Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsa41a1601v&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SA41A-1601
Physics
[0340] Atmospheric Composition And Structure / Middle Atmosphere: Composition And Chemistry, [2461] Ionosphere / Plasma Interactions With Dust And Aerosols, [3332] Atmospheric Processes / Mesospheric Dynamics
Scientific paper
Spectral measurements of polar mesospheric summer echoes (PMSE) have been conducted during the first two weeks of August in 2007, 2008, and 2009 with the Poker Flat Incoherent Scatter Radar (PFISR) with simultaneous lidar measurements when conditions allowed. The data from the three summers cover a variety of types of events, including PMSE both with and without Aurora and an unusually enhanced event on August 11, 2007 which has been linked to a Space Shuttle launch. The variability of the observed reflectivities and spectral widths suggests that both active and fossilized turbulence contribute to PMSE at this scale. Furthermore, when the spectral width is relatively narrow and the electron density is sufficiently high the incoherent scatter can be separated from the coherent scatter by fitting the spectra with a superposition of a wider Lorentzian model and a narrow Gaussian model. The power in the Lorentzian portion provides a direct measurement of the electron density inside the PMSE layer. Electron density measurements both inside and outside the layer rarely show any biteouts, suggesting that the fraction of the charge carried by the ice is very small.
Collins Richard L.
Heinselman Craig J.
Kelley Michael C.
Nicolls Michael J.
Varney Roger H.
No associations
LandOfFree
Polar Mesospheric Summer Echoes Observed at Poker Flat 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 Polar Mesospheric Summer Echoes Observed at Poker Flat, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Polar Mesospheric Summer Echoes Observed at Poker Flat will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1780443