## 摘要

We present a comparison of the observed behavior of the F region ionosphere over Millstone Hill during the geomagnetically quiet and storm period on 16-23 March, 1990, with numerical model calculations from the time-dependent mathematical model of the Earth's ionosphere and plasmasphere. The effects of vibrationally excited N_{2}(v) and O_{2}(v) on the electron density and temperature are studied using the N_{2}(v) and O_{2}(v) Boltzmann and non-Boltzmann distribution assumptions. The deviations from the Boltzmann distribution for the first five vibrational levels of N_{2}(v) and O_{2}(v) were calculated. The present study suggests that these deviations are not significant at vibrational levels r = 1 and 2, and the calculated distributions of N_{2}(v) and O_{2}(v) are highly non-Boltzmann at vibrational levels v > 2. The N_{2}(v) and O_{2}(v) non-Boltzmann distribution assumption leads to the decrease of the calculated daytime NmF2 up to a factor of 1.44 (maximum value) in comparison with the N_{2}(v) and O_{2}(v) Boltzmann distribution assumption. The resulting effects of N_{2}(v > 0) and O_{2}(v > 0) on the NmF2 is the decrease of the calculated daytime NmF2 up to a factor of 2.8 (maximum value) for Boltzmann populations of N_{2}(v) and O_{2}(v) and up to a factor of 3.5 (maximum value) for non-Boltzmann populations of N_{2}(v) and O_{2}(v) . This decrease in electron density results in the increase of the calculated daytime electron temperature up to about 1040-1410 K (maximum value) at the F2 peak altitude giving closer agreement between the measured and modeled electron temperatures. Both the daytime and nighttime densities are not reproduced by the model without N_{2}(v > 0) and O_{2}(v > 0) , and inclusion of vibrationally excited N_{2} and O_{2}7 brings the model and data into better agreement. The effects of vibrationally excited O_{2} and N_{2} on the electron density and temperature are most pronounced during daytime.

原文 | English |
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頁（從 - 到） | 957-966 |

頁數 | 10 |

期刊 | Annales Geophysicae |

卷 | 18 |

發行號 | 8 |

DOIs | |

出版狀態 | Published - 2000 八月 |

## All Science Journal Classification (ASJC) codes

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