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All Journal Jurnal Dinamis Jurnal Penelitian Fisika dan Aplikasinya (JPFA) TELKOMNIKA (Telecommunication Computing Electronics and Control) Jurnal Fisika Unand Emerging Science Journal Jurnal Penelitian Pendidikan IPA (JPPIPA) Jurnal Hilirisasi IPTEKS (JHI) Jurnal Ilmu Fisika INTEGRITAS : Jurnal Pengabdian BERNAS: Jurnal Pengabdian Kepada Masyarakat Warta Pengabdian Andalas: Jurnal Ilmiah Pengembangan Dan Penerapan Ipteks Makara Journal of Science Indonesian Journal of Community Empowerment and Service
Mutya Vonnisa
Jurusan Fisika Universitas Andalas
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Journal : Makara Journal of Science

 1 
Seasonal and Diurnal Variations of Lightning Activity Over West Sumatra and Its Correlation with Precipitation Type Saufina, Elfira; Marzuki, Marzuki; Vonnisa, Mutya; Hashiguchi, Hiroyuki; Harmadi, Harmadi
Makara Journal of Science Vol. 22, No. 2
Publisher : UI Scholars Hub

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Seasonal and diurnal variations of lightning activity over West Sumatra have been investigated using observations of Tropical Rainfall Measuring Mission–Lightning Imaging Sensor (TRMM–LIS) over a 16-year period. This study also used TRMM 3B43 and 2A25 data to observe the correlation between lightning activity with rainfall and precipitation type. Results show that lightning occurs more frequently over land than over ocean and coastal areas, in contrast to total rainfall, which is higher over ocean and coastalareas. The lightning pattern is similar to the convective rainfall (particularly deep convective) pattern, which indicates that the majority of lightning in West Sumatra is associated with deep convective rain. The lightning intensity in Indonesia during the convection period, namely, December–January–February and September–October–November, is higher than that during other periods. The diurnal cycle of lightning coincides with the diurnal cycle of cloud migration from the ocean to in land Sumatra, as reported in previous research. Lightning and deep convective precipitation are dominant during the day and evening (16.00–20.00 Local Standard Time [LST]), particularly over land. Stratiform precipitation occursmore frequentlyfrom afternoon to early morning (16.00–04.00 LST) over landand at 00.00–12.00 LST over the ocean.
Statistical Properties of Cloud Propagation over Sumatra during CPEA-I Rahayu, Aulya; Marzuki,; Vonnisa, Mutya
Makara Journal of Science Vol. 20, No. 4
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Cloud propagation over Sumatra and the surrounding area (10°S-10°N, 70°-120°E) during the Coupling Processes in the Equatorial Atmosphere-I (CPEA-I) campaign (10 April to 9 May 2004) was tracked using brightness temperature (Tb) data from the GOES-9 satellite. The cloud tracking was based on three-dimensional data with a threshold of Tb < 210 K. During the campaign, westward-moving clouds were more dominant than eastward-moving systems, with a ratio of approximately 4:1. This characteristic coincided with the dominant easterly wind aloft. Most clouds propagated with a speed varying between 4 and 35 m/s, with a mean value of 13.7 m/s. If the westward and eastward propagations were separated, the average duration, speed, and span of the westward (eastward) moving clouds are 7.7 (5.8 h), -14.5 (9.8 m/s), and 435.5 (187.1 km), respectively. The characteristics of cloud propagation during the CPEA-I were influenced by environmental factors such as relative humidity, temperature, the vertical movement of air, and wind shear. Such factors interacted with the inactive and active phases of the Madden-Julian Oscillation.
Estimation of Raindrop Size Distribution Parameters Using Rain Attenuation Data from a Ku-Band Communications Satellite Indrayani, Wira; Marzuki,; Vonnisa, Mutya
Makara Journal of Science Vol. 20, No. 3
Publisher : UI Scholars Hub

