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"hanges in the daily variation of H component due to magnetic storms with a duration of hours to days is the space weather information is very important for further decision making for the user. Activity disturbance caused wave/influx of energetic particles that arise through the solar wind, can solve the earth's magnetic field is strong at very short intervals. Changes in the daily variation H component is generally an increase or decrease up to hundreds of nano tesla from a stable ondition. In the paper be discussion analysis of changes in the daily variation of H component magnet during magnetic storms using double Fourier series. In order to obtain information from changes daily variation of H component during magnetic storms through data from monitoring stations geomagnetic Biak and Tangerang. The results of analysis obtained 3 times a magnetic storm events occur fluctuation SSG to daily variations in H component in Tangerang April 2001, in order 171nT,-and-125nT 221nT. Magnetic storm SSC 28 April 2001 showed changes occur daily variation of H component in the station at Biak -467nT and 1124nT."

"Periodic magnetic storms are those related to reccurent coronal hole events within a period of one solar rotation. There are still few studies on successive periodic magnetic storm. In this paper, we discuss the nature of the amplitude of the periodic magnetic storms within the solar cycle 20,21,22, and 23. The periodic nature of solar wind ( 27 days) occured on descending phase of solar cycle 22 also caused a reccurent geomagnetic disturbance. The disturbance developed into a geomagnetic storm in the first (27 days) and the ninth rotation. The geomegnetic disturbances with period 27 and 13.5 days are both significant at the low latitude while the period of 30 days are more dominant at the high latitude. That mean, from two flows of high velicity plasmas, only one that higher contribution on the occurence of geomagnetic disturbance accompanied by high intensity southern Bz field."

"Telah dikaji indikasi perubahan iklim, khususnya variasi atau perubahan curah hujan bulanan yang terjadi di Kabupaten Subang dan Tasikmalaya. Berbasis kepada data curah hujan bulanan yang dihasilkan oleh Badan Meteorologi dan Geofisika (BMG) selama 25 tahun pengamatan (1980-2005), di atas wilayah tersebut dibuatlah kelompok Zona Prediksi Iklim (ZPI) sesuai kriteria menurut BMG. Hasilnya menunjukkan bahwa hampir semua ZPI mengalami tren positif. Walaupun didapat pola Monsunal dengan siklus utama sekitar 12 bulanan, namun terdapat perbedaan jumlah curah hujan ratarata antara Kabupaten Subang dan Tasikmalaya. Pada semua wilayah terdapat perbedaan intensitas curah hujan dalam tiap bulan, terutama selama musim hujan (November-April). Wilayah Subang ZPI 40 dan ZPI 46 mempunyai curah hujan antara 300 hingga 450 mm pada saat musim hujan. Sementara ZPI 33, ZPI 41 dan ZPI 42 mempunyai curah hujan antara 150 hingga 300 mm. Sedangkan wilayah Tasikmalaya, umumnya memiliki curah hujan antara 200-400 mm pada semua wilayah ZPI."

"Makalah ini, membahas propagasi gelombang radio dengan frekuensi 10,200 MHz dan 15,800 MHz pada sirkit komunikasi radio Bandung-Watukosek dan Bandung- Pontianak. Tujuannya untuk mendapatkan syarat batas frekuensi kritis lapisan E/Es dan lapisan F untuk memastikan pemantulan oleh lapisan E/Es. Simulasi menggunakan rumus secant dengan asumsi radius Bumi di ekuator (6378,388 km) dan jarak sirkit Bandung-Watukosek (524 km) dan Bandung-Pontianak (788 km), maka syarat batas frekuensi kritis tersebut diperoleh. Selanjutnya, pembahasan yang dilakukan menghasilkan kesimpulan: (1) kondisi propagasi lapisan E/Es dapat diketahui dari kontak komunikasi radio antara Bandung-Watukosek dan Bandung- Pontianak serta data foE/foEs dan foF2 yang diperoleh dari pengamatan ionosonda di SPD Tanjungsari dan SPD Pontianak, (2) syarat batas frekuensi kritis lapisan E/Es dan lapisan F untuk sirkit Bandung-Watukosek dengan frekuensi 10,200 MHz adalah foE/foE 4 MHz dan foF2  6MHz dan untuk frekuensi 15,800 MHz adalah foE/foE 6 MHz dan foF2  9 MHz, (3) syarat batas frekuensi kritis lapisan E/Es dan lapisan F untuk sirkit Bandung-Pontianak dengan frekuensi 10,200 MHz adalah foE/foE 3 MHz dan foF2  4 MHz dan untuk frekuensi 15,800 MHz adalah foE/foE 5 MHz dan foF2  7 MHz, dan (4) statistik kejadian propagasi lapisan E/Es untuk sirkit Bandung-Watukosek dan Bandung-Pontianak dapat dijadikan indikasi kemunculan lapisan E atau E Sporadis di lokasi antara ketiga stasiun radio tersebut."

