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Doppler sounding of the Ionosphere - latest Doppler shift spectrograms by IAP
Doppler monitoring of OKXX beacons on 4649.5 kHz by OK1DUB

Doppler monitoring of OK0EU beacons on 3594.5 kHz
in Praha Ruzyne (JO70DC) - spectrograms were hourly updated

Doppler monitoring was in operation since November 2006 until September 2015

Upload time of files is LOC (local CET/CEST)          Timescale on spectrograms is UTC (nearly UT)

Last update: 21.09.2015 / 09:36 LOC
1234 spectrograms in current folder















Actual view
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78 hours back 84 hours back 90 hours back 96 hours back
102 hours back 108 hours back 114 hours back 120 hours back
126 hours back 132 hours back 138 hours back 144 hours back
150 hours back 156 hours back 162 hours back 168 hours back


Archive data
(files marked by italic font are shifted in upload time)
21.09.2015 - 09 08 07 06 05 04 03 02 01 00
20.09.2015 - H24 - 23 22 21 20 19 18 17 16 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
19.09.2015 - H24 - 23 22 21 20 19 18 17 16 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
18.09.2015 - H24 - 23 22 21 20 19 18 17 16 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
17.09.2015 - H24 - 23 22 21 20 19 18 17 16 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
16.09.2015 - H24 - 23 22 21 20 19 18 17 16 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
15.09.2015 - H24 - 23 22 21 20 19 18 17 16 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
14.09.2015 - H24 - 23 22 21 20 19 18 17 16 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
All data (51 days back) Gallery

2015   2014   2013   2012   2011   2010   2009   2008   2007   2006

Ionogram


Alternative views
Last 7 x 24 hours - short page
Last 6 hours - short page
Last 6 hours - JPEG 1620 x 800 pix
Last 24 hours - JPEG 984 x 360 pix
Last 24 hours - JPEG 650 x 240 pix
Last 24 hours - JPEG 320 x 096 pix
Last 24 hours - JPEG 128 x 128 pix
Last 6 hours - JPEG 138 x 148 pix
Last 24 hours - all JPEG pics


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Created and operated by https://ok1dub.cz

Special thanks to OK1ALE for keeping this service after 01.10.2014





Previous descriptions of spectrograms below



Antennas used
Fifty meters long wire antenna above hangar roof
(until 17.12.2012 / since 25.06.2013)
Ten meters long wire substitute antenna
(since 21.12.2012 / until 24.06.2013)

Hardware used
Transceiver Icom IC-706 as the HF receiver
PC Dell OptiPlex GX620, OS Windows XP
(New PC and network since 29.03.2012)

Software used
Spectrum analysis realized by Spectrum Lab (config file)
Spectrogram files uploading realized by Auto Ftp
Time synchronization realized by AboutTime
(until 28.03.2012)

Related links
Screenshots of OK0EU by Alan, G4ZFQ
Sledování majáku OK0EU - článek pro OK QRP INFO
Observations of OK0EU infrasound Doppler phenomena
Current distribution of transmitters and receivers in the Czech Republic
A new Doppler type system for measuring the ionospheric effects
Description of the multi-point Doppler sounding system
Physics of the Ionosphere

Disclaimer
Service will be enhanced depending on personal possibilities of creator
Service can be interrupted at any time due to technical reasons
For scientific, educational and hobby purposes only

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Statistics since 16.11.2006

Miroslav Najman
e-mail: mirek@ok1dub.cz