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Hertz Range Pulsations during Recovery Phase of the Magnetic Storm on September 7–8, 2017, and Relation between their Dynamics and Changes in the Parameters of the Interplanetary Medium

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Abstract

The shape and dynamics of an unusual disturbance in the Pc1 geomagnetic pulsation range recorded by ground-based induction magnetometers during the morning hours (03–06 MLT) on September 11, 2017, in the late recovery phase of a strong magnetic storm were analyzed in the context of changes in the parameters of the interplanetary medium. Pulsations were observed in the auroral and subauroral zones, as well as at midlatitudes, and had a complex structure in the form of multiplet “pearls” (1–1.5 Hz range) and two series of narrow-band bursts (2–3 Hz range) with a repetition period of ~5 and ~20 min. Pulsations in the form of a series of bursts are a rare event and are recorded mainly during the daytime hours. Comparison of the dynamics of Pc1 pulsations with the parameters of the interplanetary medium was carried out with data from the DSCOVR and THEMIS satellites. A change in the carrier frequency and intensity of multiplet pearls was a response to a jump in the plasma density of the solar wind. A series of bursts with a period of ~5 min could be initiated by a simultaneous increase in the solar-wind velocity and the By-component of the interplanetary magnetic field, which was observed ~40 min after the density jump. We associate bursts with a period of ~20 min either with the response of the magnetosphere to the short-term excursion of the daytime magnetopause to the Earth or with oscillations of a close period in the transition region ahead of the front of the density perturbation. The frequency, period, and amplitude of the pulsations are estimated.

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ACKNOWLEDGMENTS

The data from the THEMIS and DSCOVR satellites are taken from the CDAWeb database; the providers are V. Angelopoulos and A. Szabo, respectively (both from NASA). The magnetograms of the low-latitude observatories ABG and HON were obtained from the INTERMAGNET site. The L parameter for the TUL, SPG and UZR observatories was determined online on the VITMO virtual observatory site (https://cohoweb.gsfc.nasa.gov/vitmo/cgm_vitmo.html). An online procedure for the calculation of equivalent ionospheric currents is available on the MIRACLE project website. The authors thank I.R. Manna, D.K. Milling, and the CARISMA project staff for magnetic data.

The CARISMA network is managed by the University of Alberta and is funded by the Canadian Space Agency. The data from the SB RAS induction magnetometer at Uzur Observatory was provided by R.A. Rakhmatulin. The authors thank E.D. Tereshchenko, V.F. Grigorieva, R.Yu. Yurika (all are PGI workers), and A.L. Kotikova (SPbF IZMIRAN) for his help with the work.

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Correspondence to V. V. Safargaleev.

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Translated by E. Seifina

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Safargaleev, V.V., Tereshchenko, P.E. Hertz Range Pulsations during Recovery Phase of the Magnetic Storm on September 7–8, 2017, and Relation between their Dynamics and Changes in the Parameters of the Interplanetary Medium. Geomagn. Aeron. 59, 281–295 (2019). https://doi.org/10.1134/S0016793219030125

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  • DOI: https://doi.org/10.1134/S0016793219030125

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