GEOGRAPHIC CHARTS AND ALTITUDE PLOTS FOR SELECTED VALUES OF GEOMAGNETIC SHELL PARAMETERS B AND L,
IOWA STATE UNIV IOWA CITY
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Using the Jenson and Cain 1963 coefficients for the geomagnetic field for the epoch 1960, and McIlwains B-L Program, a grid of values of B and L were computed for the altitudes 0, 100, and 1000 km, for the latitude belt 70 degrees N to 70 degrees S in steps of 2 degrees for the latitudes and 5 degrees for the longitudes. Interpolations give the iso-contours for selected values of L and B at these three heights. These are shown in maps. A map which gives the plot of isocontours of L on the surface of the earth as seen from the North and South Poles is presented. An extension of the B-L Grid to the remaining altitudes up to 2000 km in steps of 100 km is carried out. However, a latitude interval of 5 degrees and a longitude interval of 10 degrees are adopted. The computations are also extended beyond 70 degrees latitude for some chosen longitudes necessitated by the following study. For the study of the drift of trapped particles around the earth, a useful work would be to plot iso-contours of constant B and L. The altitudes for any particular combination of B and L are plotted as a function of longitude. Maps showing such plots for the Southern and Northern Hemispheres are presented.