Secular change in geomagnetic indices and the solar open magnetic flux during the first half of the twentieth century

Details Secular change in geomagnetic indices and the solar open magnetic flux during the first half of the twentieth century Secular change in geomagnetic indices and the solar open magnetic flux during the first half of the twentieth century

Oct 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002jgra..107.1303c&link_type=abstract

Journal of Geophysical Research (Space Physics), Volume 107, Issue A10, pp. SSH 11-1, CiteID 1303, DOI 10.1029/2001JA000505

Astronomy and Astrophysics

Astrophysics

3

Geomagnetism And Paleomagnetism: Time Variations-Secular And Long Term, Global Change: Solar Variability, Magnetospheric Physics: Solar Wind/Magnetosphere Interactions, Solar Physics, Astrophysics, And Astronomy: Solar And Stellar Variability

Scientific paper

We examined several long-term geomagnetic indices (u, Ci, and Hm) to substantiate the secular increase in the aa index during the first half of the twentieth century. The long-term increase in aa and other geomagnetic indices was accompanied by a corresponding rise in the envelope of the sunspot number (~130% increase of cycle averages). We used a correlation between solar cycle averages of sunspot number and solar open magnetic flux for recent cycles to infer a 140 +/- 80% increase in the open flux between ~1900 and ~1950, comparable to the ~130% increase in this parameter during the twentieth century deduced by Lockwood et al. [1999] from solar wind measurements during the space age. While the uncertainty in our result is large, our method, which is not based on aa, provides independent support for a substantial increase in the open magnetic flux during the last century.

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