The 27 day solar rotational effect on mesospheric nighttime OH and O₃ observations induced by geomagnetic activity.

ABSTRACT: Observations performed by the Earth Observing System Microwave Limb Sounder instrument on board the Aura satellite from 2004 to 2009 (2004 to 2014) were used to investigate the 27 day solar rotational cycle in mesospheric OH (O₃) and the physical connection to geomagnetic activity. Data analysis was focused on nighttime measurements at geomagnetic latitudes connected to the outer radiation belts (55°N/S-75°N/S). The applied superposed epoch analysis reveals a distinct 27 day solar rotational signal in OH and O₃ during winter in both hemispheres at altitudes >70 km. The OH response is positive and in-phase with the respective geomagnetic activity signal, lasting for 1-2 days. In contrast, the O₃ feedback is negative, delayed by 1 day, and is present up to 4 

SUBMITTER: Fytterer T 

PROVIDER: S-EPMC5054829 | biostudies-literature | 2015 Sep

REPOSITORIES: biostudies-literature