Abstract
RECORDINGS of the magnetic micropulsations called PC 1 from two auroral zone stations, College, Alaska, and Sodankyla, Finland (64.6° N. and 63.8° N. geomagnetic, respectively), and one subauroral station, Nurmijaarvi, Finland (57.8° N.), show a marked latitude variation in mid-frequency of structured PC 1 events. Analysis of data for a 3 month period (Table 1) shows that the average frequency of structured PC 1 at Nurmijaarvi, the lower latitude station, is significantly higher than that for the auroral zone stations. Fig. 1 shows a 6 Hz PC 1 event which was recorded at Nurmijaarvi.
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HEACOCK, R., HESSLER, V., SUCKSDORFF, C. et al. Variations in PC I Frequency with Latitude. Nature 217, 153–155 (1968). https://doi.org/10.1038/217153a0
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DOI: https://doi.org/10.1038/217153a0
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