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| Titel |
Magnotospheric imaging of high latitude ion outflows |
| VerfasserIn |
D. E. Garrido, R. M. Robinson, Y. T. Chiu, H. L. Collin, R. W. Smith, D. W. Swift |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 12, no. 2/3 ; Nr. 12, no. 2/3, S.169-182 |
| Datensatznummer |
250010318
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| Publikation (Nr.) |
 copernicus.org/angeo-12-169-1994.pdf |
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| Zusammenfassung |
| High latitude ion outflows mostly consist of
upward streaming O+ and He+ emanating from the ionosphere.
At heights above 1000 km, these flows consist of cold and hot components which
resonantly scatter solar extreme ultraviolet (EUV) light, however, the ion
populations respond differently to Doppler shifting resulting from the large
relative velocities between the ions and the Sun. The possibility of optical
detection of the Doppler effect on the scattering rate will be discussed for the
O+ (83.4 nm) ions. We have contrasted the EUV solar resonance images
of these outflows by simulations of the 30.4 nm He+ and 83.4 nm O+
emissions for both quiet and disturbed geomagnetic conditions. Input data for
the 1000 km level has been obtained from the EICS instrument aboard the Dynamics
Explorer satellite. Our results show emission rates of 50 and 56 milli-Rayleighs
at 30.4 nm for quiet and disturbed conditions and 65 and 75 milli-Rayleighs at
83.4 nm for quiet and disturbed conditions, respectively, obtained for a polar
orbiting satellite and viewing radially outward. We also find that an imager at
an equatorial distance of 9 RE or more is in a favourable
position for detecting ion outflows, particularly when the plasmapause is
depressed in latitude. However, an occultation disk is necessary to obscure the
bright plasmaspheric emissions. |
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