FENOMENA SPORADIC E FREKUENSI 5.2 MHZ PADA KONDISI SOLAR MINIMUM TAHUN 2019
Abstract
High Frequency (HF) Communication is very dependent on the condition of the ionosphere which changes conditions over time. 2019 is a year with minimum solar conditions marked by a lack of solar cold spots. This condition can cause interference with the propagation path of radio waves in the ionosphere. In this research, a report on HF wave propagation observations is presented using a retrospective method to determine the sporadic E intensity at minimum solar conditions. Data retrieval is done by beacon / sounding system between radio stations by using a low power signal processing software that is Weak Signal Propagation Report (WSPR). Observations were made by building 2 radio stations in Surabaya (7.30S, 112.78E) as transmitter and radio stations in Jombang (7.61S, 112.31E) as receiver. Observations were carried out for one year from November 2018 until October 2019. During the observation process, a frequency of 5.2 MHz is used and the results showed that there were several days that described a favorable phenomenon for HF communication at close range (below 500 km), namely Sporadic E. During the observation it was obtained 8 times the Sporadic E phenomenon that is quite long with a time span of occurrence between 1 hour to 3 hours. Overall observations show that in May to August is the time when most Sporadic E phenomena occur. So from this research, it can be concluded that the sporadic E phenomenon can still occur when the sun enters the minimum solar conditions.
Keywords: HF, Solar Minimum, Ionospher, Sporadic E
Komunikasi High Frequency (HF) sangat bergantung pada kondisi ionosfer yang mengalami perubahan kondisi dari waktu ke waktu. Tahun 2019 merupakan tahun dengan kondisi solar minimum yang ditandai dengan minimnya nilai titik dingin matahari. Kondisi ini dapat mengakibatkan gangguan pada jalur propagasi gelombang radio di lapisan ionosfer. Pada penelitian ini, disajikan laporan pengamatan propagasi gelombang HF menggunakan metode retrospektif untuk mengetahui intensitas sporadic E saat kondisi solar minimum. Pengambilan data dilakukan dengan sistem beacon / sounding antar stasiun radio dengan memanfaatkan software pengolahan sinyal daya rendah yaitu Weak Signal Propagation Report (WSPR). Pengamatan dilakukan dengan membangun 2 stasiun radio yang berada di Surabaya (7.30S, 112.78E) sebagai pemancar dan stasiun radio di Jombang (7.61S, 112.31E) sebagai penerima. Pengamatan dilakukan selama satu tahun dari bulan November 2018 sampai dengan bulan Oktober 2019. Pada proses pengamatan digunakan frekuensi 5.2 MHz dan hasilnya menunjukkan terdapat beberapa hari yang menggambarkan fenomena menguntungkan untuk komunikasi HF jarak dekat (dibawah 500 km) yaitu Sporadic E. Selama pengamatan telah didapatkan 8 kali fenomena Sporadic E yang cukup lama dengan rentang waktu kejadian antara 1 jam hingga 3 jam. Secara keseluruhan hasil pengamatan menunjukkan bahwa pada bulan Mei hingga bulan Agustus merupakan waktu paling banyak terjadinya fenomena Sporadic E. Sehingga dari penelitian ini dapat disimpulkan bahwa fenomena sporadic E masih bisa terjadi ketika matahari memasuki kondisi solar minimum.
Kata kunci: HF, Solar Minimum, Ionosfer, Sporadic E
Full Text:
PDFReferences
ITU-R, “Final Acts WRC-12”, World Radiocommunication Conference, 2012.
ITU-R, “Radio Regulation (RR)”, Article 5, Frequency Allocations, 2012.
Law of The Republic of Indonesia On Telecommunication No.36 year 1999, Article 33, 1999.
ITU-R, “Method for the prediction of the performance of HF circuits”, Recommendations P. 533-13, 2015.
Lane, G., “Signal-to Noise Prediction Using VOACAP - User’s Guide”, Rockwell-Collins, Cedar Rapids, Iowa, 2001.
Zolesi Bruno, Cander R Ljiljana, “Ionospheric Prediction and Forecasting”, Springer Geophysics, p.44, p.185, 2014.
Walden C Marcus, “Comparison of propagation prediction and measurements for midlatitude HF near-vertical incidence sky wave link at 5 MHz”, Radio Science, vol. 47, RSOL09, 2012.
ITU-R, “Final Acts WRC-15”, World Radiocommunicati on Conference, 2015.
A. C. Moral, E. Ceren, K. Eyiguler, and Z. Kaymaz, “Sudden Ionospheric Disturbances and Their Detection Over Istanbul”, Recent Advances in Space Technologies , pp. 765–768, 2013.
O. N. Sherstyukov, A. D. Akchurin, and R. O. Sherstyukov, “ScienceDirect Determination of Sporadic E radio wave propagation parameters based on vertical and oblique sounding”, Adv. Sp. Res., vol. 56, no. 6, pp. 1169–1176, 2015.
E. M. Warrington et al., “Near real-time input to a propagation model for nowcasting of HF communications with aircraft on polar routes”, pp. 1048–1059, 2016.
S. I. Gburi, “Seasonal variation of Ionospheric E Sporadic Layer at Mid Latitude Region during Solar Cycle 24”, International Journal of Science and Research (IJSR), vol. 7, no. 1, pp. 453–459, 2018.
M. I. Savchenko, P. V. Vatagin, V. P. Lazutkov, D. V. Skorodumov, I. V. Kudryavtsev, and Y. E. Charikov, “The two solar flares diagnostics based on the soft X-ray emission recording”, St. Petersbg. Polytech. Univ. J. Phys. Math., vol. 3, no. 3, pp. 292–297, 2017.
D. P. Grubor, and D. M. Åuli, and V. Åigman, “Classification of X-ray solar flares regarding their effects on the lower ionosphere electron density profile”, Ann. Geophys., vol. 26, no. 7, pp. 1731–1740, 2008.
ITU-R, Recommendation ITU-R F.339-8, “Pitawidths , signal-to-noise ratios and fading allowances in HF fixed and land mobile radiocommunication systems F Series Fixed service”, vol. 8, pp. 2–10, 2013.
K. Yusupov, A. Akchurin, and V. Frolov, “Sporadic E-layer and Powerful HF-Radio Emission”, Russ. Open Conf. Radio Wave Propag., vol. 1, no. 18, pp. 285–288, 2019.
DOI: http://dx.doi.org/10.20527/klik.v7i2.314
Copyright (c) 2020 KLIK - KUMPULAN JURNAL ILMU KOMPUTER
This work is licensed under a Creative Commons Attribution 4.0 International License.
This work is licensed under a Creative Commons Attribution 4.0 International License. View My Stats