Thermospheric wind observed by GOCE: Wind jets and seasonal variations

Huixin Liu, Eelco Doornbos, Junichiro Nakashima

研究成果: Contribution to journalArticle査読

19 被引用数 (Scopus)

抄録

Four years of GOCE observation near ∼250 km altitude during 2010–2013 provide a large data set for examining winds near dawn and dusk. The analysis has revealed interesting new features on the spatial and seasonal variation of the quiet time F region wind. (1) The wind structure in equatorial regions is aligned with the dip equator in all seasons but June solstice, forming a strong eastward jet in the evening sector but a weak westward jet in the morning sector. This demonstrates a magnetic control of the thermospheric wind. (2) The equatorial evening eastward wind reaches over 120 m/s in December but drops below 90 m/s in June. This weak wind likely leads to the frequently observed weak prereversal enhancement in June. (3) At middle latitudes, winds experience a marked annual variation but with opposite phase between the evening and morning sectors. The evening eastward wind maximizes in local winter (∼140 m/s) and minimizes in local summer (∼60 m/s), while the morning westward wind behaves vice versa. This annual variation may be attributed to the Midlatitude Summer Night Anomaly. (4) Although HWM14 empirical wind model significantly improved over HWM07, neither captures the wind's alignment with the dip equator. This leads to large underestimation of zonal winds by over 50 m/s at low latitudes in the evening sector at all longitudes in all seasons. Care should thus be taken when using HWMs to drive physical models, as they likely produce weaker upward plasma drift.

本文言語英語
ページ(範囲)6901-6913
ページ数13
ジャーナルJournal of Geophysical Research: Space Physics
121
7
DOI
出版ステータス出版済み - 7 1 2016

All Science Journal Classification (ASJC) codes

  • 宇宙惑星科学
  • 地球物理学

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