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Joint observation of large-scale travelling ionospheric disturbances using SuperDARN Hokkaido radar and Eastern Siberia chirp sounders network Alexey Oinats.

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Presentation on theme: "Joint observation of large-scale travelling ionospheric disturbances using SuperDARN Hokkaido radar and Eastern Siberia chirp sounders network Alexey Oinats."— Presentation transcript:

1 Joint observation of large-scale travelling ionospheric disturbances using SuperDARN Hokkaido radar and Eastern Siberia chirp sounders network Alexey Oinats 1, Konstantin Kutelev 1, Vladimir Kurkin 1, Nozomu Nishitani 2 1 Institute of Solar-Terrestrial Physics, Russia, 664033, Irkutsk, P.O. Box 291, E-mail: oinats@iszf.irk.ru 2 Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya, Japan, E-mail: nisitani@stelab.nagoya-u.ac.jp European Geosciences Union General Assembly 2011 Vienna | Austria | 03 – 08 April 2011

2 EGU GA, Vienna, April 2011 Scheme of the instruments location

3 Chirp oblique incidence sounder dataDPS-4 vertical sounder data MOF Maximal Observable Frequency Time resolution - 5 minTime resolution – 15 min foF2 Critical Frequency of F2 layer hmF2 Peak Height of F2 layer EGU GA, Vienna, April 2011 [B.W. Reinisch, D.M. Haines, K. Bibl et al. 1997] [V.A. Ivanov, V.I. Kurkin, V.E. Nosov et al., 2003]

4 EGU GA, Vienna, April 2011 Scheme of the instruments location

5 SuperDARN HF radar data Time resolution for the beam ~ 1 min EGU GA, Vienna, April 2011

6 Chirp oblique incidence soundingand vertical sounding Ground backscatter sounding at fixed frequency (SuperDARN) RTI plot for beam 0 (Hok)MOF for Magadan - Irkutsk EGU GA, Vienna, April 2011 MOF, MHz UT P, km UT Simulation for undisturbed conditions (IRI 2007)

7 Chirp oblique incidence soundingand vertical sounding Ground backscatter sounding at fixed frequency (SuperDARN) RTI plot for beam 0 (Hok)MOF for Magadan - Irkutsk Simulation for southward LSTID (160 o, 1500km, 2.5 h, 10%) EGU GA, Vienna, April 2011 MOF, MHz UT P, km UT

8 P min ground backscatter leading edge (minimal group path) SuperDARN HF radar data EGU GA, Vienna, April 2011 [T.J.T. Karhunen, T.R. Robinson, N.F. Arnold, M. Lester, 2006]

9 Observational data during March 17, 2007 EGU GA, Vienna, April 2011

10 Correlation between variations of obtained parameters during March 17, 2007 EGU GA, Vienna, April 2011

11 The absolute deviations of the minimal group path for all 16 beams of the SuperDARN Hokkaido radar on March 17, 2007 EGU GA, Vienna, April 2011 Phase difference between two detectors: Time moment for j-th detector: Discrepancy between theoretical and measured time moments Let assume Determination of the TID parameters using the SuperDARN ground scatter

12 TID (0.7UT ) EGU GA, Vienna, April 2011 InstrumentRCSNSuperDARN Time, UT23UT2UT23UT (N1)0.7UT (N2) Azimuth, deg. 240220160153 Velocity, m/s 190152190189

13 Possible source of the TID EGU GA, Vienna, April 2011 Kp=4 16.03.200717.03.200718.03.2007

14 Conclusion  Large-scale travelling ionospheric disturbance was observed at the same time by SuperDARN Hokkiado radar and by East-Siberian chirp sounders network on March 17, 2007.  TID mostly propagates in southward direction that is typical for midlatitudes (T~2.5-3 h, ~1700-2000 km,  ~190 m/s). The comparison between the two instruments shows a good agreement in estimated TID`s parameters. The possible source of the TID is an area at the boundary of the auroral oval.  The joint use of the SuperDARN Hokkaido HF radar and Russian chirp sounders network data allows to take more information about large-scale TID`s propagating in the Asia north-east. Future expansion of chirp sounders network and also installation of Russian segment SuperDARN radars will allow more possibilities in diagnostics of TIDs and identification their sources. EGU GA, Vienna, April 2011

15 Nearest future: Chirp sounders network expansion EGU GA, Vienna, April 2011

16 Nearest future: Russian segment of SuperDARN EGU GA, Vienna, April 2011

17 Thank you for attention! Institute of Solar-Terrestrial Physics, Russia Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya, Japan

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