Dampak Flare Tanggal 21 dan 25 Agustus 1998 pada Medan Magnet Bumi dan Lapisan F2 Ionosfer  

Oleh:

Suhartini, Sri

Jenis: Article from Journal - ilmiah nasional
Dalam koleksi: Majalah Sains dan Teknologi Dirgantara (Fulltext) vol. 1 no. 2 (Apr. 1999), page 34-43.
Topik: Geomagnetic

Ketersediaan

Perpustakaan Pusat (Semanggi) Nomor Panggil: MM32.1 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

Lihat Detail Induk

Isi artikel

Impact of two flare events on August 21 (M9.0/2B) and 25 (X1.0/3B) 1998, studied for knowing their influence on geomagnetic field, ionospheric F layer and MUF (Maximum Usable Frequency) of the HF communication. The data used on this paper are geomagnetic H components of Biak (1 .10 S, 136.05° E), critical frequency of ionospheric F2 layer (foF2) over Sumedang (6.5° S, 107.47° E) and MUF for HF communication between Manado (1.45° N, 124.75° E) and Sumedang from 21 to 27 August 1998. The flare on August 21 caused active magnetic storm 23 hours after the event, caused by shock waves which accompany the flare. This magnetic storm followed by the decrease of foF2 and MUF Manado-Sumedang of about 25% and 20%, respectively. The flare on August 25 caused the decrease of foF2 of about 25 % only 3 hours after. The reason of this disturbance is the increase of the absorption in ionospheric F region. Magnetic storm commenced on August 26 (active to minor storm), followed by the ionospheric disturbance showed as 10 % and 20% reduction, of foF2 and MUF respectively. Major storm on August 27 caused by shock waves which accompany the flare, but the effect cannot be explained due to lack of data since the observation stopped on 09.45.

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