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  • characteristics of dh type ii bursts, cmes and flares with respect to the acceleration of cmes

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 1292
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     a detailed investigation on dh-type-ii radio bursts recorded in deca-hectometer (hereinafter dh-type-ii) wavelength range and their associated cmes observed during the year 1997–2008 is presented. the sample of 212 dh-type-ii associated with cmes are classified into three populations: (i) group i (43 events): dh-type-ii associated cmes are accelerating in the lasco field view (a>15 m s−2); (ii) group ii (99 events): approximately constant velocity cmes (−15<a<15 m s−2) and (iii) group iii (70 events): represents decelerating cmes (a<−15 m s−2). our study consists of three steps: (i) statistical properties of dh-type-ii bursts of group i, ii and iii events; (ii) analysis of time lags between onsets of flares and cmes associated with dh-type-ii bursts and (iii) statistical properties of flares and cmes of group i, ii and iii events. we found statistically significant differences between the properties of dh-type-ii bursts of group i, ii and iii events. the significance (p a ) is found using the one-way anova-test to examine the differences between means of groups. for example, there is significant difference in the duration (p a =5%), ending frequency (p a =4%) and bandwidth (p a=4%). the accelerating and decelerating cmes have more kinetic energy than the constant speed cmes. there is a significant difference between the nose height of cmes at the end time of dh-type-iis (p a ≪1%). from the time delay analysis, we found: (i) there is no significant difference in the delay (flare start—dh-type-ii start and flare peak—dh-type-ii start); (ii) small differences in the time delay between the cme onset and dh-type-ii start, delay between the flare start and cme onset times. however, there are high significant differences in: flare duration (p a =1%), flare rise time (p a =0.5%), flare decay time (p a =5%) and cmes speed (p a ≪1%) of group i, ii and iii events. the general lasco cmes have lower width and speeds when compared to the dh cmes. it seems there is a strong relation between the kinetic energy of cmes and dh-type-ii properties.

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