Physics of auroral phenomena : proceedings of the 39th annual seminar, Apatity, 29 February-4 March, 2016 / [ed. board: N. V. Semenova, A. G. Yahnin]. - Апатиты : Издательство Кольского научного центра РАН, 2016. - 167 с. : ил., табл.

".P hysics o f Auroral P h e n om en a P ro c. XXXIX Annual Sem inar. A p atity, pp. 23-26. 2 0 1 6 © Polar Geophysical Institute. 2016 Polar Geophysical Institute MANIFESTATION OF INTERPLANETARY SHOCK IN GEOMAGNETIC STORMS AND SUBSTORMS L.P. S h ad rin a1, S.A. Starodubtsev2 'A cadem y o f Sciences o f Republic o f Sakha (Yakutia), Yakutsk 2Y u .G. Sha fer Institute o f Cosmophysical Research and A e ronom y o f SB RAS, Yakutsk e-mails: lushadr@mail.ru, starodub@ ikfia.sbras.ru Abstract. The influence of interplanetary shocks accompanied or not with coronal mass ejections (CME) on geomagnetic storms and substorms generation was investigated. For this aim we have analyzed the data of solar wind parameters and geomagnetic activity (Dst and AE indexes). It was shown that the CME presence after the shock plays a crucial role for the generation of Dst decreasing, i.e. for the geomagnetic storm. While for the substorm disturbances (enhances of AE index) it is important the internal state of the magnetosphere after the shock impact. 1. Introduction Passage of interplanetary shocks (ISh) is one of the main reasons for the geomagnetic storm generation. This have been noted in a number of papers [Badruddin, 1998; Cho et al., 2003; Manoharan et al., 2004; Wu and Lepping, 2008]. Owing to [Echer and Gonzalez, 2004; Xu et al., 2009] by response in moderate and intense storms (Dst < -50 hT) geoeffectiveness only about 50% of the ISh. Magnetic clouds have an important role in the magnetic storm generation, and 81% geoeffective ISh associated with interplanetary mass ejections (ICME). In paper [Yermolaev and Yermolaev, 2003] there was analyzed 464 geomagnetic storms and it was shown, that the most geoeffective solar wind structures are magnetic clouds (MC) (~61%), three times less geoeffective (~ 20-21%) are events of corotating interplanetary regions (CIR) and Ejecta with Sheath and the least geoeffective (~ 8%) are events of Ejecta without Sheath. Response to the passage of ISh in substorm disturbances was considered in papers [Zhou and Tsurutani, 2001; Hong et al., 2001; Meurant et al., 2005; Nikolaeva et al., 2011]. It was noted that ISh and associated solar wind dynamic pressure increases and ICME lead to compression of the magnetosphere and can trigger a substorm. Thus, it is important the presence of negative IMF Bz [Solovyev et al., 2006]. The purpose of this work is to evaluate the effectiveness of ISh by Dst index decreases (geomagnetic storms) and substorm disturbances (AE index increases) depending on the ICME presence. 2. Data analysis Data on ISh were obtained from the Internet, the data ACE list (http://www.ssg.sr.unh.edu/mag/ace/ ACElists/obsJist.htm l), data on CME from the catalog of the paper [Richardson and Cane, 2010] ( http://www.srl.caltech.edu/ACE/ASC/DATA/level3/icmetable2.htm ) , sudden storm commencements SSC - from bulletin IAGA Bull, (ftp://ftp.ngdc.noaa.gov/STP/SOLAR_DATA/SUDDEN_COMMENCEMENTSI ) , geomagnetic indices Dst and AE from http://wdc.kugi.kyoto-u.ac.jp/. The analysis of these data on the growth phase of the 23rd solar cycle was fulfilled. The minimum of the cycle was observed in 1996 (average annual number of sunspots W=8,6), maximum was in 2000 (W=l 19,6). In the analyzed time period from September 1997 to December 1999 according to the using catalogs has been registered 80 ISh, 27 ICME, 60 geomagnetic storms, 26 of them were sporadic and 34 recurrent. Time of the geomagnetic storm beginning was determined by main phase of the storm - a sharp decrease of Dst-index on more than 30 nT (weak storms), more then 60 nT (moderate storms) and more then 100 nT (intense storms). As a beginning of the substorm was taken an hour, when the AE index increased more than 200 nT duration more 10 hours. For the analyze we selected isolated events with the absence of repeated disturbances for 1 day. As a result, there were formed three groups of the events: 1. There was ICME behind the ISh and geomagnetic storm was observed on the Earth - (Shock + CME + Dst) = 17 events, including 9 intense, 5 - moderate, 3 - weak storms 2. There was no ICME behind the ISh and geomagnetic storm was observed on the Earth - (Shock - CME + Dst) = 27 events, including 7 intense, 5 - moderate, 15 - weak storms. 3. There was no ICME behind the ISh and no geomagnetic storm on the Earth - (Shock - CME - Dst) = 20 events. 3. Discussions In all groups the passage of ISh was accompanied by intensification of substorm activity (AE index increasing) and in the most cases there were SSCs. The absence of SSC were in 3 cases from 17 for the 1st group, in 7 cases from 27 for the 2nd group, in 8 cases from 20 for the 3rd group. 23