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- W1545822122 abstract "With dayside auroral observations we may probe the spatial and temporal structure of solar wind-magnetosphere coupling during intervals when the IMF has a substantial By component. This work captures some of the magnetosphere-ionosphere features expected to be present when the Earth is embedded in corotating solar wind streams. Specifically, we examine auroral observations made at 76° magnetic latitude to distinguish spatial from temporal magnetosphere features. To this end, we examine how the aurora changes as the station rotates with the Earth under a stationary magnetosphere structure during intervals of quasi-steady IMF orientation. Characterisitic features of the dayside aurora as a function of IMF orientation may be grouped as follows. (I) Strongly northward IMF: elongated cusp arc within 75-80°, associated with sunward convection in the polar cap. (II) Strongly southward IMF: elongated, narrow, and stable cusp arc within 70-75°, and an ionospheric convection symmetric about noon. (III) Southwest(east) IMF with |B y /B z | ≥ 1: (i) near-simultaneous auroral brightenings on field lines convecting noonward in the pre- and postnoon sectors. These are separated by a stable, but strongly attenuated, cusp aurora near noon. The polar convection is asymmetric; (ii) pre- and postnoon brightenings followed by noonward expansions accompanied by poleward moving auroral forms; (iii) strong auroral forms at the polar cap boundary on old, open field lines associated with a newly-discovered flow channel. Deflections in local ground magnetometers are seen whose cause is this flow channel. The phenomena under (iii) are presumably related to dynamo action in the high-latitude boundary layer downstream of the cusp." @default.
- W1545822122 created "2016-06-24" @default.
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- W1545822122 date "2006-01-01" @default.
- W1545822122 modified "2023-09-27" @default.
- W1545822122 title "IMF By and the spatio-temporal structure of the dayside aurora" @default.
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- W1545822122 doi "https://doi.org/10.1029/167gm18" @default.
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