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 transcript:

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, , Irkutsk, P.O. Box 291, 2 Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya, Japan, European Geosciences Union General Assembly 2011 Vienna | Austria | 03 – 08 April 2011

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

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]

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

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

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)

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

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]

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

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

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

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

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

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,  TID mostly propagates in southward direction that is typical for midlatitudes (T~2.5-3 h, ~ 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

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

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

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