Studies On Large Geomagnetic Storms During Solar Cycles 22-23  

Oleh:

Saroso, Sarmoko

Jenis: Article from Journal - ilmiah nasional
Dalam koleksi: Jurnal Sains Dirgantara vol. 7 no. 1 (Dec. 2009), page 212-218.
Topik: Geomagnetic stroms; Dst index; Solar cycles; Main phase; Recovery phase.

Ketersediaan

Perpustakaan Pusat (Semanggi) Nomor Panggil: SS49.1 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

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Isi artikel

The set of 158 intense geomagnetic storms associated with Dst index decreases of more than 100 nT, observed during solar cycle 22 and 23. In the covers whole period of solar cycle 22 and maximum part of solar cycle 23, have been analyzed. The selected storms events have been compiled and their various characteristics features as well as seasonal and solar cycle dependence have been discussed. We find yearly occurrence of intense storms are strongly correlated with 11-year sunspot cycle, but no significant been found. It is also found that best initial phase duration lies between 0 – 2 hours. The main and recovery phase duration’s lies between 7 – 12 hours and 2 – 3 days respectively. The seasonal shows a cyclic variation peaking around April and October months.

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