We report initial results from a montecarlo simulation which attempts
to model the diurnal and seasonal variability of the meteor rate
detected by high power and large aperture (HPLA) radars.
The simulation assumes that the detected particles originate from a
radiant distribution concentrated around the Earth's apex as recently
shown by interferometric radar observations perfomed with the
Jicamarca 50 MHz radar in Peru. We compare the modeled daily rates at
different seasons with observed meteor counts using the 430 MHz
Arecibo radar in Puerto Rico and found excellent agreement.
We also compared the model with observations at high northern
latitudes from the 1.2 GHz Sondrestrom radar in Greenland, finding
also excellent agreement. Based on the agreement found we predict the
global and yearly input of the micrometeor flux in the atmosphere.
The results of the simulation suggest that particles which enter the
atmosphere at low elevations (lower or equal than 5 degrees) will not
penetrate deep into the mesosphere/lower thermosphere (MLT)
atmospheric region. The probable cause for this effect is that these
particles will rich high temperatures at higher altitudes ablating
before they reach ~100 km.