***************************************************************************************** PROCEDURE : rbsp_poynting_flux PURPOSE : calculates Poynting flux. Separates into field-aligned and perp components Returns results as tplot variables. Includes values with and w/o spinaxis component REQUIRES: tplot library KEYWORDS: Bw -> tplot name of the [n,3] magnetic field waveform Ew -> tplot name of the [n,3] electric field waveform Tshort, Tlong -> short and long period of waveform to use. Bo -> (optional keyword) array of DC magnetic field directions. Use, for example, if Bw is from AC-coupled data. If not included then Bw is downsampled and used as background field method2 -> The waveform data are first downsampled to 1/Tshort to avoid the wasted computation of having to run program with data at unnecessarily high sample rate. The waveform is then run through bandpass_filter to the frequency range flow=1/Tlong...fhigh=1/Tshort method1 (default) -> uses smoothing instead of a bandpass_filter which results in a sharper freq rolloff than smoothing method. Both methods give very similar results for test chorus waves NOTES: DO NOT INPUT DATA WITH SIGNIFICANT GAPS ******************************************************************** Tested on Van Allen Probes chorus from EFW's B1 data on 2014-08-27 at ~07:42 on probe A. A is at +20 mlat and the Pflux indicates propagation away from eq with magnitude values consistent with those in Li et al., 2013 and Santolik et al., 2010 ******************************************************************** Poynting flux coord system P1mgse = Bmgse x xhat_mgse (xhat_mgse is spin axis component) P2mgse = Bmgse x P1mgse P3mgse = Bmgse The output tplot variables are: These three output variables contain a mix of spin axis and spin plane components: pflux_perp1 -> Poynting flux in perp1 direction pflux_perp2 -> Poynting flux in perp2 direction pflux_para -> Poynting flux along Bo These partial Poynting flux calculations contain only spin plane Ew. pflux_nospinaxis_perp pflux_nospinaxis_para All of the above variables projected to the ionosphere CREATED: 11/28/2012 CREATED BY: Aaron W. Breneman LAST MODIFIED: MM/DD/YYYY v1.0.0 MODIFIED BY: *****************************************************************************************