首页|Invariability of relationships between the solar wind electric field E-KL and the magnetic activity indices PC, AL and Dst
Invariability of relationships between the solar wind electric field E-KL and the magnetic activity indices PC, AL and Dst
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NSTL
Elsevier
The daily values of the E-KL field and indices of magnetic activity PC, AL and Dst were used to verify stability of relationships between these parameters in course of 23rd and 24th solar cycles. The results of analysis demonstrate that the mean level of correlation between the E-KL field and PC index remains in range R = 0.85-0.90 over 24 years. During the solar maximum epochs (2008, 2015) the correlation between E-KL and PC reduced down to R = 0.75, the decrease being related to solar protons events (SPE), which strongly affect the ionospheric conductivity in polar caps. In the course of both cycles the daily AL index well correlated with PC index (R = 0.93) and with E-KL field (R = 0.83); correlation of daily Dst index with PC and EKL values was much worse (R = 0.72 and 0.64, correspondingly), the correlation being independent of solar activity epochs and cycles. The PC indices in northern (PCN) and southern (PCS) indices hemispheres demonstrate the evident seasonal variation; the PCsummer index is commonly larger than the PCwinter index, but PCwinter index better correlates with E-KL field. The conclusion is made that relationships between the E-KL field, PC index, and the magnetic disturbance indices AL and Dst remained valid in course of 23rd and 24th solar cycles and, therefore, the calibrating coefficients, determining these relationships, are not affected by solar activity.
The solar wind electric field EklThe polar cap magnetic activity index PCMagnetospheric substorms and magnetic storms23rd and 24th cycles of solar activityALIGNED CURRENTSPOLAR-CAPDISTRIBUTIONSQUANTITIESENERGY
Dolgacheva, S. A.、Sormakov, D. A.、Troshichev, O. A.
NSTL
Elsevier
