Abstract A general morphology of magnetospheric electrostatic emissions at and within the geostationary orbit has been derived from the combined data sets produced by the European Space Agency Satellites GEOS1 (2–8RE) and GEOS2 (Geostationary at 6.6 RE). The occurence of emission type is related to local plasma parameters. After earlier results from GEOS1 had shown the geomagnetic equator to be the site of the most intense electron cyclotron harmonic mode (ECH) emissions at n + 1 2 f ce GEOS2 was manoevered on several occasions through the model geomagnetic equator (15° E geographic at the geostationary orbit). At low Kp the strong emissions are confined to ± 1° of the geomagnetic equator and are a factor of one hundred more powerful than waves at only 2 – 3° off the equator. Increasing Kp appears to enlarge the average latitudinal confinement (relative to the model field equator) and may result from distortions of the minimum field equator away from its quiescent location. The latitutde of the most-intense average emission moves to the south in summer and to the north in winter with increasing Kp. A comparison of GEOS1 data with GEOS2 data points to the fact that these equatorially confined emissions are limited in geomagnetic L and LT to regions where the ratio of cold upper hybrid fuH to electron gyro-frequency fce lies approximately in the range 4 – 10 corresponding to a region a few RE in radial extent just outside the plasmapause at most local times.


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    Title :

    E.S. wave morphology near the geostationary orbit


    Contributors:

    Published in:

    Publication date :

    1981-01-01


    Size :

    7 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




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