TY JOUR TI Regression Derivatives and Their Application in the Study of Magnetic Storms KW Proximity measure KW regression derivation KW regression smoothing KW measures of activity. multi-scale measures of activitys JO Russian Journal of Earth Sciences AU Agayan, S.M. AU Bogoutdinov, S.R. AU Sidorov, R.V. AU Soloviev, A.A. AU Kamaev, D.A. AU Aleksanyan, A.O. AU Dzeranov, B.V. PY 2023 IS 23 PB Geophysical Center of the Russian Academy of Sciences