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Development of substorm bulges during storms of different interplanetary origins

Development of substorm bulges during storms of different interplanetary origins I.V. Despirak 1 , A.A. Lubchich 1 , V. Guineva 2 1. Polar Geophysical Institute, Apatity, Russia 2. Solar-Terrestrial Influences Laboratory, Stara Zagora, Bulgaria. Introduction.

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Development of substorm bulges during storms of different interplanetary origins

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  1. Development of substorm bulges during storms of different interplanetary origins I.V. Despirak1, A.A. Lubchich1, V. Guineva2 1. Polar Geophysical Institute, Apatity, Russia 2. Solar-Terrestrial Influences Laboratory, Stara Zagora, Bulgaria

  2. Introduction The stormsare mainly generated by different typesof solar wind: ICME including Sheath and body of ICME (MC) and CIR (Vieira et al. (2004); Huttunen and Koskinen (2004); Yermolaevet al.,(2005); Yermolaev and Yermolaev (2006)) There are differences between storms generated by Sheath, MC and CIR (in intensity, recovery phase duration, etc.) (Borovskyand Denton, 2006; Denton et al., 2006; Pulkkinen et al, 2007).

  3. Lo- onsetlatitude Lm-maximum latitude Llat, Llong-latitudinal and longitudinal size of the bulge Motivation of study To investigate the distinctions in the development of substorms occurring during geomagnetic storms connected with theMC, SheathandCIR. We use the optical data of substorm development from the Polar satellite which are compared with interplanetary medium parameters measured by the Wind satellite. The auroral substorm development is studied here on the basis of the Polar UVI data in LBHL band (1600-1800 Å).

  4. Examples of the Sheath, MC and CIR observations from WIND spacecraft data

  5. CIR-generated magnetic storm: substorm occurred under high values of solar wind parameters (VX ~ - 705 km/s , BZ ~ - 12.5 nT) and during the storm main phase (Dst ~ - 67). Onset latitude55.3º; Maximal latitude82.3 º; The ratio between longitudinal and latitudinal sizes (Ld/LF)8.8 during CIR of 28 February 1997

  6. Sheath or MC – generated magnetic storm: substorm development under extremely high values of solar wind parameters (VX ~ - 1022 km/s, BZ ~ - 35 nT) and the auroral bulge dynamics during magnetic storm main phase (Dst ~ - 198). Onset latitude50.5º; Maximal latitude68.7º; The ratio between longitudinal and latitudinal sizes (Ld/LF)17.7 during MC of 15 July 2000

  7. Event 21-22.10.2001: (Pulkkinen et al., 2006) 1) 2) 3) 1) 2) 3)

  8. Event 21-22.10.2001: (Pulkkinen et al., 2006) 1) 2) 3)

  9. Ratio of longitudinal to latitudinal dimension of the auroral bulge: MC: CIR: Median and quartile values of the latitudinal and longitudinal sizes for the substorms during MCs andRS’s for CIR- and Sheath- associated substorms

  10. Conclusion The auroral bulge “geometry” differs for substorms occurring during storms generated by different interplanetary origins. Especially during MC- storms the auroral bulge is confined in latitude and extended in longitude. We relate this to MC-like configuration of the near-Earth magnetotail, which is very stretched in wide range of MLT.

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