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7 February 2008

SOFIE measurements are being used to examine hemispheric differences in PMCs and their environment. The figure shows SOFIE results for the northern summer of 2007, and the southern sumer of 2007/08. Ice is more frequent and appears about 10 days earlier in the north compared to the south. The altitude of peak extinction (Zmax) for southern PMCs is about 3 km higher, consistent with the southern mesopause being about 3 km higher than in the north. Northern PMCs have greater ice mass densities, and are characterized by slightly more aspherical particles, than in the south. Water vapor measurements at Zmax are similar in the north and south.

Credit: Solar Occultation For Ice Experiment data processing team at GATS, Inc.


SOFIE measurement comparison plot

PMCs South Pole

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