Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm54b..04s&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SM54B-04
Astronomy and Astrophysics
Astrophysics
[0358] Atmospheric Composition And Structure / Thermosphere: Energy Deposition, [2431] Ionosphere / Ionosphere/Magnetosphere Interactions, [7511] Solar Physics, Astrophysics, And Astronomy / Coronal Holes, [7969] Space Weather / Satellite Drag
Scientific paper
The upper atmosphere and ionosphere exhibit substantial variation in response to forcing by the solar wind and the interplanetary magnetic field. Major changes are often associated with eruptive events on the Sun, which occur more frequently at high solar activity and during the declining phase of the solar cycle. However, there has been recent appreciation of the importance of periodic fluctuations in the thermosphere-ionosphere system at lower levels of activity, and even at solar minimum. These fluctuations may be associated with regions of enhanced solar wind velocity known as high-speed streams, which are thought to be driven by regions of "open" magnetic flux in the solar corona sometimes called "coronal holes" due to their darker appearance on EUV images of the Sun. This paper presents measurement analysis and model simulations to demonstrate that thermosphere-ionosphere changes at solar minimum are indeed proportionally large, even compared with variability at solar maximum, but that the direct association with high-speed streams is overly simplistic, due to the crucial role played by the interplanetary magnetic field in magnetosphere-ionosphere coupling.
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