLATION ACTIVITIES OVER MANADO, PONTIANAK AND BANDUNG BASED ON GPS RECEIVER DATA) Sri Ekawati; Sefria Anggarani; Dessi Marlia
Jurnal Sains Dirgantara Vol 14, No 2 (2016)
Publisher : Lembaga Penerbangan dan Antariksa Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (896.52 KB) | DOI: 10.30536/j.jsd.2016.v14.a2330

Abstract

Ionospheric scintillation activity on certain region need to be known its characteristics since its occurrence can degrade satellite signal quality of global satellite navigation system (GNSS) and also satellite communication that works at L-band frequency. The occurrence of ionospheric scintillation varies with location. Therefore, this paper aimed to determine comparative charasteristics of ionospheric scintillation activity over Manado, Pontianak and Bandung from amplitude scintillation index S4 data derived from GPS receiver. The data obtained from the GPS Ionospheric Scintillation and TEC Monitor (GISTM) at Manado station (1.48o N; 124.85oE geomagnetic latitude 7.7oS), at Pontianak station (0.03o S;109.33oE geomagnetic latitude 9.7oS) and at Bandung (-6.90oS;107.6oE geomagnetic latitude 16.54oS) on July 2014 to June 2015. The data were classified into three categores : quiet, moderate and strong based on s4 index. Then we calculated percentage occurrence of scintillation monthly from each observation stastions and mapping of S4 index over Manado, Pontianak and Bandung. The results show that the presentage of strong scintillation (S4>0.5) above Manado is always lower than the other stastions. Strong scintillation was detected at one stations may not also detected at other stations. For very strong scintillastion event, the occurrence of strong scintillation could be detected by all observation stastions but vary in duration. Duration of strong scintillation over Bandung was the longest (up to 4 hours) compared to Pontianak (less than 2 hours) and Manado (less than 1 hour). Based on map of distribution scintillastion occurrence, strong scintillation occurs more intensively over Bandung than over Pontianak and Manado.
Full paper JSD Vol. 14 No. 1 Desember 2016 Redaksi Jurnal
Jurnal Sains Dirgantara Vol 14, No 2 (2016)
Publisher : Lembaga Penerbangan dan Antariksa Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (7166.342 KB) | DOI: 10.30536/j.jsd.2016.v14.a2922

Abstract

PREDIKTIBILITAS CURAH HUJAN DIURNAL DI PULAU JAWA MENGGUNAKAN MODEL WRF [PREDICTIBILITY OF DIURNAL RAINFALL OVER JAVA ISLAND USING WRF] nFN Suaydhi
Jurnal Sains Dirgantara Vol 14, No 2 (2016)
Publisher : Lembaga Penerbangan dan Antariksa Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1812.42 KB) | DOI: 10.30536/j.jsd.2016.v14.a2375

Abstract

Indonesian region often experiences hydrometeorological disasters such as floods and landslides. To mitigate the losses from such disasters, an early warning system is needed. PSTA LAPAN has developed an early warning system called SADEWA (Satellite Disaster Early Warning System). The performance of this early warning system needs to be evaluated in order to increase the confidence level. The evaluation of the WRF performance in producing the prediction was carried out by analyzing the diurnal cycles of rainfall over Java and its surroundings using the results of WRF predictions implemented in SADEWA and GSMaP data for one year period (Maret 2014 Februari 2015). The contrasting diurnal cycles between Java island and its surrounding seas could be well simulated by the WRF model, both the amount and the frequency of the rainfall. However, the phase of diurnal cycle from the WRF prediction leads that of the observation by two hours and the amplitude of the simulated diurnal cycle is higher than the observed. The results also show that the WRF predictions could not simulate the effects of MJO (Madden-Julian Oscillation) on the diurnal cycles of rainfall over Java.ABSTRAKWilayah Indonesia sering mengalami bencana hidrometeorologi seperti banjir dan tanah longsor. Untuk mengurangi kerugian yang diakibatkan oleh kejadian bencana meteorologi diperlukan suatu sistem peringatan dini. PSTA LAPAN telah mengembangkan sebuah sistem peringatan dini yang diberi nama SADEWA (Satellite Disaster Early Warning System). Kinerja sistem peringatan dini seperti ini perlu dievaluasi agar tingkat kepercayaannya meningkat. Evaluasi kinerja hasil prediksi ini dilakukan dengan menganalisis siklus diurnal curah hujan di pulau Jawa dan sekitarnya pada data hasil prediksi WRF yang digunakan dalam SADEWA dan data GSMaP selama satu tahun (Maret 2014 Februari 2015). Siklus diurnal curah hujan yang kontras antara pulau Jawa dengan lautan sekitarnya mampu disimulasikan dengan baik oleh model WRF, baik dari jumlah maupun frekuensi curah hujannya. Namun fasa diurnal dari hasil prediksi WRF mendahului fasa data pengamatan sekitar dua jam dan mempunyai amplitudo lebih besar. Hasil analisis juga menunjukkan hasil prediksi WRF belum mampu mensimulasikan pengaruh MJO (Madden-Julian Oscillation) pada siklus diurnal curah hujan di Jawa.

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