Other
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmgp53a..07s&link_type=abstract
American Geophysical Union, Spring Meeting 2008, abstract #GP53A-07
Other
1555 Time Variations: Diurnal To Decadal, 1560 Time Variations: Secular And Longer, 2162 Solar Cycle Variations (7536), 7537 Solar And Stellar Variability (1650), 7974 Solar Effects
Scientific paper
We review the recently introduced geomagnetic activity indices: IDV (InterDiurnal Variability) and IHV (InterHourly Variability). Their salient features are the use of night-time data only to cleanly avoid the effect of the daily 'quiet- time' variation and the use of only hourly values of the magnetic elements. Since the two indices have different dependencies on interplanetary magnetic field strength (B) and solar wind speed (V), they can be used to deduce B and V separately affording us a way of estimating solar wind properties in the past ~180 years. In addition, they provide a valuable check on the calibration of other long-term indices, e.g. the aa-index, which has been found in need of a recalibration. We discuss the physical meaning of the indices, e.g. show that IHV is directly proportional to the power input to the ionosphere [POES Hp-index]. We discuss the construction and stability with time of the indices and the several pitfalls to avoid.
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