Conditions were high altitude broken clouds and haze. Temperature 45 degrees F. Winds were calm. The moon was high in the sky, but was somewhat obscured by the haze. Mars and only a few of the brightest stars were visible. I was not able to see or hear anything out of the ordinary. I continued to observe for about 20 minutes without results. (2 aircraft were seen at high altitude over this span of time, these likely were commercial aviation. This is not uncommon at this location.)

I went back inside and saved the data from the MAD. By this time, the system had established its new baseline level. I cleared the circular buffer, saved data to disk, reset the alarm, and the system was back in its scan mode.

As I write this report, (0830 hrs. 27 April), there have been no additional alarms reported.

A preliminary look at the data reveals an interesting waveform. I am in the process of converting the data from its binary format into a BMP and JPG or GIF file. It will then be posted on this page.

---J.Brown

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28 APR, 1999. The waveform after conversion is shown below.

It should be noted that only the time frame and the relative field strength are valid. The system uses a variable baseline in its scan to minimize false alarms and because of this an absolute gauss value cannot be obtained.

The detail of the waveform is a 1 second sampling to show the pulsations present in the primary field. They ranged from 9 to 13 pps. at different points on the primary wave. Their amplitude also varied proportionate to the field strength on the primary wave.

The cause of the polarity reversal midway through is unknown, however such a waveform could be generated if a magnetic source passed by either pole of the magnetic sensor. As it passed by, each pole would first attract then repel the field of the bias magnet which is a part of the sensor.
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Additional Report of Object Sighted by Witnesses

(This report was received 18 May regarding a sighting along the power line which runs 800 feet behind my residence. The sighting ocurred about 3 miles east of my location on Chestnut Ridge, 27 April at about 0100 hrs, or approx 8 minutes prior to the activation of the MAD. Data indicates the two events may be related. What follows is an excerpt of the narrative portion of the report currently under investigation. Names are withheld at the request of witnesses.)

... Me and ( ) were parked along Skyline Drive under the power line by Pondfield. About 1 (o'clock), I saw what looked like a star over toward Elliotsville. There wasn't one there a minute before. We watched it and it looked like it was moving slowly toward us. We thought this was strange, but it was probably just a plane. We didn't pay much attention to it for a couple minutes. Next time I looked out I could see it was no plane. I could see it was a bright circle of light sort of like a doughnut. Where the hole was it was glowing a blue color. It was over the power line coming toward us from the east.

It looked like a doughnut glowing white with the blue glow in the center. As it went over the car, i heard a humming sound that sort of went through the car. ( ) said she could hear a whistle, but I didn't hear that. At the time I felt like I was falling. I lost my sense of direction and felt dizzy. ( ) said she just felt something evil was in the car but I didn't. This lasted a couple minutes or so. The light passed over the car and kept going down the mountain toward Uniontown. It disappeared behind the trees. We just sat there and talked about this for a half hour, then I took ( ) home. We wanted to report this, but didn't know who to call. ... (The narrative continues with personal info.)
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6 June, 1999 Sound duplicated under Test Conditions.

A test setup using 3 audio generators, gating control, and a mixer was configured to allow each witness to attempt to duplicate the sound they heard. I interviewed each separately, and was present to provide advise on the use of the equipment. The witnesses had control over parameters and adjusted the setup as they felt was the the most accurate representation of the sounds heard.

In summary, there were slight discrepancies in the setup, but only to the extent one would expect. One set up was 92 hertz, the other 112. Both added a pulsating sound to the signal, and both said it varied slightly in pulse rate, one said from 8 - 12 pps, the other from 9 - 16. One witness also added a high frequency component, (the whistle reported previously) at 13 khz. The witness who does not report hearing the whistle does say he has a hearing impairment, and a simple test I performed here using one of the generators confirms he cannot hear above 4.5 khz on one ear and 6 khz in the other.

A point of note, the pulse rate superimposed on the magnetic wave from the MAD unit falls within the range both witnesses reported.
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J. Brown comments,

Added data 12, June 1999, and 14 July, 1999. The absence of the high frequency component reported cannot be used conclusively since, due to the sample rate of the MAD, this is well above the abibity of the instrument to record. Sample rate is approx. 350 to 400 per second.

While circumstantial, if it is assumed the events are related, and also assuming the witness time is correct, the speed of the object and its effects is approximately 22 MPH. based on time of sighting and the maximum deviation of the MAD.

Several people who have heard the recreated sound have commented on its ability to mask other background noise and how it "deadens" any other sounds around. I can't say this is of any significance, but it is interesting.

Checks made with both the power company responsible for the transmission lines and aviation authorities have both been negative as to any activity in the 24 hour period around the event.

The investigation continues, but as of 14 July, 1999 there have been no subsequent activations, and neither witness has reported any more unusual events. As is customary in this type investigation, I re-interviewed each witness on this date. There were no significant deviations from their initial reports as given. ----- J. Brown, investigator