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KESETARAAN KECEPATAN GELOMBANG KEJUT SEMBURAN RADIO MATAHARI TIPE II DAN LONTARAN MASSA KORONA - Suratno; Gunawan Admiranto; Santi Sulistiani; Johan Muhamad
Jurnal Sains Dirgantara Vol 6, No 2 (2009)
Publisher : Lembaga Penerbangan dan Antariksa Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1329.204 KB)

Abstract

Penelitian tentang keterkaitan semburan radio tipe II, lontaran massa korona (CME) dan ledakan matahari, dihasilkan bahwa kecepatan gelombang kejut yang diturunkan dari pergeseran frekuensi semburan radio matahari tipe II menunjukkan kesesuaian yang cukup baik dengan kecepatan CME. Kecepatan gelombang kejut yang tinggi akan melewati tebal lapisan korona dalam waktu yang pendek dan sebaliknya, dibuktikan dari hubungan antara kecepatan CME dan durasi semburan radio pada rentang frekuensi tertentu (30 MHz – 20 MHz) berbentuk hubungan eksponensial ΔТII (menit) = 8.284e-0.0008Vcme dengan koefisien korelasi sebesar 0.66. Korelasi linier antara kecepatan gelombang kejut (Vs) dan kecepatan CME berbentuk Vcme (km/s) = 0.581Vs+229.4, dengan koefisien korelasi 0.64 dan hanya berlaku bila Vs ≥ 362 km/s. Di samping itu diperoleh juga bahwa korelasi intensitas SXR terhadap kecepatan gelombang kejut lebih baik bila dibandingkan dengan korelasi terhadap kecepatan CME disebabkan lokasi ledakan yang dekat dengan sumber gelombang kejut. Kata kunci: Ledakan matahari, Semburan radio matahari tipe II, Lontaran massa korona.
ANALISIS SEMBURAN RADIO MATAHARI TIPE II SEBAGAI PREKURSOR KEMUNGKINAN TERJADINYA BADAI MAGNET BUMI - Suratno; Santi Sulistiani
Jurnal Sains Dirgantara Vol 7, No 2 (2010)
Publisher : Lembaga Penerbangan dan Antariksa Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (7068.417 KB) | DOI: 10.30536/j.jsd.2010.v7.a1119

Abstract

The solar flare, type II solar radio bursts and Coronal Mass Ejection (CME) are the serial phenomena of the sun which have a closed association. The occurence of type II solar radio bursts is triggered by passing of shock wave and is showing the ejection of plasma and magnetic fields. The shock wave or CME travelling toward the earth’s upper atmosphere can lead to the occurence of geomagnetic storm. Since the bursts propagation mechanism is by means of electromagnetic radiation and reaches the earth within 8 minutes, the shock wave or CME will reach the earth within 40 to 80 hours or even it is exceeding 5 days, hence, the type II bursts can be used as an early indicator information of the possibility incident of the geomagnetic storm. This investigation is carried out by analysing the travel time of shock wave which is determined from the dynamic spectra of type II solar radio bursts and the onset time of the geomagnetic storm. This travel time then is compared to the difference between start time of type II bursts and the instant of minimum Dst (Disturbance storm time). This analysis is supported by the data of active region position on the solar disk as a source of bursts and the direction of interplanetary magnetic field. Keyword: Solar flare, Type II solar radio bursts, Geomagnetic storm
Co-Authors - Suratno Gunawan Admiranto Johan Muhamad