Polar thermosphere-stratosphere photochemical coupling experiment: Two rocket measurements in polar winter at 69°N

Naomoto Iwagami, Hiromasa Yamamoto, Ken ichi Yajima, Hiroyuki Sekiguchi, Takashi Watanabe, Katsuhisa Suzuki, Kazuo Shibasaki, Hiroshi Amemiya, Masayuki Yamamoto, Takayuki Ono

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Two rocket experiments were carried out just before and after the polar night at Andoya (69°N), Norway to investigate transport of nitric oxide produced by auroral processes into the middle atmosphere and its influence on the ozone chemistry. Nitric oxide densities of (2-5)x108 cm-3 found in the 70-90 km region are one to two orders of magnitude larger than those at middle latitudes. The measured density profiles appear to agree semi-quantitatively with model simulations which includes auroral processes. The influence on ozone densities in the 70-90 km region due to such enhanced nitric oxide abundance is found to be still insignificant as compared to that due to transport in the middle of February, one month after the end of polar night and one month before the spring equinox. The larger ozone densities found in February (in spite of longer sunlit duration) than in November in the 40-60 km region again support predominance of transport over photochemical destruction.

Original languageEnglish
Pages (from-to)745-753
Number of pages9
Journalearth, planets and space
Volume50
Issue number9
DOIs
Publication statusPublished - 1998

ASJC Scopus subject areas

  • Geology
  • Space and Planetary Science

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