Unexpected East-West effect in mesopause region SABER temperatures over El Leoncito

We find that mesopause region temperatures determined by the SABER instrument on the TIMED satellite during nocturnal overpasses at El Leoncito (31.8°S, 69.3°W) are several kelvins higher when SABER observes from the East than when it observes from the West. We distinguish between altitudes correspo...

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Detalles Bibliográficos
Publicado: 2017
Materias:
Airglow
Mesopause region
Rotational temperature
SABER temperature
Semidiurnal tide
South Atlantic Anomaly
Earth atmosphere
Emission height
Ground-based data
South atlantic anomalies
Temperature differences
Temporal sampling
Geophysics
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_13646826_v157-158_n_p35_Reisin
http://hdl.handle.net/20.500.12110/paper_13646826_v157-158_n_p35_Reisin
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_13646826_v157-158_n_p35_Reisin
record_format dspace
spelling paper:paper_13646826_v157-158_n_p35_Reisin2023-06-08T16:11:50Z Unexpected East-West effect in mesopause region SABER temperatures over El Leoncito Airglow Mesopause region Rotational temperature SABER temperature Semidiurnal tide South Atlantic Anomaly Earth atmosphere Airglow Emission height Ground-based data Mesopause region Rotational temperature South atlantic anomalies Temperature differences Temporal sampling Geophysics We find that mesopause region temperatures determined by the SABER instrument on the TIMED satellite during nocturnal overpasses at El Leoncito (31.8°S, 69.3°W) are several kelvins higher when SABER observes from the East than when it observes from the West. We distinguish between altitudes corresponding to the nominal emission heights of the OH and O2 airglow layers. The East-West temperature differences of 4.5 K obtained for OH-equivalent height, and of 3.5 K for O2-equivalent height are surprising, because an effect of the South Atlantic Anomaly on SABER temperature is unexpected. However, the ground-based data obtained with our airglow spectrometer at El Leoncito show that such a SABER artifact can be ruled out. Rather, the phenomenon is explained as a consequence of the temporal sampling of the nocturnal variation, which is mostly due to the semidiurnal tide. The monthly mean tide is strongest from April to September with a mean amplitude of 6.9 K for OH, and of 10.5 K for O2 rotational temperature, but the contribution to the East-West effect varies strongly from month to month because of differences in the temporal sampling. This mechanism should be active at other sites, as well. © 2017 Elsevier Ltd 2017 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_13646826_v157-158_n_p35_Reisin http://hdl.handle.net/20.500.12110/paper_13646826_v157-158_n_p35_Reisin
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
Rotational temperature
SABER temperature
Semidiurnal tide
South Atlantic Anomaly
Earth atmosphere
Airglow
Emission height
Ground-based data
Mesopause region
Rotational temperature
South atlantic anomalies
Temperature differences
Temporal sampling
Geophysics
spellingShingle Airglow
Mesopause region
Rotational temperature
SABER temperature
Semidiurnal tide
South Atlantic Anomaly
Earth atmosphere
Airglow
Emission height
Ground-based data
Mesopause region
Rotational temperature
South atlantic anomalies
Temperature differences
Temporal sampling
Geophysics
Unexpected East-West effect in mesopause region SABER temperatures over El Leoncito
topic_facet Airglow
Mesopause region
Rotational temperature
SABER temperature
Semidiurnal tide
South Atlantic Anomaly
Earth atmosphere
Airglow
Emission height
Ground-based data
Mesopause region
Rotational temperature
South atlantic anomalies
Temperature differences
Temporal sampling
Geophysics
description We find that mesopause region temperatures determined by the SABER instrument on the TIMED satellite during nocturnal overpasses at El Leoncito (31.8°S, 69.3°W) are several kelvins higher when SABER observes from the East than when it observes from the West. We distinguish between altitudes corresponding to the nominal emission heights of the OH and O2 airglow layers. The East-West temperature differences of 4.5 K obtained for OH-equivalent height, and of 3.5 K for O2-equivalent height are surprising, because an effect of the South Atlantic Anomaly on SABER temperature is unexpected. However, the ground-based data obtained with our airglow spectrometer at El Leoncito show that such a SABER artifact can be ruled out. Rather, the phenomenon is explained as a consequence of the temporal sampling of the nocturnal variation, which is mostly due to the semidiurnal tide. The monthly mean tide is strongest from April to September with a mean amplitude of 6.9 K for OH, and of 10.5 K for O2 rotational temperature, but the contribution to the East-West effect varies strongly from month to month because of differences in the temporal sampling. This mechanism should be active at other sites, as well. © 2017 Elsevier Ltd
title Unexpected East-West effect in mesopause region SABER temperatures over El Leoncito
title_short Unexpected East-West effect in mesopause region SABER temperatures over El Leoncito
title_full Unexpected East-West effect in mesopause region SABER temperatures over El Leoncito
title_fullStr Unexpected East-West effect in mesopause region SABER temperatures over El Leoncito
title_full_unstemmed Unexpected East-West effect in mesopause region SABER temperatures over El Leoncito
title_sort unexpected east-west effect in mesopause region saber temperatures over el leoncito
publishDate 2017
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_13646826_v157-158_n_p35_Reisin
http://hdl.handle.net/20.500.12110/paper_13646826_v157-158_n_p35_Reisin
_version_ 1768545662749638656

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