Skip to content Skip to navigation
University of Warwick
  • Study
  • |
  • Research
  • |
  • Business
  • |
  • Alumni
  • |
  • News
  • |
  • About

University of Warwick
Publications service & WRAP

Highlight your research

  • WRAP
    • Home
    • Search WRAP
    • Browse by Warwick Author
    • Browse WRAP by Year
    • Browse WRAP by Subject
    • Browse WRAP by Department
    • Browse WRAP by Funder
    • Browse Theses by Department
  • Publications Service
    • Home
    • Search Publications Service
    • Browse by Warwick Author
    • Browse Publications service by Year
    • Browse Publications service by Subject
    • Browse Publications service by Department
    • Browse Publications service by Funder
  • Help & Advice
University of Warwick

The Library

  • Login
  • Admin

Quantifying the solar cycle modulation of extreme space weather

Tools
- Tools
+ Tools

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

[img]
Preview
PDF
WRAP-quantifying-solar-cycle-modulation-extreme-space-weather-Chapman-2020.pdf - Published Version - Requires a PDF viewer.
Available under License Creative Commons Attribution 4.0.

Download (5Mb) | Preview
Official URL: http://dx.doi.org/10.1029/2020GL087795

Request Changes to record.

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
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:
DateEvent
2020Published
30 May 2020Available
30 May 2020Accepted
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:
Project/Grant IDRIOXX Funder NameFunder ID
UNSPECIFIEDFulbright-Lloyd's of LondonUNSPECIFIED
FA9550-17-1-0054United States. Air Force. Office of Scientific Researchhttp://viaf.org/viaf/154163999
ST/P000320/1United States. Air Force. Office of Scientific Researchhttp://viaf.org/viaf/154163999

Request changes or add full text files to a record

Repository staff actions (login required)

View Item View Item

Downloads

Downloads per month over past year

View more statistics

twitter

Email us: wrap@warwick.ac.uk
Contact Details
About Us