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اخترفیزیک و علوم فضایی 2013
جزئیات رویداد
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  • geoeffectiveness and flare properties of radio-loud cmes

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    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 914
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     a detailed investigation on geoeffective cmes associated with meter to deca-hectometer (herein after m- and dh-type-ii) wavelengths range type-ii radio bursts observed during the period 1997–2005 is presented. the study consists of three steps: i) the characteristics of m-and dh-type-ii bursts associated with flares and geoeffective cmes; ii) characteristics of geo and non-geoeffective radio-loud and quiet cmes, iii) the relationships between the geoeffective cmes and flares properties. interestingly, we found that 92 % of dh-type-ii bursts are extension of m-type-ii burst which are associated with faster and wider geoeffective dh-cmes and also associated with longer/stronger flares. the geoeffective cme-associated m-type-ii bursts have higher starting frequency, lower ending frequency and larger bandwidth compared to the general population of m-type-ii bursts. the geoeffective cme-associated dh-type-ii bursts have longer duration (p≪1 %), lower ending frequency (p=2 %) and lower drift rates (p=2 %) than that of dh-type-iis associated with non-geoeffective cmes. the differences in mean speed of geoeffective dh-cmes and non-geoeffective dh-cmes (1327 km s−1 and 1191 km s−1, respectively) is statistically insignificant (p=20 %).however, the mean difference in width (339∘ and 251∘, respectively) is high statistical significant (p=0.8 %). the geo-effective general populations of lasco cmes speeds (545 km s−1 and 450 km s−1, respectively) and widths (252∘ and 60∘, respectively) is higher than the non geo-effective general populations of lasco cmes (p=3 % and p=0.02 %, respectively). the geoeffective cmes associated flares have longer duration, and strong flares than non-geoeffective dh-cmes associated flares (p=0.8 % and p=1 %, respectively). we have found a good correlation between the geo-effective flare and dh-cmes properties: i) cmes speed—acceleration (r=−0.78, where r is a linear correlation coefficient), ii) acceleration—flare peak flux (r=−0.73) and, iii) acceleration—dst index intensity (r=0.75). the radio-rich cmes (dh-cmes) produced more energetic storm than the radio-quiet cmes (general populations of lasco cmes). the above results indicate that the dh-type-ii bursts tend to be related with flares and geoeffective cmes, although there is no physical explanation for the result. if the dh-type-ii burst is a continuation of m-type-ii burst, it could be a good indicator of geoeffective storms, which has important implications for space weather studies.

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