Annales Geophysicae
Annales Geophysicae
ANGEO
Articles | Volume 41, issue 2
Articles | Volume 41, issue 2
https://doi.org/10.5194/angeo-41-289-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
Special issue:
https://doi.org/10.5194/angeo-41-289-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 41, issue 2
Regular paper
 | 
24 Jul 2023
Regular paper |  | 24 Jul 2023

Greenhouse gas effects on the solar cycle response of water vapour and noctilucent clouds

Ashique Vellalassery, Gerd Baumgarten, Mykhaylo Grygalashvyly, and Franz-Josef Lübken

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Short summary
The solar cycle affects the H2O concentration in the upper mesosphere mainly in two ways: directly through photolysis and, at the time and place of NLC formation, indirectly through temperature changes. The H2O–Lyman-α response is modified by NLC formation, resulting in a positive response at the ice formation region (due to the temperature change effect on the ice formation rate) and a negative response at the sublimation zone (due to the photolysis effect).
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Special issue on the joint 20th International EISCAT Symposium...