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In situ observation |
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DE1 satellite, Akebono satellite, etc. |
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Optical observation |
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MSX satellite |
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Romick et al. [1999] |
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Using MSX satellite, they observed solar
resonance fluorescence of N2+ ion above 450 km at the Northern
polar cap. |
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Optical ground based observation of N2+
1st negative bands resonant scattering. |
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We may monitor cusp structure. |
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We may understand structure of ion
heating/acceleration region and mechanisms of molecular ion upflow. |
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Period: |
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25 Nov. 2000〜9 Dec. 2000 |
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Location: |
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Longyearbyen Auroral station |
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Geographic coordinate 78ﾟ,12′,086″N,15ﾟ,49′,893″E |
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Invariant latitude 75ﾟ18′N |
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Simultaneous observation of 2 wave lengths (6 channels) |
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427.8nm (N2+1st negative) |
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557.7nm (OI) |
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Exposure: 1min. |
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Calculation |
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Pick up
geomagnetic meridian data. |
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Estimate the distance until the aurora using a
peak of 557.7 emission. |
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Obtain altitude profile of N2+
emission. |
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From data obtained at day time, we can know
relation between solar zenith angle and intensity at the zenith. |
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To differentiate the data, intensities of N2+
emission at each altitude are estimated. |
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N2+ 1st
negative bands emission at several hundred km altitudes in aurora region
could be observed from ground. |
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We may be able to monitor ion dynamics in the
topside ionosphere using N2+
1st negative bands emission. |
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To observe N2+ emission in the cusp region |
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Improve method of analysis and instrument of
observation. |
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ノート