Long-Term Variations in Geomagnetic Indices

Details Long-Term Variations in Geomagnetic Indices Long-Term Variations in Geomagnetic Indices

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sh51a01c&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SH51A-01 INVITED

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2784 Solar Wind/Magnetosphere Interactions

Scientific paper

The geomagnetic aa index developed by Mayaud and available from 1868-present exhibited a remarkable increase during the 20th century, such that recent 11-yr minima in this index are higher than maxima from 100 years ago. Is this long-term increase in aa due to a corresponding change in solar/solar wind conditions or to something else? To address this question, I review the derivation of the aa index and compare its behavior with that of magnetic indices (Ap, am, Dst, and AE) available for shorter periods of time as well as with the sunspot number. I also review work on other potential contributors to the long-term increase in aa such as the secular change of Earth's main field.

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