Mid-latitude Summer Nighttime Anomaly (MSNA) – observations and model simulations
In this paper, we present model simulations of the Mid-latitude Summer Nighttime Anomaly (MSNA) in the Northern Hemisphere, which is characterized by noon-time dip and evening maximum in the diurnal variation of the ionospheric density. The simulations are carried out using SUPIM (Sheffield Univ...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2011-01-01
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| Series: | Annales Geophysicae |
| Online Access: | https://www.ann-geophys.net/29/157/2011/angeo-29-157-2011.pdf |
| _version_ | 1819180697870401536 |
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| author | S. V. Thampi N. Balan C. Lin H. Liu M. Yamamoto |
| author_facet | S. V. Thampi N. Balan C. Lin H. Liu M. Yamamoto |
| author_sort | S. V. Thampi |
| collection | DOAJ |
| description | In this paper, we present model simulations of the Mid-latitude Summer
Nighttime Anomaly (MSNA) in the Northern Hemisphere, which is characterized
by noon-time dip and evening maximum in the diurnal variation of the
ionospheric density. The simulations are carried out using SUPIM (Sheffield
University Plasmasphere Ionosphere Model) for solar minimum at 135° E
longitude where MSNA is most pronounced in the Northern Hemisphere. The
simulations are used to understand the relative importance of electric
fields, and zonal and meridional winds in the formation of MSNA. The wind
velocities measured by the Middle and Upper atmosphere radar (MU radar) and
those obtained from the horizontal wind model (HWM93) are used. The results
show that the formation of MSNA is closely related to the diurnal variation
of the neutral winds with little contribution from the changes in the
electric fields. The observed features of MSNA are better reproduced when MU
radar winds are used as model input rather than HWM winds. |
| first_indexed | 2024-12-22T22:18:28Z |
| format | Article |
| id | doaj.art-bf60ab305eb74fccabaa8a5fe2aef542 |
| institution | Directory Open Access Journal |
| issn | 0992-7689 1432-0576 |
| language | English |
| last_indexed | 2024-12-22T22:18:28Z |
| publishDate | 2011-01-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Annales Geophysicae |
| spelling | doaj.art-bf60ab305eb74fccabaa8a5fe2aef5422022-12-21T18:10:43ZengCopernicus PublicationsAnnales Geophysicae0992-76891432-05762011-01-012915716510.5194/angeo-29-157-2011Mid-latitude Summer Nighttime Anomaly (MSNA) – observations and model simulationsS. V. Thampi0N. Balan1C. Lin2H. Liu3M. Yamamoto4Research Institute for Sustainable Humanosphere (RISH), Kyoto University, 611-0011, JapanResearch Institute for Sustainable Humanosphere (RISH), Kyoto University, 611-0011, JapanDepartment of Earth Science, National Cheng Kung University, Tainan, TaiwanResearch Institute for Sustainable Humanosphere (RISH), Kyoto University, 611-0011, JapanResearch Institute for Sustainable Humanosphere (RISH), Kyoto University, 611-0011, JapanIn this paper, we present model simulations of the Mid-latitude Summer Nighttime Anomaly (MSNA) in the Northern Hemisphere, which is characterized by noon-time dip and evening maximum in the diurnal variation of the ionospheric density. The simulations are carried out using SUPIM (Sheffield University Plasmasphere Ionosphere Model) for solar minimum at 135° E longitude where MSNA is most pronounced in the Northern Hemisphere. The simulations are used to understand the relative importance of electric fields, and zonal and meridional winds in the formation of MSNA. The wind velocities measured by the Middle and Upper atmosphere radar (MU radar) and those obtained from the horizontal wind model (HWM93) are used. The results show that the formation of MSNA is closely related to the diurnal variation of the neutral winds with little contribution from the changes in the electric fields. The observed features of MSNA are better reproduced when MU radar winds are used as model input rather than HWM winds.https://www.ann-geophys.net/29/157/2011/angeo-29-157-2011.pdf |
| spellingShingle | S. V. Thampi N. Balan C. Lin H. Liu M. Yamamoto Mid-latitude Summer Nighttime Anomaly (MSNA) – observations and model simulations Annales Geophysicae |
| title | Mid-latitude Summer Nighttime Anomaly (MSNA) – observations and model simulations |
| title_full | Mid-latitude Summer Nighttime Anomaly (MSNA) – observations and model simulations |
| title_fullStr | Mid-latitude Summer Nighttime Anomaly (MSNA) – observations and model simulations |
| title_full_unstemmed | Mid-latitude Summer Nighttime Anomaly (MSNA) – observations and model simulations |
| title_short | Mid-latitude Summer Nighttime Anomaly (MSNA) – observations and model simulations |
| title_sort | mid latitude summer nighttime anomaly msna observations and model simulations |
| url | https://www.ann-geophys.net/29/157/2011/angeo-29-157-2011.pdf |
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