Energy Balance in the Flaring Solar Corona

Details Energy Balance in the Flaring Solar Corona Energy Balance in the Flaring Solar Corona

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsh42a0778w&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SH42A-0778

Physics

7519 Flares, 7536 Solar Activity Cycle (2162)

Scientific paper

Assuming only that flares derive their energy from a coronal source and that flaring is the dominant mechanism for depleting that source, the global coronal response time (time for flares to remove available coronal energy) is about 9 months. A detailed model for dynamic energy balance in the solar corona over the solar cycle is presented to describe how the magnetic free energy in the solar corona varies in response to changes in the supply of energy to the system and to changes in the flaring rate. The model predicts that both the flaring rate and the free energy of the system should lag behind the driving of the system because of the coronal response time (the model gives a lag of ~ 11 months). This effect may account for hysteresis phenomena between certain solar activity indices. For example, analysis of time series of monthly sunspot numbers and monthly numbers of soft X-ray flares over the years 1976 to 1999 indicates a tendency for flare numbers to lag behind sunspot numbers by ~ 6 months.

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