Physics
Scientific paper
May 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmsh51a..06s&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SH51A-06
Physics
7524 Magnetic Fields, 7537 Solar And Stellar Variability (1650), 1739 Solar/Planetary Relationships, 2134 Interplanetary Magnetic Fields, 2776 Polar Cap Phenomena
Scientific paper
Using geomagnetic measurements made by Robert F. Scott at Discovery Hut in the Antarctic polar cap 1902- 1903 and by Roald Amundsen at Gjøahavn in the Arctic polar cap 1903-1906 we determine the strength of the cross polar cap equivalent current. This quantity is controlled by the interplanetary electric field, E, (essentially the product VB of solar wind speed V and IMF strength B). Comparison with modern data from contemporary polar cap stations at similar latitudes and locations and from spacecraft yields the conversion factor from the variation measured on the ground to the electric field E. Our geomagnetic activity indices IDV and IHV measure B and BV22, respectively, thus allowing both B and V to be determined since at least 1882. Their product VB agrees well with VB determined from the early polar cap data, providing an important independent confirmation of the validity of all three methods. We find that B during 1902-1906 was ~6 nT, comparable to present day values ~100 years later.
Cliver Edward W.
Svalgaard Leif
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