osIRIs, OH!

Limb Workshop May 2021

Anqi Li, Donal Murtagh, Kristell Perot, Ole Martin

Chris Roth, Adam Bourassa, Doug Degenstein

Chalmers University of Technology

University of Saskatchewan

OH nightglow

OSIRIS

= OS + IRI

OH (8-3)

OH (9-4)

OH (5-1)

OH (3-1)

Sheese et al. (2014)

Overview

SSW
Seasonal
Solar cycle signature

Zonal mean distributions

2001~2015(-ish)

OH nightglow

x 100000 orbits...

Coherent structures!

OH nightglow

Gaussian approx.

Peak intensity

Peak height

Thickness

SSW

Monthly zonal mean

SSW

Limpasuvan et al. 2016

SSW

Daily zonal mean

Sheese et al. 2014

SSW

IRI OH can be utilised to study SSW-ES!

ES: elevated stratopause

Seasonal Variability

AO

SAO

Note: NH is shifted by 6 months!

Seasonal Variability

AO

SAO

Peak intensity

Note: NH is shifted by 6 months!

Seasonal Variability

AO

SAO

Note: NH is shifted by 6 months!

Peak height

Thickness

Peak intensity

Seasonal Variability

SAO signature -- nice and clear
AO signature -- summer gap
Inter-hemispherical asymmetry

Solar cycle

- OH* intensity has a positive correlation with solar activity [Weill 1973, Batista et al. 1994, Pertsev 2009]

- Agree with SABER between 2002 - 2009

[Gao et al. 2010]

- Hmmm... with SCIAMACHY 2003 - 2011

[von Savigny 2015, Teiser and von Savigny 2017]

O_3 + H

OH* + O_2

(T)

Solar cycle

Seasonal var. removed

Intensity

Y10.7 index

Solar cycle

Unfortunately,

Odin LTAN has been drifted

6pm -> 7pm -> 6pm

Diurnal tides aliasing effect?

O_3 + H

OH* + O_2

(T)

Complicated, an open question

osIRIs, OH!

Great dataset to study

SSW
Seasonal variations
Solar cycle influence
and beyond...

Data will be made publicly available

Description paper will be submitted this week (or next...)

Supplemental plots

SSW