| Designer | Umran Inan |
| Date | 27 December 1985 |
LANDA is designed to investigate the coupling between Landau and gyroresonance interactions. It is based on achieving a condition whereby an amplified 1+ Siple signal (echo) traverses the vicinity of the geomagnetic equator at approximately the same time as a 0+ Siple signal. To achieve this condition, and also to allow for coupling between the two interactions at locations away from the equator, the time separation between the gyro and landau pulses are varied from 1.5 to 2.5 sec, in accordance with the expected delays fro 5 kHz Siple signals [Carpenter and Miller, 1976]. The current version of the program is designed for transmissions very near the equatorial half gyrofrequency, i.e. 5 kHz.
The basic unit of the LANDA format is a 30 sec cycle. The overall time for the format is 60 seconds. The first cycle spans a frequency range between FSET-240 Hz and FSET+360 Hz. In the second iteration, the frequency range is doubled.