"Geomagnetic disturbances are closely related with the interplanetary magnetic field, particularly the southward component (negative Bz), since such condition can lead to the energy tranfer from the solar wind into the Earth’s magnetosphere. The energy transfer can cause disturbance in geomagnetic field, which is represented by disturbance index Dst. The good correlation between the minimum values of Bz and Dst means that the stronger the magnetic field can lead to the stronger disturbance. However, the minimum of both parameter do not occur simultaneously. From analysis of 41 geomagnetic storms with Dst ≤ -30 nT, in general, the time delay between Bz and Dst is two hours, which Bz reach minimum two hour before the Dst. It represent the time that required by the disturbance to travel from magnetopause to the Earth. Keywords: Geomagnetic disturbance, Interplanetary magnetic field"

"Perumahan di daerah perkotaan telah meningkat secara dramatis seiring dengan pertumbuhan populasi yang besar dan meningkatnya arus urbanisasi. Laju urbanisasi menurut Proyeksi Penduduk Indonesia 2010 - 2035, Statistik Indonesia tahun 2013, dalam 25 tahun ke depan akan meningkat rata-rata sebesar 72,5%. Arus urbanisasi menyebabkan berbagai macam permasalahan perkotaan salah satunya adalah pemukiman informal yang mayoritas berada di Kampung. Pemerintah Jakarta telah membuat kebijakan tentang pelaksanaan Kampung dan Penataan Masyarakat di Jakarta khususnya (Kepgub 878/2018). Tujuan dalam penelitian mengkaji implementasi kebijakan yang terkait dengan Kampung Kota. Selanjutnya menganalisis perubahan luas permukiman informal melalui analisis spasial (SIG) dengan Citra Resolusi Satelit Tinggi dalam kurun waktu 2010, 2016, dan 2020. Penelitian menggunakan pendekatan kualitatif dengan wawancara secara mendalam, observasi lapangan, dan studi kepustakaan.

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Housing in urban areas has increased dramatically along with massive population growth and increasing urbanization flow. The pace of urbanization according to the Indonesia Population Projection 2010-2035, Statistics Indonesia (2013) in the next 25 years will increase by an average of 72.5%. One of the urban problems by that circumstance is informal settlement that occur in Kampung. Jakarta government has created a policy about Kampung and Community arrangement implementation in Jakarta particularly for specific district (Kepgub 878/2019). The purpose of this research are to examine the implementation of policies related to Kampung and analyze the changes of informal settlements through spatial analysys (GIS) with high resolution sattelite imagery in 2010, 2016, and 2020. The research used a qualitative approach with indepth interview, observation, and literature review."

"The research of soil structure stability at Sukuh Temple was carried out in order to seekthe answer to geotechnical and geological issues of the temple?s environment. This NationalHeritage Site, which,was built around 14th century AD,has some environment disturbances causedby developing settlement area, tourism, and mining. Furthermore, theexistence of mining activityat the site as shown by the tunnels and caves in the underground of the Temple?s area, couldmakepotentiall triggers for landslide in the future of the temple.Considering the major influence of mining activity in the area of this site, the soilstructure study is necessery for focusing to assess the threats caused by this mining activity in theTemple?s area. Geotechnical survey and geological survey condition have been done to collectdata for this study. The survey were also been done for identifying other aspect such as earthquakein surrounding area of the Temple."

