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Quantifying the solar cycle modulation of extreme space weather
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Chapman, Sandra C., McIntosh, S. W., Leamon, R. J. and Watkins, Nicholas W. (2020) Quantifying the solar cycle modulation of extreme space weather. Geophysical Research Letters, 47 (11). doi:10.1029/2020GL087795
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Official URL: http://dx.doi.org/10.1029/2020GL087795
Abstract
By obtaining the analytic signal of daily sunspot numbers since 1818 we construct a new solar cycle phase clock that maps each of the last 18 solar cycles onto a single normalized 11 year epoch. This clock orders solar coronal activity and extremes of the aa index, which tracks geomagnetic storms at the Earth's surface over the last 14 solar cycles. We identify geomagnetically quiet intervals that are 40% of the normalized cycle, ±2π /5 in phase or ±2.2 years around solar minimum. Since 1868 only two severe (aa >300 nT) and one extreme (aa >500 nT) geomagnetic storms occurred in quiet intervals; 1–3% of severe (aa >300 nT) geomagnetic storms and 4–6% of C‐, M‐, and X‐class solar flares occurred in quiet intervals. This provides quantitative support to planning resilience against space weather impacts since only a few percent of all severe storms occur in quiet intervals and their start and end times are quantifiable.
| Item Type: | Journal Article | ||||||||||||
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| Subjects: | Q Science > QB Astronomy | ||||||||||||
| Divisions: | Faculty of Science > Physics | ||||||||||||
| Library of Congress Subject Headings (LCSH): | Space environment, Sun -- Environmental aspects, Solar system, Solar activity -- Forecasting, Magnetic storms | ||||||||||||
| Journal or Publication Title: | Geophysical Research Letters | ||||||||||||
| Publisher: | American Geophysical Union | ||||||||||||
| ISSN: | 0094-8276 | ||||||||||||
| Official Date: | 2020 | ||||||||||||
| Dates: |
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| Date of first compliant deposit: | 9 June 2020 | ||||||||||||
| Volume: | 47 | ||||||||||||
| Number: | 11 | ||||||||||||
| DOI: | 10.1029/2020GL087795 | ||||||||||||
| Status: | Peer Reviewed | ||||||||||||
| Publication Status: | Published | ||||||||||||
| Access rights to Published version: | Open Access | ||||||||||||
| RIOXX Funder/Project Grant: |
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