![]() Higher frequency loop is probably reflected equatorward of Sounder path between sounder positions Band C. Of the sounder from the less dense wall whichintersects the The lower frequency loop is reflect ed equatorward ![]() Near the 6 x 10’ and 6 x lo4 electron density levels, respectively. The lower and higher frequency loops are reflected from Notice that the extraordinary cutoff is at a much lower frequency on ionogramĬ, due to the lower electron density at the sounder at pointĬ. On ionogram C there are two loops, whose nosefrequenciesĪre about 0.72 MHz and 1.31 MHz. Steep side of the depression than at position A the noseįrequency is higher on ionogram B than on ionogram A. Since the sounder at position B is further away from the Ray would be reflected equatorward of the sounder (pointī). ![]() Occurs near the 8 x lo3 electron density contour. On ionogramī the nose frequency is 1.18 MHz so that the reflection Just equatorward of the sounder at point A. Which tend to merge at the higher frequencies.On ionogramĪ the nose of the loop is at about 1.03 MHz. Of the loops shows the nose frequency and two branches Ionogram C, could be an example of this). ![]() Of no returned oblique echoes (the two loops in Fig. Possible to get severalloops separated by frequency regions Thus, for a variable spacing in the vertical contours it is Merge or the effective nose frequency may become so greatĪs to exclude oblique echoes from returning to the satellite. If the separation of the contours becomessufficiently great, the branches mayeven The reason for this is again that theĭistance between the sounder and wall increases with increasing sounding frequency. Is to bring the two branches of the loop closer together with Increases with increasing frequency and waves encounterĪdditional retardation in crossing the vertical contours as ![]()
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