Artificial Modification of Polar Mesospheric Winter Echoes (PMWE) With an RF Heater: Do Charged Dust Particles Play an Active Role?

Details Artificial Modification of Polar Mesospheric Winter Echoes (PMWE) With an RF Heater: Do Charged Dust Particles Play an Active Role? Artificial Modification of Polar Mesospheric Winter Echoes (PMWE) With an RF Heater: Do Charged Dust Particles Play an Active Role?

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsa43b1585l&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SA43B-1585

Other

0305 Aerosols And Particles (0345, 4801, 4906), 2403 Active Experiments, 2461 Plasma Interactions With Dust And Aerosols (7849), 3332 Mesospheric Dynamics, 3379 Turbulence (4490)

Scientific paper

An investigation of Polar Mesospheric Winter Echoes (PMWE) has been carried out with the MST MORRO radar operating at 56 MHz. MORRO has been deployed recently at the EISCAT installation near Tromsoe in northern Norway home of two other large incoherent scatter radars and an RF heating facility. The main object of the investigation is to examine whether, and if yes how, RF heating influences PMWE. In particular, the experimental observation of the overshoot effect would indicate the presence of charged dust particles. On 11 February 2008 we measured several weak and variable PMWE layers and we used the RF heater with an on period of 20 s and off period of 100 s to modulate the radar scatter from the layers. We chose one layer, which for 44 minutes was the strongest and most stable layer, for further analysis. The signal intensity variation during an averaged on/off heater period shows the expected weakening of the signal intensity when heating is turned on followed by a significant small recovery of the signal during the on phase and a corresponding small overshoot of the signal strength of about 13-15% over the background level when heating is switched off. The recovery and overshoot are attributable to charge accumulation on the dust particles due to electron heating. The overshoot characteristic curve shows that a considerable increase in the electron temperature did take place during heating and that charged dust particles should be present, probably with radii of some nanometers.

Affiliated with

Also associated with

No associations

Rating

Artificial Modification of Polar Mesospheric Winter Echoes (PMWE) With an RF Heater: Do Charged Dust Particles Play an Active Role? does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Artificial Modification of Polar Mesospheric Winter Echoes (PMWE) With an RF Heater: Do Charged Dust Particles Play an Active Role?, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Artificial Modification of Polar Mesospheric Winter Echoes (PMWE) With an RF Heater: Do Charged Dust Particles Play an Active Role? will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1245661