The Effect of Midnight Temperature Maximum Winds on Post‐Midnight Equatorial Spread F
Abstract The SAMI3/equatorial spread F (Sami3 is also a model of the ionosphere/ESF) code is used to simulate the growth of equatorial plasma bubbles in the presence of a background wind field based on measured winds. The measured winds exhibit the well‐known “midnight temperature maximum” (MTM) pat...
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| Format: | Article |
| Language: | English |
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Wiley
2021-08-01
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| Series: | Space Weather |
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| Online Access: | https://doi.org/10.1029/2021SW002728 |
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| author | J. Krall D. Hickey J. D. Huba P. B. Dandenault |
| author_facet | J. Krall D. Hickey J. D. Huba P. B. Dandenault |
| author_sort | J. Krall |
| collection | DOAJ |
| description | Abstract The SAMI3/equatorial spread F (Sami3 is also a model of the ionosphere/ESF) code is used to simulate the growth of equatorial plasma bubbles in the presence of a background wind field based on measured winds. The measured winds exhibit the well‐known “midnight temperature maximum” (MTM) pattern, in which an equatorward wind occurs simultaneously with a cessation in the zonal wind. The MTM is often preceded by strong equatorward winds (about 100 m/s). The circumstance where the MTM winds are symmetric across the equator is considered; here the meridional wind component in the southern hemisphere is the reverse of the northern meridional wind. The timing of the wind pattern relative to the imposition of a seed for the ESF instability is explored. We find that the simultaneous occurrence of a seed wave and a strong converging meridional wind pattern can produce post‐midnight ESF. We further find that the seed wave and the sudden cessation of the zonal winds can also produce post‐midnight ESF. The Magnetic mEridional NeuTrAl Thermospheric code verifies the occurrence of converging meridional wind patterns such as those simulated here, based on ionosonde data. Results suggest that regional‐scale wind measurements would aid in the prediction signal‐disrupting ionospheric bubbles. |
| format | Article |
| id | doaj-art-bc7dbdbe8d004c0b8714974ee39dccbe |
| institution | Kabale University |
| issn | 1542-7390 |
| language | English |
| publishDate | 2021-08-01 |
| publisher | Wiley |
| record_format | Article |
| series | Space Weather |
| spelling | doaj-art-bc7dbdbe8d004c0b8714974ee39dccbe2025-01-14T16:30:28ZengWileySpace Weather1542-73902021-08-01198n/an/a10.1029/2021SW002728The Effect of Midnight Temperature Maximum Winds on Post‐Midnight Equatorial Spread FJ. Krall0D. Hickey1J. D. Huba2P. B. Dandenault3Plasma Physics Division Naval Research Laboratory Washington DC USASpace Science Division Naval Research Laboratory Washington DC USASyntek Technologies Fairfax VA USAApplied Physics Laboratory Johns Hopkins University Laurel MD USAAbstract The SAMI3/equatorial spread F (Sami3 is also a model of the ionosphere/ESF) code is used to simulate the growth of equatorial plasma bubbles in the presence of a background wind field based on measured winds. The measured winds exhibit the well‐known “midnight temperature maximum” (MTM) pattern, in which an equatorward wind occurs simultaneously with a cessation in the zonal wind. The MTM is often preceded by strong equatorward winds (about 100 m/s). The circumstance where the MTM winds are symmetric across the equator is considered; here the meridional wind component in the southern hemisphere is the reverse of the northern meridional wind. The timing of the wind pattern relative to the imposition of a seed for the ESF instability is explored. We find that the simultaneous occurrence of a seed wave and a strong converging meridional wind pattern can produce post‐midnight ESF. We further find that the seed wave and the sudden cessation of the zonal winds can also produce post‐midnight ESF. The Magnetic mEridional NeuTrAl Thermospheric code verifies the occurrence of converging meridional wind patterns such as those simulated here, based on ionosonde data. Results suggest that regional‐scale wind measurements would aid in the prediction signal‐disrupting ionospheric bubbles.https://doi.org/10.1029/2021SW002728equatorial spread FESFionospherescintillationthermosphere wind |
| spellingShingle | J. Krall D. Hickey J. D. Huba P. B. Dandenault The Effect of Midnight Temperature Maximum Winds on Post‐Midnight Equatorial Spread F Space Weather equatorial spread F ESF ionosphere scintillation thermosphere wind |
| title | The Effect of Midnight Temperature Maximum Winds on Post‐Midnight Equatorial Spread F |
| title_full | The Effect of Midnight Temperature Maximum Winds on Post‐Midnight Equatorial Spread F |
| title_fullStr | The Effect of Midnight Temperature Maximum Winds on Post‐Midnight Equatorial Spread F |
| title_full_unstemmed | The Effect of Midnight Temperature Maximum Winds on Post‐Midnight Equatorial Spread F |
| title_short | The Effect of Midnight Temperature Maximum Winds on Post‐Midnight Equatorial Spread F |
| title_sort | effect of midnight temperature maximum winds on post midnight equatorial spread f |
| topic | equatorial spread F ESF ionosphere scintillation thermosphere wind |
| url | https://doi.org/10.1029/2021SW002728 |
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