Digital ionosonde observations during equatorial spread F

Details Digital ionosonde observations during equatorial spread F Digital ionosonde observations during equatorial spread F

May 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....91.5539a&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 91, May 1, 1986, p. 5539-5555.

Physics

33

Digital Techniques, Equatorial Atmosphere, Ionosondes, Spread F, Gravity Waves, Peru, Radar Echoes, Space Plasmas, Time Response, Very High Frequencies

Scientific paper

Equatorial spread F data taken with a digital ionosonde/HF radar located at Huancayo, Peru, are presented and discussed. A modified phenomenology is developed which used the system's ability to do echo location. The onset of irregularities is seen to occur in the east and to move westward, while inside this large-scale structure the plasma is found to drift eastward. A very curious difference has been identified between spread F observations with the ionosonde and with the VHF radar at Jicamarca. At VHF, spread F onset often occurs when the ionosphere is rising, whereas in all five examples presented the digital ionosonde detected onset when the apparent ionosphere motion was downward. The result even held on the one night of common data taking. The effect could be instrumental, but maybe related to the considerable orographic differences in the two sites. During one night, data were obtained simultaneously with the HF radar, a rocket, and the Jicamarca VHF radar; comparisons of these data are discussed in detail. Additional evidence is presented that acoustic gravity waves play a role in the development of equatorial spread F and in the formation of detached plumes. To be self-consistent, the gravity waves must come from nearby sources such as the tropical rain forest to the east of Jicamarca.

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