Coronal holes, solar wind streams, and geomagnetic activity during the new sunspot cycle

Details Coronal holes, solar wind streams, and geomagnetic activity during the new sunspot cycle Coronal holes, solar wind streams, and geomagnetic activity during the new sunspot cycle

Sep 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978soph...59..159s&link_type=abstract

Solar Physics, vol. 59, Sept. 1978, p. 159-173. NOAA-supported research;

Physics

15

Coronal Holes, Geomagnetic Pulsations, Solar Terrestrial Interactions, Solar Wind Velocity, Stellar Spectrophotometry, Sunspot Cycle, Helium, Infrared Imagery, Solar Atmosphere, Solar Magnetic Field, Spectrograms

Scientific paper

The paper presents results obtained for 1976-1977 using daily He I 10830 A spectroheliograms and photospheric magnetograms. It was found that as the magnetic field patterns changed, the solar atmosphere evolved from a structure with a few large long-lived low-latitude coronal holes to one with numerous small short-lived high-latitude holes. High-latitude holes recurred with a synodic rotation period of 28-29 days instead of the 27-day period already known to be characteristic of low-latitude holes. A Bartels display of the occurrence of holes, wind speed, and geomagnetic activity is considered.

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