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The rain attenuation of down-link radio wave signals from the Superbird-C satellite and surface rainfall data have been used to estimate the parameters of exponential raindrop size distribution (DSD) at Koto Tabang (100.32 °E, 0.20 °S), West Sumatra, Indonesia. Prior to analyzing the measured data, the ability of the method to recover the parameters of known DSDs from which the samples were taken was examined. It was found that the method can accurately retrieve the input parameter of the sample. Only six case studies are presented here, so the results are representative rather than definitive. The method successfully estimated the DSD parameters of a stratiform case with steady intensity and deep convective rains of a short duration. This can be inferred from the small difference between the parameters derived from rain attenuation data and those derived from a 2D video disdrometer. The poor performance of the method was observed for a stratiform case with strong rain intensity fluctuation and shallow convective rains with very low rain top height. This phenomenon is probably due to the bias that may be inherent in the estimation of specific rain attenuation, such as the assumption of a constant path length throughout the rain.
Co-Authors Adrial, Rico Afdal Afdal Afdal Afdal Afdhal Muttaqin Ahmad Fauzi Pohan Ahmad Rizqy Shubri Ahmad Zul Amal Zaini Alimin Mahyudin Ardian Putra Ariani, Silvi Arif Budiman Arif Budiman Astuti Astuti - Astuti Astuti Astuti Astuti Astuti Astuti Aulya Rahayu Aulya Rahayu, Aulya Ayu Putri Ningsih Ayu Putri Ningsih Ckhotimah, Husnul Dahyunir Dahlan Damayanti, Elok Dea Kurnia Harysandi Dedi Mardiansyah Dian Fitriyani Dian Milvita Dwi Pujiastuti Dwi Pujiastuti Dwi Puryanti Eldiani Arifya Elfira Saufina Elistia Liza Namigo, Elistia Elvaswer Elvaswer Fadilla Monica Fani Anjelina Feriska Handayani Irka, Feriska Handayani Geby Sri Ayu Oktavia Hanifah Azzaura Musyayyadah Hapsoro, Cahyo A. Harmadi Harmadi Harmadi Harmadi Helmi Yusnaini Helmi Yusnaini Hiroyuki Hashiguchi Hiroyuki Hashiguchi Hiroyuki Hashiguchi Hiroyuki Hashiguchi Hiroyuki Hashiguchi Hiroyuki Hashiguchi, Hiroyuki Husnul Ckhotimah Imam Taufik Imam Taufiq Imam Taufiq Indrayani, Wira Iqbal Ramadhan Iqbal Ramadhan L. Luini Lisna Meylani M. Ali Shafii Marzuki Marzuki Marzuki Marzuki Marzuki Marzuki Marzuki, Meqorry Yusfi Meri Yoseva Mohammad Ali Shafii Mora Mora Muhammad Arif Muhammad Arif Muhammad Kahfi Muhammad Kahfi Muldarisnur, Mulda Musyayyadah, Hanifah Azzaura Muzirwan Muzirwan Naela Amalia Zulfa Naela Amalia Zulfa Nini Firmawati Nor Azlan Mohd Aris Novia Dwi Agusri Novita, Shania Ellens Nurdiana Nurdiana Nurul Annisa Nurul Hasanah Pakhrur Razi Rahmat Rasyid Rahmat Rasyid Ramacos Fardela Ramadani Safitri Ramadhan, Ravidho Ravidho Ramadhan Ravidho Ramadhan Ravidho Ramadhan Rini Oktaviani Safitri, Ramadani Saufina, Elfira Shania Ellens Novita Shimomai, Toyoshi Sholihun, Sholihun Solly Aryza Sri Handani Sri Oktamuliani Sucy Lestari Wirma Sugeng Nugroho Suryanto, Wiwit Syarifatul Ulfah Toyoshi Shimomai Toyoshi Shimomai Toyoshi Shimomai Toyoshi Shimomai Trengginas Eka Putra Sutantyo Usna, Sri Rahayu Alfitri Veithzal Rivai Zainal Wira Indrayani Yanfatriani, Elsa Yoci Darwita Putri Yoseva, Meri Yusnaini, Helmi Zulfi Zulfi Zulfi Zulkifli Lubis