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Van Allen Probe A WFR Wave Normal Angle and other Sheath-Corrected-E Polarization Parameters at 6 s cadence

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Wave Normal Analysis survey data products, derived from the Van Allen Probes A EMFISIS Wave Form Receiver Electric (E) and Magnetic Field (B) onboard averaged power spectral matrices. The survey data consists of E and B measurements from 6 orthogonal antenna at 65 logarithmically spaced frequency measurements from 2 to 11240 Hz at a cadence of 6 sec. Besides wave normal angle, some of the other products are magnetic ellipticity, degree of polarization, planarity, Poynting flux. The products are produced via PRASSADCO (Santolik, et al., 2003). A correction for antenna sheath effects has been applied to the electric field data, before being input to PRASSADCO. The correction is density-dependent, so fill values are inserted for E-dependent data where a density estimate is not available. Be aware that the spin-plane E antennas began deployment at 2012-09-13T19:44 and were not fully deployed until 2012-09-22T19:48. The spin-axis deployment began on 2012-09-24T17:59 and did not fully complete until 2012-12-07T04:41. Noise levels in the E data are increased by incomplete antenna deployment. There was a significant upgrade to the onboard calibration tables, for both E and B in Feb 2013. Prior to this, the highest survey frequency bin (11.24 kHz) used a flawed calibration value that resulted in both amplitude and phase errors. The effect is stronger for the B data. New, corrected, tables took effect at 2013-02-12T04:30:00. In Mar 2013, there was a ~2-day interval where a software issue resulted in the wrong calibration tables being used for both E and B data. These data should be used with extreme caution. The interval is 2013-03-21T06:53:00 to 2013-03-23T05:46:00.

         Santolík, O., M. Parrot, and F. Lefeuvre (2003), Singular value decomposition methods for wave propagation analysis, Radio Sci., 38, 1010, doi:10.1029/2000RS002523, 1.

Please acknowledge the Principal Investigator Craig Kletzing for use of the Data. Distribute freely, Acknowledge EMFISIS team.

Hartley, D. P., Christopher, I. W., Kletzing, C. A., Kurth, W. S., Santolik, O., Kolmasova, I., et al. (2023). Chorus wave properties from Van Allen Probes: Quantifying the impact of the sheath corrected electric field. Geophysical Research Letters, 50, e2023GL102922.

Demonstriating the use of sheath corrected e-field in poliarization analysis

Kletzing, C.A., Bortnik, J., Hospodarsky, G. et al. The Electric and Magnetic Fields Instrument Suite and Integrated Science (EMFISIS): Science, Data, and Usage Best Practices. Space Sci Rev 219, 28 (2023).

Kletzing, C.A., Kurth, W.S., Acuna, M. et al. The Electric and Magnetic Field Instrument Suite and Integrated Science (EMFISIS) on RBSP. Space Sci Rev 179, 127–181 (2013).

CC0 1.0 Universal is the Creative Commons license applicable to all publicly available NASA Heliophysics data products

Please acknowledge the Principal Investigator Craig Kletzing. Please acknowledge the Data Providers and CDAWeb when using these Data.

Sum of Two Perpendicular Electric Power Spectral Densities Using Faraday Law