Solar activity signatures in mesopause region temperatures and atomic oxygen related airglow brightness at El Leoncito, Argentina

Rotational temperatures and airglow brightness variations of the OH(6-2) and O2(0-1) bands measured at El Leoncito (32°S, 69°W) from 1998 to 2002 are analysed to detect solar activity signatures. The emissions correspond to nominal altitudes of 87 and 95 km, respectively. The homogeneous and consist...

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Autores principales: Scheer, J., Reisin, E.R., Mandrini, C.H.
Formato: JOUR
Materias:
Airglow
Mesopause region
Solar activity
Southern
Temperature
Trends
Correlation methods
Data acquisition
Dynamics
Light emission
Modulation
Solar absorbers
Temperature control
Brightness
Nominal altitudes
Solar activity signatures
Solar radiation
airglow
mesopause
solar activity
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_13646826_v67_n1-2_p145_Scheer
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_13646826_v67_n1-2_p145_Scheer2023-10-03T16:11:10Z Solar activity signatures in mesopause region temperatures and atomic oxygen related airglow brightness at El Leoncito, Argentina Scheer, J. Reisin, E.R. Mandrini, C.H. Airglow Mesopause region Solar activity Southern Temperature Trends Correlation methods Data acquisition Dynamics Light emission Modulation Solar absorbers Temperature control Airglow Brightness Nominal altitudes Solar activity signatures Solar radiation airglow mesopause solar activity Rotational temperatures and airglow brightness variations of the OH(6-2) and O2(0-1) bands measured at El Leoncito (32°S, 69°W) from 1998 to 2002 are analysed to detect solar activity signatures. The emissions correspond to nominal altitudes of 87 and 95 km, respectively. The homogeneous and consistent data set covers the rise, the two distinct maxima, and the start of the decline of the present solar activity cycle. The modulation of solar activity around the Gnevyshev gap (particularly pronounced in this cycle) has been so strong as to motivate the expectation to detect its signature in such a relatively short data set. While at 87 km, we practically observe no correlation with solar radio flux, or at most a weak correlation in temperature, we find a moderate positive temperature and airglow brightness effect at 95 km. This is a remarkable difference, in view of the small separation between the two altitude levels. The quantitative results lie close to the lower limits of our previous estimates in a recent trend analysis. However, the behaviour at 95 km changes abruptly between anticorrelation, correlation, and no correlation. From December 1998 to July 2001 the correlation was very strong. From the standpoint of atmospheric nonlinear dynamics, variations in the degree of correlation in different years and at different observing sites should not be surprising. © 2004 Elsevier Ltd. All rights reserved. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_13646826_v67_n1-2_p145_Scheer
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Airglow
Mesopause region
Solar activity
Southern
Temperature
Trends
Correlation methods
Data acquisition
Dynamics
Light emission
Modulation
Solar absorbers
Temperature control
Airglow
Brightness
Nominal altitudes
Solar activity signatures
Solar radiation
airglow
mesopause
solar activity
spellingShingle Airglow
Mesopause region
Solar activity
Southern
Temperature
Trends
Correlation methods
Data acquisition
Dynamics
Light emission
Modulation
Solar absorbers
Temperature control
Airglow
Brightness
Nominal altitudes
Solar activity signatures
Solar radiation
airglow
mesopause
solar activity
Scheer, J.
Reisin, E.R.
Mandrini, C.H.
Solar activity signatures in mesopause region temperatures and atomic oxygen related airglow brightness at El Leoncito, Argentina
topic_facet Airglow
Mesopause region
Solar activity
Southern
Temperature
Trends
Correlation methods
Data acquisition
Dynamics
Light emission
Modulation
Solar absorbers
Temperature control
Airglow
Brightness
Nominal altitudes
Solar activity signatures
Solar radiation
airglow
mesopause
solar activity
description Rotational temperatures and airglow brightness variations of the OH(6-2) and O2(0-1) bands measured at El Leoncito (32°S, 69°W) from 1998 to 2002 are analysed to detect solar activity signatures. The emissions correspond to nominal altitudes of 87 and 95 km, respectively. The homogeneous and consistent data set covers the rise, the two distinct maxima, and the start of the decline of the present solar activity cycle. The modulation of solar activity around the Gnevyshev gap (particularly pronounced in this cycle) has been so strong as to motivate the expectation to detect its signature in such a relatively short data set. While at 87 km, we practically observe no correlation with solar radio flux, or at most a weak correlation in temperature, we find a moderate positive temperature and airglow brightness effect at 95 km. This is a remarkable difference, in view of the small separation between the two altitude levels. The quantitative results lie close to the lower limits of our previous estimates in a recent trend analysis. However, the behaviour at 95 km changes abruptly between anticorrelation, correlation, and no correlation. From December 1998 to July 2001 the correlation was very strong. From the standpoint of atmospheric nonlinear dynamics, variations in the degree of correlation in different years and at different observing sites should not be surprising. © 2004 Elsevier Ltd. All rights reserved.
format JOUR
author Scheer, J.
Reisin, E.R.
Mandrini, C.H.
author_facet Scheer, J.
Reisin, E.R.
Mandrini, C.H.
author_sort Scheer, J.
title Solar activity signatures in mesopause region temperatures and atomic oxygen related airglow brightness at El Leoncito, Argentina
title_short Solar activity signatures in mesopause region temperatures and atomic oxygen related airglow brightness at El Leoncito, Argentina
title_full Solar activity signatures in mesopause region temperatures and atomic oxygen related airglow brightness at El Leoncito, Argentina
title_fullStr Solar activity signatures in mesopause region temperatures and atomic oxygen related airglow brightness at El Leoncito, Argentina
title_full_unstemmed Solar activity signatures in mesopause region temperatures and atomic oxygen related airglow brightness at El Leoncito, Argentina
title_sort solar activity signatures in mesopause region temperatures and atomic oxygen related airglow brightness at el leoncito, argentina
url http://hdl.handle.net/20.500.12110/paper_13646826_v67_n1-2_p145_Scheer
work_keys_str_mv AT scheerj solaractivitysignaturesinmesopauseregiontemperaturesandatomicoxygenrelatedairglowbrightnessatelleoncitoargentina
AT reisiner solaractivitysignaturesinmesopauseregiontemperaturesandatomicoxygenrelatedairglowbrightnessatelleoncitoargentina
AT mandrinich solaractivitysignaturesinmesopauseregiontemperaturesandatomicoxygenrelatedairglowbrightnessatelleoncitoargentina
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