Relationships between the AE, ap and Dst indices near solar minimum (1974) and at solar maximum (1979)

Details Relationships between the AE, ap and Dst indices near solar minimum (1974) and at solar maximum (1979) Relationships between the AE, ap and Dst indices near solar minimum (1974) and at solar maximum (1979)

Oct 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997angeo..15.1265f&link_type=abstract

Annales Geophysicae, vol. 15, Issue 10, pp.1265-1270

Physics

3

Scientific paper

Three-hourly average values of the Dst, AE and ap geomagnetic activity indices have been studied for 1 year's duration near the solar minimum (1974) and also at the solar maximum (1979). In 1979 seven intense geomagnetic storms (Dst <-100 nT) occurred, whereas in 1974 only three were reported. This study reveals: (1) the yearly average of AE is greater in 1974 than in 1979, whereas the inverse seems to be true for the yearly average of Dst, when a higher number of intense storms is present. These averages indicate the kind of activity occurring on the sun as shown in earlier work. (2) The seasonal variation of Dst is higher than that of ap and is almost negligible in AE. (3) The correlation coefficient of ap × AE is in general the highest, as the magnetometers that monitor both indices are close, and is surpassed only by the ap × Dst correlation during geomagnetic storms, when the influence of the ring current is dominant. The correlation of ap × Dst also shows a seasonal variability. (4) For the first time a study of correlation between ap and a linear combination of AE and Dst has also been made. We found higher correlation coefficients in this case as compared to those between ap × Dst and ap × AE.

Affiliated with

Also associated with

No associations

Rating

Relationships between the AE, ap and Dst indices near solar minimum (1974) and at solar maximum (1979) does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Relationships between the AE, ap and Dst indices near solar minimum (1974) and at solar maximum (1979), we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Relationships between the AE, ap and Dst indices near solar minimum (1974) and at solar maximum (1979) will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1768802