The Arctic middle atmosphere was affected by major sudden stratospheric warmings (SSW)
in February 2018 and January 2019, respectively. In this article, we report for the first time …

The middle atmosphere was affected by an exceptionally strong midwinter stratospheric
sudden warming (SSW) during the Arctic winter 2012/2013. These unusual meteorological …

A reservoir of nitric oxide (NO) in the lower thermosphere efficiently cools the atmosphere
after periods of enhanced geomagnetic activity. Transport from this reservoir to the …

Energetic electron precipitation leads to increased nitric oxide (NO) production in the
mesosphere and lower thermosphere. NO distributions in the wintertime, high‐latitude …

The Arctic winter 2015–2016 was characterized by exceptionally low stratospheric
temperatures, favouring the formation of polar stratospheric clouds (PSCs) from mid …

The Arctic winter 2015/16 was characterized by exceptionally low stratospheric
temperatures, favouring the formation of polar stratospheric clouds (PSCs) from mid …

We analyze the 2019 sudden stratospheric warming event that occurred in the Southern
Hemisphere through its impact on the Antarctic ozone. Using temperature, ozone, and nitric …

Nitric oxide (NO) produced in the polar middle and upper atmosphere by energetic particle
precipitation depletes ozone in the mesosphere and, following vertical transport in the winter …

Measurements by the Atmospheric Chemistry Experiment show that the amount of NOx
(NO+ NO2) produced by energetic particle precipitation (EPP) that descended from the …

During winter 2015/2016, the Arctic stratosphere was characterized by extraordinarily low
temperatures in connection with a very strong polar vortex and with the occurrence of …