Exact(34)
A steep cusp was near the F1-layer critical frequency (foF1).
(2) A steep cusp was near the F1-layer critical frequency (foF1).
The enhancement of the F1 cusp was not seen at Kokubunji.
Comparing the ionograms at 1447 00 and 1502 00 JST, we note that the F1 cusp was evidently enhanced.
The F1 cusp was enhanced and a weak cusp appeared in the F2 region at 1530 JST.
The mid-altitude cusp was found to maintain its fine structure over periods of the order of one hour.
Similar(26)
The cusp is typically restricted and its annular attachment malpositioned, often resulting in significant aortic regurgitation.
The dayside cusp is the region where the magnetic field lines are open to interplanetary space.
The magnetospheric cusp is the first region to directly respond to IP shocks in geospace, so detailed studies focusing on the shock-related phenomena around the dayside cusp are essential in revealing the physics of its early response.
The position of the cusp is controlled by the solar wind in a similar way as the low altitude cusp.
A second, smaller cusp is present in the back crest.
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