Abstract
Interplanetary shocks are important precursors of interplanetary coronal mass ejections (ICMEs) and corotating interaction regions (CIRs). The shock compression and draping effects on the interplanetary magnetic field (IMF) in sheaths can lead to significant geomagnetic activity. We identified 297 fast forward shocks observed by the Advanced Composition Explorer spacecraft upstream of the Earth, and analyzed their geomagnetic impacts in solar cycle (SC) 23 (1998–2008) and SC24 (2009–2018). The shock (normalized) occurrence rate is found to be significantly higher during SC23 compared to SC24, and it exhibits a stronger correlation with the sunspot number during SC23 (correlation coefficient \(r = 0.93\)) than during SC24 (\(r = 0.86\)). The average shock compressions of the IMF magnitude and plasma density are \(\approx 2.0\) and \(\approx 2.4\), respectively, with no significant correlation with geomagnetic activity. Variations of solar wind parameters and geomagnetic activity indices following the shock arrival are explored. An interval of 6 h (3 days) following the shock is characterized by the average peak values of solar wind speed \(V_{\textrm{sw}} = 525~(610)\) km s\(^{-1}\), IMF \(B_{\textrm{z}} = -6.5~(-11.1)\) nT, and electric field \(E_{\textrm{y}} = 3.5~(6.1)\) mV m\(^{-1}\), followed by the average peak geomagnetic indices of \(\textrm{Dst}=-36~(-83)\) nT, \(\textrm{ap}=56~(92)\) nT, and \(\textrm{AE}=733~(1061)\) nT. About 25% and 63% of the shocks are followed by geomagnetic storms with \(\textrm{Dst}\le -50\) nT in the following 6-h and 3-day periods, respectively. The percentages of shocks followed by the auroral activity level \(\textrm{AE}>500\) nT are \(\approx 65\)% and \(\approx 96\)% for the short and long intervals, respectively. For the ap activity level (\(>56\) nT), the geoeffective shocks are \(\approx 30\)% and \(\approx 60\)%, respectively. The overall increase in the geomagnetic activity after the shock arrival for the longer shock-preceded interval is possibly due to inclusion of contributions from shock driver (ICME or CIR) fields. It can be concluded that an interplanetary fast forward shock has a probability of 1/4 to be followed by geomagnetic storms, and of 2/3 to be followed by significant auroral activity. We derived probability distribution functions of geomagnetic indices for the 6-h and 3-day intervals following shocks. The results might be important for space weather modeling and applications.
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Data Availability
The solar wind plasma and IMF data used in this work are obtained from the ACE Science Center (http://www.srl.caltech.edu/ACE/ASC/level2/). The geomagnetic indices are collected from the OMNIweb database (https://omniweb.gsfc.nasa.gov/). The SSN data are obtained from the Royal Observatory of Belgium (https://wwwbis.sidc.be/silso/home).
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Acknowledgements
E. E. would like to thank Brazilian agencies for research grants: CNPq (contract no. PQ-302583/2015-7, PQ-301883/2019-0) and FAPESP (2018/21657-1). A. L. and L. E. S. N. would like to thank the PIBIFSP Program for the fellowship received during 2019 and 2020 as well as CAPES – Brazilian Federal Agency - and CAP/INPE Pos Graduation Program for the Master's fellowship. The work of R. H. is funded by the Science and Engineering Research Board (SERB, grant no. SB/S2/RJN-080/2018), a statutory body of the Department of Science and Technology (DST), Government of India through the Ramanujan fellowship. The work of A. M. S. F. is funded by the Brazilian CNPq agency (project no. PQ-300969/2020-1, PQ-301542/2021-0). The work of M. J. A. B. was supported by CNPq agency (contract no. PQ-302330/2015-1, PQ-305692/2018-6) and FAPEG agency (contract no. 2012.1026.7000905). We thank the Brazilian Ministry of Science, Technology and Innovation and the Brazilian Space Agency as well. The solar wind plasma and IMF data used in this work are obtained from the ACE Science Center (http://www.srl.caltech.edu/ACE/ASC/level2/). The geomagnetic indices are collected from the OMNIweb database (https://omniweb.gsfc.nasa.gov/). The SSN data are obtained from the Royal Observatory of Belgium (https://wwwbis.sidc.be/silso/home).
Funding
A. M. S. F was funded by FAPESP (projects 2016/10794-2 and 2017/00516-8) and CNPq agency (projects PQ-300969/2020-1, PQ-301542/2021-0). E. E. received grants from FAPESP (2018/21657-1) and CNPq (PQ-301883/2019-0) agencies. M. J. A. B. was supported by CNPq agency contract number (PQ-305692/2018-6) and FAPEG agency contract number 2012. 1026.7000905. R. H. received support from the Science and Engineering Research Board grant SB/S2/RJN-080/2018.
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Echer, E., Lucas, A.d., Hajra, R. et al. Geomagnetic Activity Following Interplanetary Shocks in Solar Cycles 23 and 24. Braz J Phys 53, 79 (2023). https://doi.org/10.1007/s13538-023-01294-w
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DOI: https://doi.org/10.1007/s13538-023-01294-w