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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 6 Documents
 1 
Search results for , issue "Vol 8, No 2 (2011)" : 6 Documents clear
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
AWAN MAGNET PADA FASE MINIMUM AKTIVITAS MATAHARI DAN KAITANNYA DENGAN GANGGUAN GEOMAGNET Clara Y. Yatini; Mamat Ruhimat
Jurnal Sains Dirgantara Vol 8, No 2 (2011)
Publisher : Lembaga Penerbangan dan Antariksa Nasional

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Abstract

 Interplanetary structures are important for the development of geomagnetic disturbance. The structures include intense north-southward Interplanetary Magnetic Field, the shock, solar wind density and velocity, and probably the magnetic cloud. We studied five events of magnetic clouds which occurred in the minimum phase of solar activity in order to understand solar wind-magnetosphere coupling. The correlations between storm intensity and the different solar wind parameters will also be presented as well. By analyzing five magnetic clouds occurred in 2006 and the associated geomagnetic enhancement, we found that not all magnetic clouds lead to geomagnetic disturbances. Keywords:Magnetic cloud, Interplanetary magnetic field, Geomagnetic disturbance
ANALISIS ASOSIASI SEMBURAN RADIO MATAHARI TIPE III DENGAN FLARE SINAR-X DAN FREKUENSI MINIMUM IONOSFER - Suratno; Sri Suhartini
Jurnal Sains Dirgantara Vol 8, No 2 (2011)
Publisher : Lembaga Penerbangan dan Antariksa Nasional

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Abstract

 The type III solar radio bursts is an indicator of solar X-ray flare phenomena. The effect of solar X-ray flares to the ionospheric layer is the increasing of minimum frequency (fmin) which indicates the absorption of incoming high frequency (HF) radio wave. Further impact is a disturbance of high frequency radio communications. The number and flux density of type III bursts and X-ray flare can used as an information of ionospheric disturbance possibility. The correlation analysis shows that the number of X-ray flare is related to the number of ionospheric absorption and the time duration of these absorption. The serial event of type III bursts and solar X-ray flare occures during February 6th to 12th, 2010 are an example cases of the early warning of possibility of radio communications disturbances. Key Words:Solar radio bursts, X-ray flare, Radio communication disturbance
PROYEKSI DEBIT ALIRAN PERMUKAAN DAS CITARUM BERBASIS LUARAN MODEL ATMOSFER Sinta Berliana Sipayung; Nani Cholianawati
Jurnal Sains Dirgantara Vol 8, No 2 (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
ANALISIS KONDISI ANTARIKSA DI ORBIT LAPAN A2 MENJELANG PUNCAK AKTIVITAS MATAHARI SIKLUS 24 Nizam Ahmad; - Neflia
Jurnal Sains Dirgantara Vol 8, No 2 (2011)
Publisher : Lembaga Penerbangan dan Antariksa Nasional

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Abstract

 LAPAN A2 satellite will be placed at 650 km altitude and inclination of 8 at the beginning of year 2012 based on the initial scenario. This satellite has structure with the size and weight are 60 cm x 60 cm x 80 cm and 65 kg consecutively. Space environment analysis on this satellite using space weather pattern method showed that geomagnetic activity levels, represented by Kp and Dst indices, had range of 2 to 4 and -40 to -9 nT consecutively. It means that the effect of geomagnetic activity will not significantly impact the satellite system. Simulation using SPENVIS also showed small impact of proton and electron on satellite structure. Analyzing on atmospheric drag showed that this satellite has stable orbit. The only possibility of LAPAN A2 satellite experiences charging come from charged particles trapped in South Atlantic Anomaly (SAA) that contain high flux of particles. Keywords:LAPAN A2 Satellite, Geomagnetic, Particle
KARAKTERISTIK PETIR DARI AWAN KE BUMI DAN HUBUNGANNYA DENGAN CURAH HUJAN Deni Septiadi; Safwan Hadi; Bayong Tjasyono
Jurnal Sains Dirgantara Vol 8, No 2 (2011)
Publisher : Lembaga Penerbangan dan Antariksa Nasional

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Abstract

 This paper describes the relationship between CG (Cloud to Ground) lightning and the rainfall of Bandung and surrounding area. CG lightning data obtained by Lightning Detector that is able to track low frequency of radio signals from electrical processes lightning discharge which installed in Bandung Geophysics Station. For better resolution, data is limited within a radius of 10 km square of study area. Daily analysis during the year 2009 showed a strong relationships between CG and rainfall (r = 0,62 for CG+; r = 0,51 for CG- and r = 0,59 for total of CG). The electrification process dominated by CG- and the peak of CG occurs at MAM with the 43,6% total of CG and occurs at 15.00-17.00 LT. The mature stage occured after 13.00 LT. Keywords:Lightning, CG, Rainfall, Relationship

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