7/31/2019 VLF ionospheric studies at IHY Tashkent site

http://slidepdf.com/reader/full/vlf-ionospheric 1/37

VLF ionospheric studies at 

IHY Tashkent site 

Dr. Yusuf Tillayev,

Prof. Bobomurat Ahmedov

7/31/2019 VLF ionospheric studies at IHY Tashkent site

http://slidepdf.com/reader/full/vlf-ionospheric 2/37

Contents

• Tashkent ionospheric research group

• 22 aug 2008 Tashkent earthquakesignature in VLF

• Solar eclipses• Future plans

7/31/2019 VLF ionospheric studies at IHY Tashkent site

http://slidepdf.com/reader/full/vlf-ionospheric 3/37

7/31/2019 VLF ionospheric studies at IHY Tashkent site

http://slidepdf.com/reader/full/vlf-ionospheric 4/37

Research group

-Bobomurat Ahmedovahmedov@astrin.uzsci.net

-Yusuf Tillayevyusuf@astrin.uzsci.net

-Sardor Tojiev

sardor@astrin.uzsci.net

-Bobur Turimov

bobur@astrin.uzsci.net

-Dilshod Fayzullaevdilshod_f@astrin.uzsci.net

-Viktoriya Morozovamoroz_vs@yahoo.com

7/31/2019 VLF ionospheric studies at IHY Tashkent site

http://slidepdf.com/reader/full/vlf-ionospheric 5/37

Tashkent site

7/31/2019 VLF ionospheric studies at IHY Tashkent site

http://slidepdf.com/reader/full/vlf-ionospheric 6/37

Transmitters

7/31/2019 VLF ionospheric studies at IHY Tashkent site

http://slidepdf.com/reader/full/vlf-ionospheric 7/37

Sample 1 minute spectrogram

7/31/2019 VLF ionospheric studies at IHY Tashkent site

http://slidepdf.com/reader/full/vlf-ionospheric 8/37

Tashkent earthquake, Aug 22 2008

7/31/2019 VLF ionospheric studies at IHY Tashkent site

http://slidepdf.com/reader/full/vlf-ionospheric 9/37

7/31/2019 VLF ionospheric studies at IHY Tashkent site

http://slidepdf.com/reader/full/vlf-ionospheric 10/37

7/31/2019 VLF ionospheric studies at IHY Tashkent site

http://slidepdf.com/reader/full/vlf-ionospheric 11/37

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

7/31/2019 VLF ionospheric studies at IHY Tashkent site

http://slidepdf.com/reader/full/vlf-ionospheric 12/37

7/31/2019 VLF ionospheric studies at IHY Tashkent site

http://slidepdf.com/reader/full/vlf-ionospheric 13/37

Part 2

7/31/2019 VLF ionospheric studies at IHY Tashkent site

http://slidepdf.com/reader/full/vlf-ionospheric 14/37

Part 3

7/31/2019 VLF ionospheric studies at IHY Tashkent site

http://slidepdf.com/reader/full/vlf-ionospheric 15/37

Part 4

7/31/2019 VLF ionospheric studies at IHY Tashkent site

http://slidepdf.com/reader/full/vlf-ionospheric 16/37

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

7/31/2019 VLF ionospheric studies at IHY Tashkent site

http://slidepdf.com/reader/full/vlf-ionospheric 17/37

Solar Eclipse Results

7/31/2019 VLF ionospheric studies at IHY Tashkent site

http://slidepdf.com/reader/full/vlf-ionospheric 18/37

Solar Eclipse

Day: 2008-08-01

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

Credits: Wikipedia

7/31/2019 VLF ionospheric studies at IHY Tashkent site

http://slidepdf.com/reader/full/vlf-ionospheric 19/37

7/31/2019 VLF ionospheric studies at IHY Tashkent site

http://slidepdf.com/reader/full/vlf-ionospheric 20/37

Solar Eclipse

Day: 2009-07-22

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

7/31/2019 VLF ionospheric studies at IHY Tashkent site

http://slidepdf.com/reader/full/vlf-ionospheric 21/37

Credits: Dr Rajesh

7/31/2019 VLF ionospheric studies at IHY Tashkent site

http://slidepdf.com/reader/full/vlf-ionospheric 22/37

7/31/2019 VLF ionospheric studies at IHY Tashkent site

http://slidepdf.com/reader/full/vlf-ionospheric 23/37

7/31/2019 VLF ionospheric studies at IHY Tashkent site

http://slidepdf.com/reader/full/vlf-ionospheric 24/37

7/31/2019 VLF ionospheric studies at IHY Tashkent site

http://slidepdf.com/reader/full/vlf-ionospheric 25/37

Solar Eclipse

Day: 2010-01-15

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

7/31/2019 VLF ionospheric studies at IHY Tashkent site

http://slidepdf.com/reader/full/vlf-ionospheric 26/37

Results

7/31/2019 VLF ionospheric studies at IHY Tashkent site

http://slidepdf.com/reader/full/vlf-ionospheric 27/37

Solar Flares

Classification

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

M, X

7/31/2019 VLF ionospheric studies at IHY Tashkent site

http://slidepdf.com/reader/full/vlf-ionospheric 28/37

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

7/31/2019 VLF ionospheric studies at IHY Tashkent site

http://slidepdf.com/reader/full/vlf-ionospheric 29/37

7/31/2019 VLF ionospheric studies at IHY Tashkent site

http://slidepdf.com/reader/full/vlf-ionospheric 30/37

7/31/2019 VLF ionospheric studies at IHY Tashkent site

http://slidepdf.com/reader/full/vlf-ionospheric 31/37

7/31/2019 VLF ionospheric studies at IHY Tashkent site

http://slidepdf.com/reader/full/vlf-ionospheric 32/37

7/31/2019 VLF ionospheric studies at IHY Tashkent site

http://slidepdf.com/reader/full/vlf-ionospheric 33/37

Super SID antenna(UZB1)

7/31/2019 VLF ionospheric studies at IHY Tashkent site

http://slidepdf.com/reader/full/vlf-ionospheric 34/37

PC for Super SID antenna

7/31/2019 VLF ionospheric studies at IHY Tashkent site

http://slidepdf.com/reader/full/vlf-ionospheric 35/37

Results of the Super SID antenna

7/31/2019 VLF ionospheric studies at IHY Tashkent site

http://slidepdf.com/reader/full/vlf-ionospheric 36/37

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

7/31/2019 VLF ionospheric studies at IHY Tashkent site

http://slidepdf.com/reader/full/vlf-ionospheric 37/37

Thank you!