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Your search keyword '"Admiranto, A. Gunawan"' showing total 6 results
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6 results on '"Admiranto, A. Gunawan"'

1. Cosmic radiation observations in civil aircraft flights.

Author

Admiranto, A. Gunawan, Yatini, Clara Y., Muhamad, Johan, Maryam, Siti, Elyyani, Sofyan, Hasnel, Prasetyo, Heru, Kusdiana, and Noor, Ferdiansyah

Subjects
*COSMIC rays, *SEA level, *NEUTRONS, *RADIATION doses, *DOSIMETERS
Abstract

We analyzed dose rate data of space neutron and gamma radiation during several flight with various destinations, i.e. Jakarta – Kupang, Kupang – Jakarta, Jakarta – Pontianak, and Pontianak – Jakarta. Data were collected using personal radiation dosimeter (RadEye for neutron and Dosicard for gamma radiation) during flights from take off until landing at the destination airports. As expected, the higher the aircraft from sea level, the radiation received are higher also, but the behaviour of the neutron and gamma radiation are different. The neutron radiation received are more erratic compared with that of the gamma radiation. We found the correlation between the height of the aircraft and neutron and gamma radiation dose rates with correlation coeficient values of 0.89, 0.86, 0.90, 0.87 respectively for neutron radiation and 0.91, 0.95, 0.84, 0.88 respectively for gamma radiation. We found the empirical relations between latitude and dose rates of neutron and gamma radiation in the height of 35.000 feet from the sea level as Dn = −0.034 Lat + 1.036 for neutron dose rates and Dg = −0.027 Lat + 0.636 for gamma radiation dose rates. [ABSTRACT FROM AUTHOR]

Published
2023
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2. Light Pollution Observations in Indonesia

Author

Admiranto, Agustinus Gunawan, Priyatikanto, Rhorom, Maryam, Siti, Elyyani, Elyyani, Kurniawati, Siti, and Saputro, Muhammad Faizal Eko

Subjects
Technology & Engineering
Abstract

Light pollution is a growing concern in the world. It affects many walk of lives, including human health, the degradation of nocturnal animal habitat, and the inability of the astronomers to observe dimmer objects. We in Space Science Center of LAPAN (Indonesian National Institute of Aeronautics and Space) try to mitigate this through a coordinated observation of light pollution using Sky Quality Meter equipments which are located in several LAPAN’s stations [Agam (West Sumatra), Pontianak (West Kalimantan), Sumedang (West Java), Garut (West Java), Pasuruan (East Java), Kupang (East Nusa Tenggara), and Biak (Papua)]. The observations has been conducted since 2018 in stationary and moving modes, and the results are then sent to a central database which is located in Space Science Center in Bandung (West Java). The results showed that there are some variations of light pollution across Indonesia. In this respect most of the stations have moderate pollution as can be seen from the values of Biak, Agam, Sumedang, and Pontianak (20.0, 19.5, 19.6, and 17.7 mpsas respectively). On the other hand, the stations which are located near or in cities have high light pollution (Bandung and Pasuruan with 17.1 and 18.0 mpsas, respectively). A particular station (Garut) has low light pollution (20.6 mpsas). The data of these observations are presented in a website to be accessed by interested parties.

Published
2019

3. Map of Sky Brightness over Greater Bandung and the Prospect of Astro-Tourism.

Author

Priyatikanto, Rhorom, Admiranto, Agustinus Gunawan, Putri, Gerhana Puannandra, Elyyani, Maryam, Siti, and Suryana, Nana

Subjects
*SKY brightness, *LIGHT pollution, *INFRARED imaging, *CLOUDINESS, *TOURIST attractions
Abstract

In this paper, results of moving campaigns of night sky brightness measurement over Greater Bandung area are reported as a part of the first step to mitigate the level of light pollution in the area and its multidimensional impact. Though the campaigns were not commenced in ideal condition in terms of cloud cover and moon light contamination, some statistical treatment and moonlight correction were performed to improve the quality of the data. The obtained value of sky brightness range from ~17 mpsas at downtown region to ~20 mpsas at Haurgombong, Sumedang which is more than 30 km away from the city center. It is in agreement with monthslength stationary measurements of sky brightness over Bandung, Lembang, and Sumedang. R-square (R^2) between this in-situ measurement and the average nighttime radiance map from Visible Infrared Imaging Radiometer Suite Day/Night Band (VIIRS-DNB) was found such that empirical relation between the two variables can be utilized to create the map of sky brightness over Greater Bandung area. From this map, it was found that majority (~90%) of the existing tourism destinations, hotels, and resorts in the region belong to the third class of astro-tourism site where only bright celestial objects are observable. Better locations (class 2) can be found in Ciwidey, Cikole-Ciater, and Padalarang regions. [ABSTRACT FROM AUTHOR]

Published
2019
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