"Kabupaten Bekasi dikenal sebagai salah satu wilayah lumbung padi di Jawa Barat. Selain sebagai lumbung padi, Kabupaten Bekasi juga dikenal sebagai salah satu sentra industri. Namun, pesatnya industri di wilayah tersebut menyebabkan adanya perubahan penggunaan lahan basah untuk kepentingan industri dan permukiman. Perubahan lahan basah menjadi lahan terbangun mempengaruhi posisi Kabupaten Bekasi sebagai wilayah lumbung padi. Konversi lahan basah dipengaruhi oleh 3 aspek yaitu politik, sawah, dan demografi. Aspek politik terkait dengan kebijakan yaitu RTRW, aspek sawah terkait luas sawah, dan aspek demografi terkait jumlah penduduk. Untuk mengetahui swasembada beras di Kabupaten Bekasi, dilakukan perhitungan produksi beras dengan kebutuhan beras yang diperoleh dari data luas sawah dan jumlah penduduk. Dengan menganalisis luas sawah, produksi beras, dan kebutuhan beras, maka dihasilkan perubahan lahan basah tidak mempengaruhi posisi Kabupaten Bekasi sebagai wilayah lumbung padi. Tercatat ada 13 kecamatan yang pada tahun 2002 dan 2011 mengalami surplus beras yaitu Kecamatan Cibarusah, Bojongmangu, Cikarang Timur, Kedungwaringin, Karangbahagia, Tarumajaya, Tambelang, Sukawangi, Sukatani, Sukakarya, Pebayuran, Cabangbungin, dan Muaragembong. Tercatat ada 5 kecamatan yang pada tahun 2002 dan tahun 2011 mengalami defisit beras yaitu Kecamatan Serang Baru, Cikarang Selatan, Cikarang Utara, Cikarang Barat, dan Tambun Selatan. Tercatat ada 4 kecamatan yang mana pada tahun 2002 mengalami surplus beras namun defisit beras pada tahun 2011 yaitu Kecamatan, Setu, Cibitung, Tambun Utara, dan Babelan.

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Bekasi Regency is one of the granary areas in West Java. Also, Bekasi Regency known as one of the industrial centers. However, the rapid industry in the region led to a change in the use of wetlands for the benefit of industry and settlement. Changes in wetlands to land up influencing Bekasi Regency position as a granary areas. Conversion of wetlands affected by the 3 aspects of politics, rice, and demographics. Political aspects related to the spatial policy, aspects related to paddy rice area, and aspects related to population demographics. To find rice selfsufficiency in Bekasi Regency, calculation rice production to the needs of the data obtained from the rice area and population. By analyzing the rice area, rice production, and rice needs, hence resulting wetland changes do not affect the position of the Bekasi Regency as area granary. Noted there are 13 districts in 2002 and 2011 had a surplus of rice that is District Cibarusah, Bojongmangu, Cikarang Timur, Kedungwaringin, Karangbahagia, Tarumajaya, Tambelang, Sukawangi, Sukatani, Sukakarya, Pebayuran, Cabangbungin, and Muaragembong. Noted there are 5 districts in 2002 and in 2011 had a deficit of rice namely Serang Baru, Cikarang Selatan, Cikarang Utara, Cikarang Barat, and Tambun Selatan. Noted there are four districts which in 2002 had a surplus of rice but the rice deficit in 2011 the District Setu, Cibitung, Tambun Utara, and Babelan."

"(software) of the IR1 (Infrared) and the calibration (CAL), it can be known when the dry season start based on the cloud top temperature and the cloud coverage of Indonesia. The results of the monthly MTSAT data in two years observations (period 2006 to 2007), shows that the dry season beginning of Indonesia is in June, July, August, September and October started from the eastern part of Indonesia to the western part of Indonesia especially the South Sumatera. Further by using Standard Presipitation Index (SPI) methods in June, July, August, September and October 2007 (five months), gives some information that the most experiencing drought areas in Indonesia especially in the eastern part of Indonesia are July and August. Keyword:Rainfall, MTSAT, drought "