Relation between Dst* and interplanetary parameters during single-step geomagnetic storms

Autor(es)

Echer, E. ; Gonzalez, W. D.

• Tipo de documento: Artigo Científico
• Fonte: Advances in Space Research; v. 70, n. 10, p. 12-pg., 2022-10-14.

Resumo

In this work, the relation between Dst* (solar wind pressure corrected Dst) and solar wind parameters (north-south component of the interplanetary magnetic field Bz and east-west component of the electric field Ey) in the main phase of the single-step geomagnetic storms was analyzed on their peak (Dst* p and Bzp/Eyp) and difference values (Delta Dst* (p) and Delta B-z/Delta E-y). From 1995 to 2019, 133 storms with peak Dst* <= -50 nT were selected. It was found that the correlations between Dst* (p) and B-zp/E-yp (r = 0.60 and -0.69) were higher than those between Dst* (p) and DBz/DEy (r = - 0.49 and - 0.45, respectively). The correlation between the variations of DDst* and DBz/DEy were intermediate between those ranges (r = 0.52 and 0.45, respectively). Multiple linear correlation of Dst* (p) with B-zp/Delta(Bz) and E-yp/Delta(Ey) explains 38 and 48% of the variance of Dst*(p), respectively, with a larger effect of peak values of solar wind parameters. There were twice more single-step storms in cycle 23 than in cycle 24, but the average values of peaks and variations did not show significant differences. In terms of Eyp criteria for moderate (-100 nT < Dst* (p) <=-50 nT) and intense (Dst* (p) <= 100 nT) geomagnetic storms, >93% of the moderate storms had E-yp > 3 mV. m(-1), while 96% of intense storms had Eyp > 5 mV. m(-1). On DEy, 87% of the moderate storms had Delta E-y > 10 mV.m(-1), while 72% of the intense storms had DEy > 10 mV. m(-1). Thus it may be concluded that Bzp and E-yp were important for Dst* (p) of the single-step storms and that Eyp and Delta E-y values could be interplanetary criteria for the moderate and intense storms. (c) 2022 COSPAR. Published by Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 18/21657-1 - Estudo da variabilidade da atividade auroral em rádio da magnetosfera de Júpiter
• Beneficiário: Ezequiel Echer
• Modalidade de apoio: Auxílio à Pesquisa - Regular