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Дата изменения: Wed Mar 21 07:28:06 2012 Дата индексирования: Sun Apr 10 01:19:54 2016 Кодировка: Поисковые слова: m 65 |
Coronal
Mass Ejections (CMEs) -- essential restructuring and large-scale disturbances
of the global solar magnetosphere (GSM).
Dimmings
(transient coronal holes) -- regions of strong depletion in soft X-ray
and EUV emission following CMEs; several hours
(e.g.,
Rust, 1983; Sterling and Hudson, 1997; Hudson and Webb, 1997; Thompson
et al., 1998, 1999; Zarro et al., 1999; Hudson and Cliver, 2001).
Coronal (EIT) wave --
a bright front propagating before developing dimmings; few hundreds km/s
(e.g.,Thompson
et al., 1998, 1999; Gopalswamy and Thompson, 2000; Delannee, 2000; Biesecker
et al., 2002).
Previous SOHO studies:
Events of mainly 1997-1998 -- comparatively simple GSM -- more or less isotropic or symmetrical dimmings and coronal waves extending throughout a significant part of the disk (e.g., Thompson et al., 1998, 1999, 2000; Zarro et al., 1999; Klassen et al., 2000; Warmuth et al., 2001).
1997.05.12:
Region
; Fixed
difference
--
Twin dimmings (Thompson
et al., 1998,1999; Zarro et al., 1999).
-- Dimmings of the
transequatorial interconnecting loops (Khan and Hudson, 2000; Pohjolainen
et al., 2001).
-- Widely extending
dimming patches (Wang et al., 2002).
-- Reflection
and refraction of coronal waves under interaction with coronal holes and
active regions (Wang, 2000; Ofman and Thompson, 2002).
Present study:
Events of 2000-2001 -- complicated GSM -- large-scale (global) dimmings have a pronounced anisotropic character and extend along some narrow lengthy structures (channels).