Based on IMAGE Data

Sandel, Bill R., King, R. A., Forrester, W. T., Gallagher, Dennis L., Broadfoot, A. L., & Curtis, C. C. (2001). Initial results from the IMAGE Extreme Ultraviolet Imager. Geophysical Research Letters, 28(8), 1439-1442. https://doi.org/10.1029/2001gl012885