2.2.0 spase://VWO/DisplayData/POLAR/PWI/Polar_PWI_SFR_A_Daily_DS_GIF Polar PWI HFWR Dynamic Spectrograms 2010-12-01T01:00:00Z The Polar High Frequency Waveform Receiver (HFWR) made use of all 6 channels, 3 electric and 3 magnetic: Eu and Ev (130 m, spin-plane), Ez (14 m, spin axis) two-sphere electric dipole antennas, and 3 triaxial searchcoil magnetic antennas. The relative phase of the input signals is preserved by using phase-matched filters and the same sampling signal for each channel. 'the output waveforms are digitally sampled using a 12-bit analog-to-digital converter to give a dynamic range of 72 dB. Programmable gain amplifiers with gain steps of 15 dB are used to increase the total dynamic range to 102 dB. Each image is a plot of the power spectral density (V^2 m^-2 Hz^-1) of received signal (color scale) as a function of operating frequency (in a logarithmic scale on vertical axis) and time (horizontal axis). At the top of each plot is a title indicating the Instrument, Receiver followed by the time span for the spectrogram. Beneath the time labels on the horizontal axis are ephemeris data: position of the spacecraft in radial distance (Earth radii), geomagnetic latitude, magnetic local time, and McIlwain L-shell. The antenna gain level is indicated at the top of each plot. This data comes in snapshots of 31817 points per channel every 9.2 seconds, where the duration of each snapshot is 0.045 seconds. Reference: Gurnett, D.A. et al, The Polar plasma wave instrument, Space Science Reviews, Vol. 71, pp. 597-622, 1995.GURNETT@IOWAVE.physics.uiowa.edu spase://SMWG/Person/Donald.A.Gurnett PrincipalInvestigator spase://SMWG/Person/J.Douglas.Menietti GeneralContact Polar Plasma Wave Investigation (PWI) Data and User's Guides http://www-pw.physics.uiowa.edu/plasma-wave/istp/polar/data.html A Polar PWI page is maintained at the University of Iowa with descriptions of interpretation issues, user's guides, data availability tables, a form for creating summary plots and access to pregenerated dynamic spectrograms. en spase://SMWG/Repository/UI Online Open High Frequency Waveform Receiver (HFWR) Survery Spectrograms http://www-pw.physics.uiowa.edu/plasma-wave/istp/polar/hfwr/ Access to web pages listing GIF format plots for Polar HFWR dynamic spectrograms. en GIF None spase://SMWG/Instrument/POLAR/PWI Waves.Passive 1996-03-25T00:00:00Z 1997-09-16T17:00:00Z Earth.Magnetosphere Earth.NearSurface.Plasmasphere Earth.NearSurface.AuroralRegion Earth.NearSurface.PolarCap Heliosphere.Inner Dynamic Spectrogram Spectrogram AKR Auroral hiss Auroral Kilometric Radiation Banded emissions Chorus Continuum radiation Myriametric radiation Plasmaspheric Hiss Solar radio burst Terrestrial Kilometric Radiation TKR UHR Upper hybrid resonance SFR-A Power Spectral Density See the web page on Polar PWI Interpretation Issues http://www-pw.physics.uiowa.edu/plasma-wave/istp/polar/interpretation.html P1D V^2*m^-2*Hz^-1 PlasmaWaves Magnitude Pseudo Intensity RadioFrequency 20 25000 Hz