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Observations of NO in the upper mesosphere and lower thermosphere during ECOMA 2010

Hedin, J. and Rapp, M. and Khaplanov, M. and Stegman, J. and Witt, G. (2012) Observations of NO in the upper mesosphere and lower thermosphere during ECOMA 2010. Annales Geophysicae (30), pp. 1611-1621. Copernicus Publications. doi: 10.5194/angeo-30-1611-2012.


Official URL: http://www.ann-geophys.net/30/1611/2012/angeo-30-1611-2012.pdf


In December 2010 the last campaign of the German-Norwegian sounding rocket project ECOMA (Existence and Charge state Of Meteoric smoke particles in the middle Atmosphere) was conducted from And�¸ya Rocket Range in northern Norway (69� N, 16� E) in connection with the Geminid meteor shower. The main instrument on board the rocket payloads was the ECOMA detector for studying meteoric smoke particles (MSPs) by active photoionization and subsequent detection of the produced charges (particles and photoelectrons). In addition to photoionizing MSPs, the energy of the emitted photons from the ECOMA flash-lamp is high enough to also photoionize nitric oxide (NO). Thus, around the peak of the NO layer, at and above the main MSP layer, photoelectrons produced by the photoionization of NO are expected to contribute to, or even dominate above the main MSP-layer, the total measured photoelectron current. Among the other instruments on board was a set of two photometers to study the O2 (b16+ g â��X36â�� g ) Atmospheric band and NO2 continuum nightglow emissions. In the absence of auroral emissions, these two nightglow features can be used together to infer NO number densities. This will provide a way to quantify the contribution of NO photoelectrons to the photoelectron current measured by the ECOMA instrument and, above the MSP layer, a simultaneous measurement of NO with two different and independent techniques. This work is still on-going due to the uncertainties, especially in the effort to quantitatively infer NO densities from the ECOMA photoelectron current, and the lack of simultaneous measurements of temperature and density for the photometric study. In this paper we describe these two techniques to infer NO densities and discuss the uncertainties. The peak NO number density inferred from the two photometers on ascent was 3.9��108 cmâ��3 at an altitude of about 99 km, while the concentration inferred from the ECOMA photoelectron measurement at this altitude was a factor of 5 smaller.

Item URL in elib:https://elib.dlr.de/79985/
Document Type:Article
Title:Observations of NO in the upper mesosphere and lower thermosphere during ECOMA 2010
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Hedin, J.Stockholm Univ., Stockholm, SEUNSPECIFIEDUNSPECIFIED
Khaplanov, M.Stockholm Univ., Stockholm, SUNSPECIFIEDUNSPECIFIED
Stegman, J.Stockholm Univ., Stockholm, SUNSPECIFIEDUNSPECIFIED
Witt, G.Stockholm Univ., Stockholm, SUNSPECIFIEDUNSPECIFIED
Journal or Publication Title:Annales Geophysicae
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In ISI Web of Science:Yes
Page Range:pp. 1611-1621
Publisher:Copernicus Publications
Keywords:Atmospheric composition and structure; Airglow and aurora; Middle atmosphere; Instruments and techniques
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Earth Observation
DLR - Research theme (Project):R - Atmospheric and climate research
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics
Deposited By: Freund, Jana
Deposited On:18 Dec 2012 11:56
Last Modified:08 Mar 2018 18:47

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