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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 5 Documents
 1 
Search results for , issue "Vol 2, No.1 Desember (2004)" : 5 Documents clear
PENETUAN RADIUS BULIR DARI FOTOMETRI ASTRONOMI: PERBANDINGAN TIGA METODE BERBASIS MODEL MIE Nuning Nuraini; Hakim L. Malasan; Tri W. Hadi
Jurnal Sains Dirgantara Vol 2, No.1 Desember (2004)
Publisher : Lembaga Penerbangan dan Antariksa Nasional

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Abstract

This paper discusses modeling steps of the total extinction coefficients,deduced from the astronomical photometric observations, to estimate aerosol perticulate size in the atmospheric layer. One important step in modeling is the application of Mie theory through Wempe's extinction law for aerosol and introduced by Angstrom (1929), i.e. The factor Qext is derived by elaborating Mie theory, through extinction efficiency factor which has been normalized, and an assumption that particle size is represented by a log-normal distribution. Final result of aerosol radius is deduced by fitting a decomposed observed extinction coefficient with that computed using the three Mie theory developed to estimate the best aerosol particulate's size.
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.
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.
EVIDENCE OF ADDITIONAL LAYER FORMATION IN THE LOW LATITUDE IONOSPHERE Sarmoko Saroso
Jurnal Sains Dirgantara Vol 2, No.1 Desember (2004)
Publisher : Lembaga Penerbangan dan Antariksa Nasional

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Abstract

Ionogram recorded from four ionosonde stations are employed to study the accurrence of an additional layer at F-region altitudes during 1-15 March 1998. It was found that the appearance of the additional layer at the local noontime hours is a typical phenomenon at Parepare (4˚S geographic, 14.8˚S geomagnetic) and Manila (3.7˚N geomagnetic), and was not observed at Chung-Li (14.2˚N geomagnetic). Furthermore, the additional layer was nor seen from any indicate that the fountain effect plays an important role in the formation of the additional layer. However, they also suggest the dynamics of the layer formation are in some way influenced by the location of the station relative to the geographic aquator.
PENGAMATAN AWAN CIRRUS SUBVISIBLE DI ATAS BANDUNG MENGGUNAKAN RAMAN LIDAR (STUDI KASUS: BULAN SEPTEMBER 2000) Saipul Hamdi; Sri Kaloka
Jurnal Sains Dirgantara Vol 2, No.1 Desember (2004)
Publisher : Lembaga Penerbangan dan Antariksa Nasional

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Abstract

Lidar Equipment has been developed by some lidar groups, and shows good performance for monitoring vertical profile of water vapour, temperature, and aerosol. In 1996, lidar equipment has been installed in LAPAN Bandung under joint research between Indonesia and Japan, and start for intensively observation since the beginning of 1997. There are several parameters can be taken by Lidar i Bandung, i.e. vertical distribution of backscattering ratio, depolarization ratio, and temperature. Observation taken in September 17th, 2000 is simultaneously to radiosonde observation. At this time we detect the existence of optically this layerjust below tropopause. We suggest this layer as subvisible cirrus cloud. This layer is 2 km thick and temperature is in range -70℃ to -80℃. Depolarization ratio of this layer is 10% or more, and backscattering ratio is less than 3.

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