Accession Number : ADA513500


Title :   Contrasting O/X-mode Heater Effects on O-Mode Sounding echo and the Generation of Magnetic Pulsations


Descriptive Note : Journal article


Corporate Author : AIR FORCE RESEARCH LAB HANSCOM AFB MA SPACE VEHICLES DIRECTORATE


Personal Author(s) : Kuo, Spencer ; Cheng, Wei-Te ; Snyder, Arnold ; Kossey, Paul ; Battis, James


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a513500.pdf


Report Date : 06 Jan 2010


Pagination or Media Count : 6


Abstract : The effects on the ionosphere of powerful O-mode and X-mode pump waves, modulated 3 minutes on and 1 minute off, were explored. The experiments were monitored using the digisonde and magnetometer located at the HAARP facility. The results show that the virtual heights of the O-mode sounding echoes shifted down/up as the O/X mode heater was turned on; the ionosphere also moved downward/upward accordingly. Enhanced spread-f was also observed in O-mode heater-on periods. Heater-induced magnetic pulsation was observed. Its intensity increased progressively in the heater on/off sequence and X-mode heater was more effective than O-mode heater in the generation of magnetic pulsation. In the last X-mode heater-on period, when the magnetic pulsation reached the highest level, pc 3 pulsations, with increasing intensity, were also observed.


Descriptors :   *IONOSPHERE , *HEATING , *MICROPULSATIONS , *MAGNETIC FIELDS , SEQUENCES , ECHOES , MAGNETOMETERS , INTENSITY , EXCITATION , MONITORING , REPRINTS , FACILITIES


Subject Categories : Atmospheric Physics


Distribution Statement : APPROVED FOR PUBLIC RELEASE