Geomagnetic storm effects at F1-layer heights from incoherent scatter observations
International audience Storm effects at F1-layer heights (160?200 km) were analyzed for the first time using Millstone Hill (mid-latitudes) and EISCAT (auroral zone) incoherent scatter (IS) observations. The morphological study has shown both increases (positive effect) and decreases (negative effec...
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ftccsdartic:oai:HAL:hal-00316999v1 2023-11-12T04:16:36+01:00 Geomagnetic storm effects at F1-layer heights from incoherent scatter observations Mikhailov, A. V. Schlegel, K. Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation (IZMIRAN) Russian Academy of Sciences Moscow (RAS) Max-Planck-Institut für Aeronomie (MPI Aeronomie) Max-Planck-Gesellschaft 2003 https://hal.science/hal-00316999 https://hal.science/hal-00316999/document https://hal.science/hal-00316999/file/angeo-21-583-2003.pdf en eng HAL CCSD European Geosciences Union hal-00316999 https://hal.science/hal-00316999 https://hal.science/hal-00316999/document https://hal.science/hal-00316999/file/angeo-21-583-2003.pdf info:eu-repo/semantics/OpenAccess ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00316999 Annales Geophysicae, 2003, 21 (2), pp.583-596 [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2003 ftccsdartic 2023-10-21T23:07:53Z International audience Storm effects at F1-layer heights (160?200 km) were analyzed for the first time using Millstone Hill (mid-latitudes) and EISCAT (auroral zone) incoherent scatter (IS) observations. The morphological study has shown both increases (positive effect) and decreases (negative effect) in electron concentration. Negative storm effects prevail for all seasons and show a larger magnitude than positive ones, the magnitude of the effect normally increasing with height. At Millstone Hill the summer storm effects are small compared to other seasons, but they are well detectable. At EISCAT this summer decrease takes place only with respect to the autumnal period and the autumn/spring asymmetry in the storm effects is well pronounced. Direct and significant correlation exists between deviations in electron concentration at the F1-layer heights and in the F2-layer maximum. Unlike the F2-layer the F1-region demonstrates a relatively small reaction to geomagnetic disturbances despite large perturbations in thermospheric parameters. Aeronomic parameters extracted from IS observations are used to explain the revealed morphology. A competition between atomic and molecular ion contributions to Ne variations was found to be the main physical mechanism controlling the F1-layer storm effect. The revealed morphology is shown to be related with neutral composition (O, O 2 , N 2 ) seasonal and storm-time variations. The present day understanding of the F1-region formation mechanisms is sufficient to explain the observed storm effects. Article in Journal/Newspaper EISCAT Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Mikhailov, A. V. Schlegel, K. Geomagnetic storm effects at F1-layer heights from incoherent scatter observations |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience Storm effects at F1-layer heights (160?200 km) were analyzed for the first time using Millstone Hill (mid-latitudes) and EISCAT (auroral zone) incoherent scatter (IS) observations. The morphological study has shown both increases (positive effect) and decreases (negative effect) in electron concentration. Negative storm effects prevail for all seasons and show a larger magnitude than positive ones, the magnitude of the effect normally increasing with height. At Millstone Hill the summer storm effects are small compared to other seasons, but they are well detectable. At EISCAT this summer decrease takes place only with respect to the autumnal period and the autumn/spring asymmetry in the storm effects is well pronounced. Direct and significant correlation exists between deviations in electron concentration at the F1-layer heights and in the F2-layer maximum. Unlike the F2-layer the F1-region demonstrates a relatively small reaction to geomagnetic disturbances despite large perturbations in thermospheric parameters. Aeronomic parameters extracted from IS observations are used to explain the revealed morphology. A competition between atomic and molecular ion contributions to Ne variations was found to be the main physical mechanism controlling the F1-layer storm effect. The revealed morphology is shown to be related with neutral composition (O, O 2 , N 2 ) seasonal and storm-time variations. The present day understanding of the F1-region formation mechanisms is sufficient to explain the observed storm effects. |
author2 |
Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation (IZMIRAN) Russian Academy of Sciences Moscow (RAS) Max-Planck-Institut für Aeronomie (MPI Aeronomie) Max-Planck-Gesellschaft |
format |
Article in Journal/Newspaper |
author |
Mikhailov, A. V. Schlegel, K. |
author_facet |
Mikhailov, A. V. Schlegel, K. |
author_sort |
Mikhailov, A. V. |
title |
Geomagnetic storm effects at F1-layer heights from incoherent scatter observations |
title_short |
Geomagnetic storm effects at F1-layer heights from incoherent scatter observations |
title_full |
Geomagnetic storm effects at F1-layer heights from incoherent scatter observations |
title_fullStr |
Geomagnetic storm effects at F1-layer heights from incoherent scatter observations |
title_full_unstemmed |
Geomagnetic storm effects at F1-layer heights from incoherent scatter observations |
title_sort |
geomagnetic storm effects at f1-layer heights from incoherent scatter observations |
publisher |
HAL CCSD |
publishDate |
2003 |
url |
https://hal.science/hal-00316999 https://hal.science/hal-00316999/document https://hal.science/hal-00316999/file/angeo-21-583-2003.pdf |
genre |
EISCAT |
genre_facet |
EISCAT |
op_source |
ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00316999 Annales Geophysicae, 2003, 21 (2), pp.583-596 |
op_relation |
hal-00316999 https://hal.science/hal-00316999 https://hal.science/hal-00316999/document https://hal.science/hal-00316999/file/angeo-21-583-2003.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1782333662042259456 |