Dipole Tilt Effects on the Dst index

Details Dipole Tilt Effects on the Dst index Dipole Tilt Effects on the Dst index

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm22b..03t&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SM22B-03

Physics

2722 Forecasting, 2730 Magnetosphere: Inner, 2778 Ring Current, 2784 Solar Wind/Magnetosphere Interactions, 2788 Storms And Substorms

Scientific paper

The Dst index shows a large variation with season with larger negative values occurring at the equinoxes. As is well known, larger magnetic storms occur more often near the equinoxes but the average baseline value of Dst also shows the same seasonal periodicity. We have been able to model Dst using the solar wind as an input. The modeled Dst index is sum of several driver terms with different decay constants and a pressure term. All terms have a significant equinoctial variation. The equinoctial terms were introduced into the model with arbitrary phases and best phase was found through minimizing the least square error. The phase agrees with and thus confirms the equinoctial effect. Much of the baseline seasonal variation in Dst is the result of the varying effect of the pressure term. The diurnal variation in Dst is substantially smaller than one would expect given the seasonal variation. This may be due to the removal of the diurnal variation from the Dst index. Some of the diurnal variation, which is mostly due to the Sq ionospheric current, is in fact due to magnetospheric currents and may also be removed in forming the Dst index. The removal of the Sq current system in not perfect and there is on average 9 nT peak-to-peak residual diurnal signal of varying phase remaining in the Dst index. The modeled Dst confirms the dominance of the equinoctial effect on the seasonal dependence of Dst index and thus on magnetospheric activity despite many minor inconsistencies in the behavior of the individual terms that make up the modeled Dst.

Affiliated with

Also associated with

No associations

Rating

Dipole Tilt Effects on the Dst index 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 Dipole Tilt Effects on the Dst index, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dipole Tilt Effects on the Dst index will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1438651