On derivation and significance of geomagnetic equivalent amplitude indices
Abstract
Linear geomagnetic activity indices designated as equivalent amplitudes are compared. Bartel's daily Ap and Mayand's corresponding Am and An are considered. It is demonstrated that a good correlation exists between Ap and Am. However, for the Ap data, a noticeable divergence appears in the years after 1965. A statistical variance analysis of the semiannual wave shows that the scattering for Ap is considerably smaller than for An and thus is the probable error of the average wave. It is concluded that Ap should be preferred.
- Publication:
-
Scientific Contributions in Commemoration of Ebro Observatory's 75th Anniversary
- Pub Date:
- 1983
- Bibcode:
- 1983ebro.conf..155S
- Keywords:
-
- Amplitudes;
- Geomagnetism;
- Indexes (Ratios);
- Magnetic Variations;
- Periodic Variations;
- Correlation;
- Magnetic Flux;
- Secular Variations;
- Variance (Statistics);
- Geophysics