Solar Wind and Global Electron Hemispheric Power in Solar Minimum Intervals

Details Solar Wind and Global Electron Hemispheric Power in Solar Minimum Intervals Solar Wind and Global Electron Hemispheric Power in Solar Minimum Intervals

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsa33b1640e&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SA33B-1640

Physics

0310 Airglow And Aurora, 0358 Thermosphere: Energy Deposition (3369), 2162 Solar Cycle Variations (7536), 2455 Particle Precipitation

Scientific paper

We assess the periodicities of the hourly and daily solar wind velocity (Vsw) and average global electron auroral hemispheric power (Hpeg) with Lomb-Scargle (L-S) and Fast Fourier Transforms (FFTs) using three Carrington Rotations (CRs) to a year or more of data in two different solar minimum periods. The first Whole Sun Month (WSM) interval (96223-96252) was during the last solar minimum where the solar magnetic field relaxed into a dipole. A strong 'semiannual' periodicity in Vsw maximizing in equinoxes was found, which enhanced the equinoctial maxima found in Hpeg (and Kp) due to the preferred solar wind and magnetospheric reconnection during equinoxes. In the present solar minimum, the solar magnetic field has considerable quadrupole components during the Whole Heliospheric Interval (WHI, 08080-08107). Hpeg exhibits solar rotational periodicities similar to those for Vsw using both L-S and FFT analyses, where the 9- day periodicity is particularly strong in the present solar minimum period. The 9-day periodicity in the WHI CR was caused by three periods of slow-speed solar wind from near the ecliptic plane as seen in the sign of IMF Bx. Periodicities are examined in Vsw since 1972, and in Hpeg since 1978 to assess solar cycle variations. Periodicities longer than 100 days are not as strong or as well correlated between Vsw and Hpeg compared to the shorter solar rotational periodicities.

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