VLF ionospheric studies at IHY Tashkent site

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VLF ionospheric studies at 

IHY Tashkent site 

Dr. Yusuf Tillayev,

Prof. Bobomurat Ahmedov

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Contents

• Tashkent ionospheric research group

• 22 aug 2008 Tashkent earthquakesignature in VLF

• Solar eclipses• Future plans

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Research group

-Bobomurat [email protected]

-Yusuf [email protected]

-Sardor Tojiev

[email protected]

-Bobur Turimov

[email protected]

-Dilshod [email protected]

-Viktoriya [email protected]

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Tashkent site

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Transmitters

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Sample 1 minute spectrogram

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Tashkent earthquake, Aug 22 2008

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Earthquake simulation by equipment movement

and power disconnection

Object begin end

UPS on battery 08:07:00 08:07:04

UPS on battery 08:16:20 08:16:24

Line Receiver jump ☺ 08:26:15 08:26:17

Antenna Vert. movement 08:32:30

Antenna Vert. movement 08:40:30

Antenna Hor. movement 08:45:30

PC jump ☺ 08:54:15 08:54:17

UPS on battery 08:57:11 08:57:13

Line Receiver jump ☺ 09:01:11 09:01:13UPS on battery 09:09:13 09:09:15

UPS on battery 10:05:12 10:05:14

UPS on battery 11:05:12 11:05:15

UPS on battery 12:12:15 12:12:18

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Part 2

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Part 3

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Part 4

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Conclusion (simulation)• Sometimes ~1db increase observed when

power restored to UPS• Movement of any component of the VLF

equipment doesn’t produce amplitudegrowth

• Possible reason of the peak is the

simultaneous switching off/on thousandsof electrical equipment in the city

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Solar Eclipse Results

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Solar Eclipse

Day: 2008-08-01

Time: from ~10:00:00 to 12:00:00 UT

Credits: Wikipedia

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Solar Eclipse

Day: 2009-07-22

Time: from 00:00:00 to 03:00:00 UT

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Credits: Dr Rajesh

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Solar Eclipse

Day: 2010-01-15

Time: from 06:30:00 to 08:30:00

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Results

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Solar Flares

Classification

of X-Ray SolarFlare: A, B, C,

M, X

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Solar FlaresM5 11:25:00 UT 2010-02-12

C8 12:40:00 UT 2010-02-13

C4 2:00:00 UT 2010-02-14

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Super SID antenna(UZB1)

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PC for Super SID antenna

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Results of the Super SID antenna

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Summary• 22 Aug 2008 earthquake induced signal – no

confirmation. The same with TECmeasurements.

• Solar eclipse signatures are not observed

• Noise reduction. Maybe it is necessary toreplace to another place

• 2 SuperSID simultaneous observations canestimate the Tashkent noise level

• Maidanak astronomical observatory as apossible place for VLF and second SuperSID

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Thank you!