Although discovered more than 40 years ago [Balsley, 1964], there is still no physical mechanism that explains the occurrence of coherent echoes from altitudes around 150 kms (the so called 150-km echoes). East-West oblique beam [Fawcett, 1999] as well as wide beam imaging observations at Jicamarca, ...

Jupiter radiates electromagnetic radiation in a broad spectrum. We are concerned here with the center part, usually referred as the decimetric radiation, a relatively flat part of the spectrum going from about 39.5 MHz merging into the thermal radiation at about 4GHz. The source of this radiation ...

Doppler velocities of 150-km echoes represents the vertical ExB drift velocities at F region altitudes. 150-km observations represent and excelent mean of monitoring the electric fields at equatorial latitudes. Low power observations of 150-km echoes using the JULIA system have been carried out almost ...

In imaging work, it is desirable to have the transmitting beam width matched to the receiving one. One possibility to do this at Jicamarca, when single receiving modules are employed, is using one antenna module as the transmitting array (the whole Jicamarca array consists of 8 by 8 modules). However, ...

Presentado en CEDAR 2008 Workshop, Zermatt, Utah , 16-21 June 2008.