2.2.0 spase://VWO/DisplayData/POLAR/PWI/Polar_PWI_MCA_A_Daily_DS_GIF Polar PWI MCA-A Daily Dynamic Spectrograms 2010-12-01T01:00:00Z The PO-H0_PWI Multi-Channel Analyzer (MCA) CDF files provide good time resolution with relatively poor frequency resolution. An electric field measurement covers 5.6 Hz to 311 kHz in 20 channels logarithmically spaced. The magnetic field measurements cover a range from 5.6 Hz to 10 kHz in 14 channels logarithmically spaced. There are 4 frequency channels/decade with 15% bandwidth below 10 kHzand 7.5% bandwidth at 10kHz and above. The time resolution is 1.3 sec/spectra with 100 dB dynamic range. The "Electric MCA" sensor configuration is Eu, Ev, and Ez electric antennas and the magnetic loop antenna. The "Magnetic MCA" sensor configuration is the Bu, Bv, and Bz search coil antennas with the Eu electric antenna. Reference: Gurnett, D.A. et al., The Polar plasma wave instrument, Space Science Reviews, Vol 71, pp. 597-622, 1995. Each image is a daily 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 and Antenna used followed by the time span for the spectrogram. The spectrograms display Eu in the top panel and Bu in the lower panel. 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. Overlaid on each image is a trace of the electron gyrofrequency. The electron cyclotron frequencies are derived from the expression: f_ce = 0.028 kHz*B, where B is the magnitude of the ambient magnetic field measured in nT. 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 Sweep Multi-Channel Analyzer (MCA) Survery Spectrograms - MCA Electric Eu/Bu Antennas http://www-pw.physics.uiowa.edu/plasma-wave/istp/polar/sfr/electric/ Access to web pages listing GIF format plots for Polar PWI MCA dynamic spectrograms. en GIF None spase://SMWG/Instrument/POLAR/PWI Waves.Passive 1996-03-25T00:00:00Z 1997-09-16T17:00:00Z P1D 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 MCA Electric 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 5.6 311000 Hz MCA Magnetic Power Spectral Density nT^2*Hz^-1 PlasmaWaves Magnitude Pseudo Intensity RadioFrequency 5.6 10000 Hz