vlf ionospheric studies at ihy...
TRANSCRIPT
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 [email protected]
-Yusuf [email protected]
-Sardor Tojiev
-Bobur Turimov
-Dilshod [email protected]
-Viktoriya [email protected]
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!