Short-period solar cycle signals in the ionosphere observed by FORMOSAT-3/COSMIC

Details Short-period solar cycle signals in the ionosphere observed by FORMOSAT-3/COSMIC Short-period solar cycle signals in the ionosphere observed by FORMOSAT-3/COSMIC

Aug 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3515818l&link_type=abstract

Geophysical Research Letters, Volume 35, Issue 15, CiteID L15818

Physics

8

Ionosphere: Solar Radiation And Cosmic Ray Effects, Ionosphere: Ion Chemistry And Composition (0335), Ionosphere: Ionospheric Dynamics

Scientific paper

We analyze 2 years of the FORMOSAT-3/COSMIC GPS radio occultation data to study the response of the Earth's ionosphere to the solar rotation (27-day) induced solar flux variations. Here we report electron density variations in the ionosphere (~100-500 km) associated with the 27-day solar cycle. The peak-to-peak variation in electron density at low latitudes in the F2 region is about ~104-105 electrons cm-3 or 20-40%, and can be as high as 60% depending on altitude, latitude, and season. The half and double periods of the 27-day are also observed at an amplitude comparable to that of the 27-day. The results place useful constraints for modeling chemical and dynamical processes in the ionosphere.

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