| タイトル | Ion composition and drift observations in the nighttime equatorial ionosphere |
| 本文（外部サイト） | http://hdl.handle.net/2060/19740009003 |
| 著者（英） | Aikin, A. C.; Goldberg, R. A.; Murthy, B. V. K. |
| 著者所属（英） | NASA Goddard Space Flight Center |
| 発行日 | 1974-02-01 |
| 言語 | eng |
| 内容記述 | The first in situ measurements of ion composition in the nighttime equatorial E and F region ionospheres (90-300 km) are presented and discussed. These profiles were obtained by two rocket-borne ion mass spectrometers launched from Thumba, India on March 9-10, 1970 at solar zenith angles of 112 deg and 165 deg. Ionosonde data established that the composition was measured at times bounding a period of F region downward drift. During this period the ions O(+) and N(+) were enhanced by one to three orders of magnitude between 220 and 300 km. Below the drift region (200 km), O(+) ceased to be the major ionic constituent, but the concentrations of O(+) and N(+) remained larger than predicted from known radiation sources and loss processes. Here also, both the O2(+) and NO(+) profiles retained nearly the same shape and magnitude throughout the night in agreement with theories assuming scattered UV radiation to be the maintaining source. Light metallic ions including Mg(+), Na(+) and possibly Si(+) were observed to altitude approaching 300 km, while the heavier ions Ca(+) and K(+) were seen in reduced quantity to 200 km. All metal ion profiles exhibited changes which can be ascribed to vertical drifting. |
| NASA分類 | GEOPHYSICS |
| レポートNO | 74N17116
NASA-TM-X-70593
X-625-74-50 |
| 権利 | No Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/195797 |
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