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The last ELFO alarms from the station.

The Extreme Low Frequency Observatory operate in the frequency range from (close to) 0 Hz to 15360 Hz. The ELFO is located in the AMS in Hessdalen. All strong electromagnetical (EM) signals are detected. The threshold level can be adjusted. Each day, the previous day and night detected EM signals, is converted to pictures, and transmittet to this page. More details can be found in the studentreport, and at the bottom of this page.


Choose a folder for a specific day:

Year: 2007

Elfo - 19.06.2007Elfo - 18.06.2007Elfo - 17.06.2007Elfo - 16.06.2007Elfo - 15.06.2007
Elfo - 14.06.2007Elfo - 13.06.2007Elfo - 12.06.2007Elfo - 11.06.2007Elfo - 10.06.2007
Elfo - 0hes21.06.2007Elfo - 0hes20.06.2007Elfo - 0hes19.06.2007Elfo - 09.06.2007Elfo - 08.06.2007
Elfo - 07.06.2007Elfo - 06.06.2007Elfo - 05.06.2007Elfo - 04.06.2007Elfo - 03.06.2007
Elfo - 02.06.2007Elfo - 01.06.2007Elfo - 31.05.2007Elfo - 30.05.2007Elfo - 29.05.2007
Elfo - 28.05.2007Elfo - 27.05.2007Elfo - 26.05.2007Elfo - 25.05.2007Elfo - 24.05.2007
Elfo - 23.05.2007Elfo - 22.05.2007Elfo - 21.05.2007Elfo - 20.05.2007Elfo - 19.05.2007
Elfo - 18.05.2007Elfo - 17.05.2007Elfo - 16.05.2007Elfo - 15.05.2007Elfo - 14.05.2007
Elfo - 09.05.2007Elfo - 08.05.2007Elfo - 05.05.2007Elfo - 04.05.2007Elfo - 03.05.2007
Elfo - 02.05.2007Elfo - 01.05.2007Elfo - 30.04.2007Elfo - 29.04.2007Elfo - 28.04.2007
Elfo - 27.04.2007Elfo - 26.04.2007Elfo - 25.04.2007Elfo - 24.04.2007Elfo - 23.04.2007
Elfo - 22.04.2007Elfo - 21.04.2007Elfo - 20.04.2007Elfo - 19.04.2007Elfo - 18.04.2007
Elfo - 17.04.2007Elfo - 16.04.2007Elfo - 15.04.2007Elfo - 14.04.2007Elfo - 13.04.2007
Elfo - 12.04.2007Elfo - 11.04.2007Elfo - 10.04.2007Elfo - 09.04.2007Elfo - 08.04.2007
Elfo - 07.04.2007Elfo - 05.04.2007Elfo - 04.04.2007Elfo - 03.04.2007Elfo - 02.04.2007
Elfo - 01.04.2007Elfo - 31.03.2007Elfo - 30.03.2007Elfo - 29.03.2007Elfo - 28.03.2007
Elfo - 27.03.2007Elfo - 26.03.2007Elfo - 25.03.2007Elfo - 24.03.2007Elfo - 23.03.2007
Elfo - 22.03.2007Elfo - 21.03.2007Elfo - 20.03.2007Elfo - 19.03.2007Elfo - 18.03.2007
Elfo - 17.03.2007Elfo - 15.03.2007Elfo - 14.03.2007Elfo - 13.03.2007Elfo - 12.03.2007
Elfo - 10.03.2007Elfo - 07.03.2007Elfo - 06.03.2007Elfo - 05.03.2007Elfo - 03.03.2007
Elfo - 02.03.2007Elfo - 01.03.2007Elfo - 27.02.2007Elfo - 26.02.2007Elfo - 25.02.2007
Elfo - 24.02.2007Elfo - 23.02.2007Elfo - 22.02.2007Elfo - 21.02.2007Elfo - 19.02.2007
Elfo - 18.02.2007Elfo - 17.02.2007Elfo - 16.02.2007Elfo - 15.02.2007Elfo - 14.02.2007
Elfo - 13.02.2007Elfo - 12.02.2007Elfo - 11.02.2007Elfo - 10.02.2007Elfo - 09.02.2007
Elfo - 08.02.2007Elfo - 07.02.2007Elfo - 09.01.2007Elfo - 08.01.2007Elfo - 06.01.2007
Elfo - 05.01.2007Elfo - 04.01.2007Elfo - 03.01.2007Elfo - 02.01.2007Elfo - 01.01.2007

Year: 2006

Elfo - 31.12.2006Elfo - 30.12.2006Elfo - 29.12.2006Elfo - 28.12.2006Elfo - 27.12.2006
Elfo - 26.12.2006Elfo - 25.12.2006Elfo - 24.12.2006Elfo - 23.12.2006Elfo - 22.12.2006
Elfo - 21.12.2006Elfo - 20.12.2006Elfo - 19.12.2006Elfo - 18.12.2006Elfo - 17.12.2006
Elfo - 16.12.2006Elfo - 15.12.2006Elfo - 14.12.2006Elfo - 13.12.2006Elfo - 12.12.2006
Elfo - 11.12.2006Elfo - 10.12.2006Elfo - 09.12.2006Elfo - 08.12.2006Elfo - 07.12.2006
Elfo - 06.12.2006Elfo - 05.12.2006Elfo - 04.12.2006Elfo - 03.12.2006Elfo - 02.12.2006
Elfo - 01.12.2006Elfo - 30.11.2006Elfo - 29.11.2006Elfo - 28.11.2006Elfo - 27.11.2006
Elfo - 26.11.2006Elfo - 25.11.2006Elfo - 24.11.2006Elfo - 23.11.2006Elfo - 22.11.2006
Elfo - 16.11.2006Elfo - 15.11.2006Elfo - 13.11.2006Elfo - 06.11.2006Elfo - 05.11.2006
Elfo - 04.11.2006Elfo - 03.11.2006Elfo - 02.11.2006Elfo - 01.11.2006Elfo - 31.10.2006
Elfo - 30.10.2006Elfo - 29.10.2006Elfo - 28.10.2006Elfo - 27.10.2006Elfo - 26.10.2006
Elfo - 25.10.2006Elfo - 24.10.2006Elfo - 23.10.2006Elfo - 22.10.2006Elfo - 21.10.2006
Elfo - 20.10.2006Elfo - 12.10.2006Elfo - 22.09.2006


Thanks to Jader Monari for this info:
The file is stored only when some signal in spectra domain within 0 up to 15360Hz hits a particular threshold set remotely by hands (0dBm). The average of the receiver+atmospheric spectral noise in Hessdalen is -40dBm/Hz. In general, the signals that hit the threshold are strong statics or man-made.

The files are represented in JTFA (Join Time Frequency Analysis) format. The colours represent the strength or intensity of the signal. The dynamic range is from -80dBm up to 10dBm. These amplitudes are compared with 16581375 different numbers (representing all possible colours in RGB using hex values.). Each one of those values is spitted into three different values representing the RED component, the GREEN component and the BLUE component. The x axis is the frequency from 0 up to 15360Hz. The resolution is 15Hz The y axis is the time in seconds.

You may read more about natural low frequency EM signals at http://www.vlf.it/regularsig/regularsignals.htm and http://www.vlf.it/nrs/nrs.htm


Copyright ©2000 Project Hessdalen. Webmaster : Erling Strand.
All comments or questions about this web shall be send to Webmaster
Last update 13 April 2007 14:18:26.

nor-flagg