Mid-latitude Summer Nighttime Anomaly (MSNA) - Observations and model simulations

S. V. Thampi, N. Balan, C. Lin, H. Liu, M. Yamamoto

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)157-165
Number of pages9
JournalAnnales Geophysicae
Volume29
Issue number1
DOIs
Publication statusPublished - Jan 24 2011
Externally publishedYes

Fingerprint

summer
anomalies
anomaly
middle atmosphere
diurnal variations
simulation
upper atmosphere
Northern Hemisphere
diurnal variation
radar
electric field
plasmasphere
evening
noon
electric fields
wind velocity
longitude
ionospherics
ionospheres
dip

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Geology
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science

Cite this

Mid-latitude Summer Nighttime Anomaly (MSNA) - Observations and model simulations. / Thampi, S. V.; Balan, N.; Lin, C.; Liu, H.; Yamamoto, M.

In: Annales Geophysicae, Vol. 29, No. 1, 24.01.2011, p. 157-165.

Research output: Contribution to journalArticle

Thampi, S. V. ; Balan, N. ; Lin, C. ; Liu, H. ; Yamamoto, M. / Mid-latitude Summer Nighttime Anomaly (MSNA) - Observations and model simulations. In: Annales Geophysicae. 2011 ; Vol. 29, No. 1. pp. 157-165.
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