Introduction Plasmagram records Observing a Whistler echo Constant ranges that correspond to multiples of the proton gyroperiod and low frequencies are the key features of the whistler-mode echoes. Unlike mid-altitude echoes and resonances, Whistler echoes occur in frequencies that allow the propagation of electromagnetic waves. Whistler echoes, however, are also believed to be caused by the excitation of the local plasma and not by propagating waves. The fact that it does occur in a propagating range, however, does make it more difficult to observe Whistler echoes. Waves from transmitters on earth, as well as, natural plasma emissions result in a large amount of noise that interferes with the observation of Whistler echoes. Given that they are a low altitude and low frequency phenomenon, Whistler echoes were mainly detected in program 38 and program 63. Both program 38 and 63 send a 3.2 ms pulse at each frequency and sweep in steps of 300 Hz from 6 to 62 and 7 to 19.9 kHz respectively. Unfortunately, programs 38 and 63 are seldom run at low altitudes and as such most Whistler echo were limited to October and November of 2001 and August of 2004. Due to the lack of frequency with which programs 38 and 63 are run at low altitudes and the high levels of noise in the whistler-mode, Whistler echoes are not as prevalent as mid-range echoes and resonances. Studies performed in the Summer of 2006 (a) Echo observed on August 15, 2004 at 21:59:55. The value of fpe is 185 kHz. (b) Echoes observed on August 15, 2004 at 22:16:38. The value of fpe is 208 kHz. (c) Echoes observed on August 15, 2004 at 22:23:55. The value of fpe is 227 kHz. ............................................................................................. Records of Whistler echoes September 2000 October 2000 November 2000 December 2000 January 2001 February 2001 March 2001 October 2001 November 2001 November 2002 August 2004 March 2005 April 2005 May 2005 June 2005 July 2005 August 2005