Relation between Dst* and interplanetary parameters during single-step geomagnetic storms. Issue 10 (15th November 2022)

• Record Type: Journal Article
• Authors: Echer, E.; Gonzalez, W.D.
• Is Part Of: Advances in space research. Volume 70:Issue 10(2022)
• Page Start: 2830
• Page End: 2841
• Publication Date: 2022-11-15
• Subjects: Geomagnetic storms -- Magnetosphere -- Solar wind -- Space weather -- Solar activity; Space sciences -- Periodicals; Astronautics -- Periodicals; Geophysics -- Periodicals; 500.505
• DOI: 10.1016/j.asr.2022.07.031
• Languages: English
• ISSNs: 0273-1177

Abstract

Abstract: 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 ( ΔDst*p and ΔBz /ΔEy ). From 1995 to 2019, 133 storms with peak Dst * ≤ −50 nT were selected. It was found that the correlations between Dst*p and Bzp / Eyp (r = 0.60 and −0.69) were higher than those between Dst*p and ΔBz /ΔEy (r = −0.49 and −0.45, respectively). The correlation between the variations of ΔDst* and ΔBz / ΔEy were intermediate between those ranges (r = 0.52 and 0.45, respectively). Multiple linear correlation of Dst*p with Bzp /ΔBz and Eyp / ΔEy 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 Eyp > 3 mV·m −1, while 96% of intense storms had Eyp > 5 mV·m −1 . On ΔEy, 87% of the moderate storms had ΔEy ≤ 10 mV·m −1, while 72% of the intense storms had ΔEy > 10 mV·m −1 . Thus it may be concluded that Bzp and Eyp were important for Dst*p of the single-step storms and that Eyp and Δ Ey values could be interplanetary criteria for the moderate and intense storms.