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space weather disturbances and their geoeffectiveness during solar cycle 23 and 24
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نویسنده
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singh sham
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منبع
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پژوهش فيزيك ايران - 2024 - دوره : 24 - شماره : 3 - صفحه:117 -133
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چکیده
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We present the findings of a study of the sequence of solar activity that eventually resulted in 80 large geomagnetic storms (distinguished by minimum dst -100nt to -200nt), 11 super geomagnetic storms (dst -200nt to -300nt), and 6 super great geomagnetic storms (dst -300nt) that occurred between 1996 and 2012. large storms were discovered to be mostly caused by solar flares (m- and x-class), while corotating interaction region (cir) was also a significant contributor to several of these storms. during the peak and declining phases of solar cycle 23, all extremely powerful storms were observed (2000-2004). it has been noted that coronal mass ejections (cmes) and flares were always related with super and super tremendous storms (100%). m-class and x-class flares frequently accompany superstorms associated to cmes. it is observed that 66.6% (4/6) super great geomagnetic storms (dst ≤ -300nt) were associated with cmes and solar flares. the number of storms related to x-class flares or cmes were 50% (3/6). x-class flare/cmes are found to be responsible for super geomagnetic storms.
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کلیدواژه
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solar flares ,interplanetary magnetic field ,coronal mass ejections ,geomagnetic storms
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آدرس
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chandigarh engineering college, india
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پست الکترونیکی
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shamrathore@yahoo.com
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space weather disturbances and their geoeffectiveness during solar cycle 23 and 24
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Authors
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singh sham
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Abstract
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we present the findings of a study of the sequence of solar activity that eventually resulted in 80 large geomagnetic storms (distinguished by minimum dst -100nt to -200nt), 11 super geomagnetic storms (dst -200nt to -300nt), and 6 super great geomagnetic storms (dst -300nt) that occurred between 1996 and 2012. large storms were discovered to be mostly caused by solar flares (m- and x-class), while corotating interaction region (cir) was also a significant contributor to several of these storms. during the peak and declining phases of solar cycle 23, all extremely powerful storms were observed (2000-2004). it has been noted that coronal mass ejections (cmes) and flares were always related with super and super tremendous storms (100%). m-class and x-class flares frequently accompany superstorms associated to cmes. it is observed that 66.6% (4/6) super great geomagnetic storms (dst ≤ -300nt) were associated with cmes and solar flares. the number of storms related to x-class flares or cmes were 50% (3/6). x-class flare/cmes are found to be responsible for super geomagnetic storms.
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