PFISR Observations of UHF Polar Mesospheric Summer Echoes During the Summer of 2007

Details PFISR Observations of UHF Polar Mesospheric Summer Echoes During the Summer of 2007 PFISR Observations of UHF Polar Mesospheric Summer Echoes During the Summer of 2007

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsa51b0526v&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SA51B-0526

Physics

3332 Mesospheric Dynamics, 3379 Turbulence (4490), 6969 Remote Sensing

Scientific paper

The Poker Flat Incoherent Scatter Radar (PFISR) has been running nearly continuously throughout the summer of 2007, which permits an unprecedented, long-term study of polar mesospheric summer echoes (PMSE) at UHF. When not being run for specific user experiments, PFISR runs in its low-duty cycle International Polar Year (IPY) mode, which, through August of 2007, consisted of a single beam looking up the local magnetic field line. IPY data were examined from May through September, and tens of instances of PMSE were identified. The first event was observed on May 24, with the occurrence of PMSE becoming more common as the summer progressed. The rates of occurrence of PMSE are compared to space shuttle launch times to investigate a possible connection. Additionally, PMSE shows a strong dependence on the level of background ionization. PMSE was observed most frequently around noon when the solar zenith angle was largest. The PMSE that was observed at night was almost always accompanied by auroral ionization. A typical event persists for twenty minutes, but events as long as eighty-five minutes were observed. Spectral widths were estimated by assuming a Lorentzian spectrum and fitting an exponential to the measured autocorrelation functions. A half power half width of 20 Hz was typical. In addition, preliminary results will be presented from a lidar/radar/AIM satellite campaign held in August.

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