Browsing by Author "Gonzales, C. A."
Now showing 1 - 2 of 2
Results Per Page
Sort Options
Item Restricted Doppler measurements with a digital ionosonde: Technique and comparison of results with incoherent scatter data(American Geophysical Union, 1982-09) Gonzales, C. A.; Behnke, R. A.; Woodman Pollitt, Ronald FranciscoA simple technique for measuring the amplitude and Doppler shift of vertically reflected HF echoes has been implemented for the Arecibo digital ionosonde. This technique can easily be adapted to other digital ionosondes controlled by small computers and/or microprocessors to provide the additional Doppler information. By using this technique, we have measured on-line the echo amplitude and the apparent vertical velocity of the reflecting layers. Furthermore, we have compared these data with simultaneous incoherent scatter measurements of vertical ionization drifts. The ionosonde and in oherent scatter results almost always agrree during the nighttime but do not agree during the daytime. We discuss these results.Item Restricted F region east-west drifts at Jicamarca(American Geophysical Union, 1981-01-01) Fejer, B. G.; Farley, D. T.; Gonzales, C. A.; Woodman Pollitt, Ronald Francisco; Calderon, C.F region east-west drifts have been measured at Jicamarca for almost 10 years, using incoherent scatter. The drifts are westward during the day and eastward at night. The daytime drift velocities are about 50 m/s and change very little with season or solar cycle. The evening reversal occurs at about 1600 local time throughout the solar cycle. The maximum nighttime eastward drifts are about 105 and 130 m/s during solar minimum and maximum, respectively. The daytime and nighttime drifts show very litle variation with magnetic activity. These Jicamarca incoherent scatter results (especially the reversal times) differ appreciably from results obtained using other techniques, but there appear to be fairly simple explanations for the apparent disagreements.