Solar cycle effects in near-Earth interplanetary parameters and geomagnetic activity

Details Solar cycle effects in near-Earth interplanetary parameters and geomagnetic activity Solar cycle effects in near-Earth interplanetary parameters and geomagnetic activity

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sh52a06p&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SH52A-06

Physics

2162 Solar Cycle Variations (7536), 2784 Solar Wind/Magnetosphere Interactions, 2788 Storms And Substorms, 7536 Solar Activity Cycle (2162)

Scientific paper

Solar cycle effects are investigated in planetary geomagnetic activity from 27-day averages of several near-Earth OMNI parameters compared with equivalent Kp and Dst index averages for almost four decades (1964-2001). Some established trends in these parameters over solar cycles are confirmed; for example, it is concluded that changes in the magnitude (rather than in direction) constitute the primary solar cycle variation in the IMF. The solar cycle effects are also thoroughly studied from the northern polar cap magnetic activity index PCN (1975-2001), which is considered as an ``ionospheric gauge'' of the ``merging'' interplanetary electric field constantly applied to the geomagnetosphere; these results are compared with available studies of solar cycle effects in the auroral magnetic activity indices AL and AU. It is concluded that the 11-year solar activity cycle is clearly seen in all above-mentioned parameters and indices; however, the available time series are not long enough to confirm firmly the existing hypothesis of the increasing geomagnetic activity during last century. Our study also reveals that long-term changes in planetary geomagnetic activity are driven more actively by solar wind-magnetosphere coupling of an electrodynamic nature rather than by plasma transport into the magnetosphere. This suggests that ambient interplanetary ``electric'' environment (in which the Earth's magnetosphere is immersed over the solar cycles) may play a more significant role in causing changes in the frequency of geomagnetic storms and substorms than previously realized.

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