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Interplanetary (IP) shock plays a key role in causing the global dynamicchanges of the geospace environment. For the perspective of Solar-Terrestrialrelationship, it will be of great importance to estimate the properties ofpost-shock solar wind simply and accurately. Motivated by this, we performed astatistical analysis of IP shocks during 1998-2008, focusing on thesignificantly different responses of two well-used geomagnetic indices (SYMHand AL) to the passive of two types of IP shocks. For the IP shocks withnorthward IMF (91 cases), the SYMH index keeps on the high level after thesudden impulses (SI) for a long time. Meanwhile, the change of AL index isrelative small, with an mean value of only -29 nT. However, for the IP shockswith southward IMF (92 cases), the SYMH index suddenly decreases at a certainrate after SI, and the change of AL index is much significant, of -316 nT.Furthermore, the change rate of SYMH index after SI is found to be linearlycorrelated with the post-shock reconnection E-field (E$_{KL}$). Based on thesefacts, an inversion model of post-shock IMF orientation and E$_{KL}$ isdeveloped. The model validity is also confirmed by studying 68 IP shocks in theperiod of 2009-2013. The inversion accuracy of IMF orientation is 88.24%, andthe inversion efficiency of E$_{KL}$ is as high as 78%.

Properties of post-shock solar wind deduced from geomagnetic indices responses after sudden impulses