Centennial changes in the solar wind speed and in the open solar flux

Details Centennial changes in the solar wind speed and in the open solar flux Centennial changes in the solar wind speed and in the open solar flux

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007jgra..11205103r&link_type=abstract

Journal of Geophysical Research, Volume 112, Issue A5, CiteID A05103

Astronomy and Astrophysics

Astrophysics

30

Global Change: Solar Variability (7537), Interplanetary Physics: Interplanetary Magnetic Fields, Interplanetary Physics: Solar Wind Plasma, Magnetospheric Physics: Solar Wind/Magnetosphere Interactions, Solar Physics, Astrophysics, And Astronomy: Solar And Stellar Variability (1650)

Scientific paper

We use combinations of geomagnetic indices, based on both variation range and hourly means, to derive the solar wind flow speed, the interplanetary magnetic field strength at 1 AU and the total open solar flux between 1895 and the present. We analyze the effects of the regression procedure and geomagnetic indices used by adopting four analysis methods. These give a mean interplanetary magnetic field strength increase of 45.1 +/- 4.5% between 1903 and 1956, associated with a 14.4 +/- 0.7% rise in the solar wind speed. We use averaging timescales of 1 and 2 days to allow for the difference between the magnetic fluxes threading the coronal source surface and the heliocentric sphere at 1 AU. The largest uncertainties originate from the choice of regression procedure: the average of all eight estimates of the rise in open solar flux is 73.0 +/- 5.0%, but the best procedure, giving the narrowest and most symmetric distribution of fit residuals, yields 87.3 +/- 3.9%.

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