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Using the h'-f curves of the ionospheric observations which were made every half hour or more frequently with the equipments of manual type at Fukaura 4O°36. 6'N 139° 54.1'E), Shibata_ (37° 57.0'N 139° 15.8'E) , Kokubun ji (35° 42.4'N 139° 29.3'E ) and Yamakawa (31° 12.5'N 130 37.7'E) from May 2nd through lath in the co-operative observation period for the solar eclipse on May 9th 1948, phase relations of time of variations of fEs (penetrating frequency of sporadic E) were investigated betweei each station: Then the peaks of fEs which may be a kind of clear marks of the ionosphere at the height of about 100 km, occur regularly from north to south at night, for example as shown by the peaks of f Es whose correspondence of each station may be given by the annexed numbers in Figs. 1, 2 and 3. There should be some discussions for f Es at day time. Because f Es at day time depends not only on the state of the sporadic E layer but theoretically on the absorption of the ionosphere below the sporadic E layer which may be shown roughly by the value of f min (minimum frequency in h'-f curve)", it is remarkable that fEs of all stations at day time can be compared only on the day when the diurnal variations of f min are so calm that the inequal influence of absorption for f Es at all stations cannot be noticed, while it is known that the absorption at night can be neglected always. The peaks of fEs at day time which could be compared only on May 2nd, 4th, 7th and 11thh during this period, show the propagation from south to north as in Fig. 2, although this result at day time is so few to be quite trust worthy. Thus the time interval of all the striking peaks between eachh station during this period can be shown on Fig. 4. This result at night indicates the great possibility of the southward propagation of the ionosphere at the height of about 100 km with the velocity of about 250 km per hour, i. e. about 70 m per second, considering the relative place of each station shown on Fig. 5.

On the Propagation of the Ionosphere Disturbances