Introduction Plasmagram records Velocity-field effect Observing a fce+ resonance On a plasmagram, the resonance appears as a tall streak offset on the high frequency side of fce. They sometimes appear alongside mid-altitude echoes, where the starting frequency of an echo is the median frequency of the nearby resonance, but there is no consistent interdependency. Such resonances are different from the familiar fQn resonances and thermal mode spikes. During the months of interest, program 57 in RPI allows the identification of resonances as low as 20 kHz and as high as 320 kHz. The program sends a 3.2 ms pulse at each frequency; the spectral spacing is 1.2 kHz. Resonances have been seen at frequencies lower than 20 kHz using other programs, but the upper 320 kHz limit is safe because when fce approaches 320 kHz, the value of fpe/fce ~ 1 (IMAGE close to Earth) and allows WM signals to be dominant. (a) Resonance observed on May 07, 2004 at 16:56:24. (b) Resonance observed on May 07, 2004 at 17:01:24. (c) Resonance observed on May 07, 2004 at 17:1124. (d) Resonance observed on May 07, 2004 at 17:16:24. Distribution of gyrofrequency and plasma frequency Distribution of global parameters ............................................................................................. Records of fce+ resonances February 2002 March 2002 May 2002 June 2002 July 2002 August 2002 September 2002 December 2002 February 2004 March 2004 May 2004 June 2004 July 2004 August 2004* March 2005 April 2005 May 2005 July 2005 August 2005* Resonances at second gyroharmonic * Offers the best spectral resolution because program 38 was run.