Indices of photospheric activity as reconstructed sunspot blocking (essentially sunspot areas) are compared with the White and Livingston 1Å Ca II K index and a polarization-brightness index of the corona that is proportional to mean hemispheric coronal electron density. The photospheric, chromospheric and coronal manifestations of magnetic activity associated with the solar cycle show quite similar behavior. The modulation properties of each index are remarkably similar both in terms of cycle signal-to-noise and the morphology of scatter variations with respect to cycle phase. The coronal electron density shows a more rapid rise from solar minimum to maximum than the activity indicators from lower atmospheric levels - suggesting a difference in growth rates for the large scale structures influencing the corona with respect to the smaller scale photospheric features.
All Science Journal Classification (ASJC) codes
- Aerospace Engineering
- Astronomy and Astrophysics
- Atmospheric Science
- Space and Planetary Science
- Earth and Planetary Sciences(all)