The Maunder Minimum Ionosphere

Details The Maunder Minimum Ionosphere The Maunder Minimum Ionosphere

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsa11a1105s&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SA11A-1105

Other

7536 Solar Activity Cycle (2162), 2419 Ion Chemistry And Composition (0335), 2447 Modeling And Forecasting, 2479 Solar Radiation And Cosmic Ray Effects

Scientific paper

The Maunder Minimum epoch, from 1645 to 1715 A.D. was characterized by a near absence of sunspots. Studies of cosmogenic isotopes and Sun-like stars suggest that solar chromospheric and coronal emissions during this period were significantly lower than contemporary solar minima. To study the effect of such a reduction on the Earth's upper atmosphere, we employ a 1-D global average ionosphere and thermosphere model that accounts for the photon flux between 3 and 360 nm. Within the ionosphere, an unexpected transition occurs as the irradiance falls below normal solar minimum levels. The concentration of O+ ions decreases rapidly relative to the other ions, such that NO+ becomes the dominant F-region ion. The state of the underlying thermosphere, particularly the neutral gas temperature, is largely responsible for this behavior.

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