Unusually strong NO descent in the Arctic middle atmosphere in early 2013
EPP refers to the process by which energetic particles affect the Earth’s atmosphere. Magnetospheric electrons can reach the mesosphere and lower thermosphere (MLT) during geomagnetic perturbations and generate large amounts of nitric oxide (NO) in the polar regions. In winter conditions, EPP-NO can...
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| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1031.8696 http://seom.esa.int/LPS13/75f61111/poster_KP_ESALivingPlanet2013.pdf |
| Summary: | EPP refers to the process by which energetic particles affect the Earth’s atmosphere. Magnetospheric electrons can reach the mesosphere and lower thermosphere (MLT) during geomagnetic perturbations and generate large amounts of nitric oxide (NO) in the polar regions. In winter conditions, EPP-NO can be transported down to the stratosphere by the meridional circulation. This mechanism is called EPP indirect effect (EPP IE) [1]. EPP-IE is controlled by space weather and meteorology. It depends on:- EPP-NO production, as inferred from the Ap index, which is linked to solar variability,- Dynamical activity (transport). EPP represents therefore an important solar-terrestrial coupling mechanism. Exceptional dynamical conditions, such as the occurrence of a major stratospheric sudden warming (SSW) in the middle of the winter, can lead to surprisingly strong EPP IE. |
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