Production and modification of ionospheric irregularities by powerful h-f radio transmissions. Final report, 1 Aug 86-31 Jul 89
Several types of active experiments have been performed with the high power HF heater near Arecibo, Puerto Rico. The temporal behavior of suprathermal electron fluxes was studied by observing the 430 MHz radar backscatter from ionospheric Langmuir waves that were Cerenkov-emitted by the suprathermal electrons during pulse operation of the HF heater. Coded radar pulse techniques were used to study the height dependence of radar backscatter from Langmuir turbulence for both CW and pulsed HF heating. Observations with the 430 MHz radar of the power backscattered from HF induced Langmuir turbulence with a temporal resolution of 1 ms sometimes showed almost periodic short bursts of power at time intervals of 20 - 50 ms. The observational limitations on the role of strong Langmuir caviton turbulence have been pointed out and the important role of field-aligned depletions of the plasma density have been stressed in accounting for the observed height dependence of the 430 MHz radar backscatter and for nature of the observed 46.8 MHz radar backscatter. (rh)
- Research Organization:
- California Univ., San Diego, La Jolla, CA (USA). Dept. of Electrical and Computer Engineering
- OSTI ID:
- 5572341
- Report Number(s):
- AD-A-230766/8/XAB; CNN: F19628-86-K-0031
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
GENERAL PHYSICS
IONOSPHERE
PLASMA DENSITY
BACKSCATTERING
DENSITY
ELECTRONS
HEATING
HEIGHT
LANGMUIR PROBE
MODIFICATIONS
OPERATION
PLASMA
PLASMA WAVES
POWER
PRODUCTION
PUERTO RICO
PULSES
RADAR
THERMODYNAMIC PROPERTIES
TURBULENCE
DIMENSIONS
EARTH ATMOSPHERE
ELECTRIC PROBES
ELEMENTARY PARTICLES
FEDERAL REGION II
FERMIONS
GREATER ANTILLES
ISLANDS
LEPTONS
MEASURING INSTRUMENTS
NORTH AMERICA
PHYSICAL PROPERTIES
PLANETARY IONOSPHERES
PROBES
RANGE FINDERS
SCATTERING
USA
WEST INDIES
640201* - Atmospheric Physics- Auroral
Ionospheric
& Magetospheric Phenomena