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  • distinctions between the characteristics of before and after dh cmes associated flares

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    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
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    • شماره تماس دبیرخانه رویداد: -
    distinctions between the characteristics of before and after dh cmes associated flares
    a detailed analysis of characteristics of coronal mass ejections and flares associated with deca-hectometer wavelength type-ii radio bursts (dh-cmes and dh-flares) observed in the period 1997–2008 is presented. a sample of 62 limb events is divided into two populations known as after-flare cmes (af-cmes) and before-flare cmes (bf-cmes) based on the relative timing of the flare and cme onsets. on average, af-cmes (1589 km s−1) have more speed than the bf-cmes (1226 km s−1) and the difference between mean values are highly significant (p∼2%). the average cme nose height at the time of type-ii start is at larger distance for af-cmes than the bf-cmes (4.89 and 3.84ro, respectively). we found a good anti-correlation for accelerating (ra=−0.89) and decelerating (rd=−0.78) af-cmes. in the case of decelerating bf-cmes, the correlation seems to be similar to that for decelerating af-cmes (rd=−0.83). the number of decelerating af-cmes is 51% only; where as, the number of decelerating bf-cmes is 83%. the flares associated with bf-cmes have shorter rise and decay times than flares related to af-cmes. we found statistically significant differences between the two sets of associated dh-type-ii bursts characteristics: starting frequency (p∼4%), drift rate (p∼1%), and ending frequency (p∼6%). the delay time analysis of dh-type-ii start and flare onset times shows that the time lags are longer in af-cme events than in bf-cme events (p≪1%). from the above results, the af-cmes which are associated with dh-type-ii bursts are found to be more energetic, associated with long duration flares and dh-type-iis of lower ending frequencies.

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