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2015年
1.
Takahashi, T., Nozawa, S., Tsuda,
T. T., Ogawa, Y., Saito, N., Hidemori, T., Kawahara, T. D., Hall, C., Fujiwara,
H., Matuura, N., Brekke, A., Tsutsumi, M., Wada, S., Kawabata, T., Oyama, S.,
and Fujii, R.: A case study on generation mechanisms of a sporadic sodium layer
above Tromsø (69.6° N) during a night of high auroral activity, Ann. Geophys.,
33, 941-953, doi:10.5194/angeo-33-941-2015, 2015.
2.
Hashimoto,
A., K. Shiokawa, Y. Otsuka, S. Oyama, S. Nozawa, T. Hori, M. Lester, and M. G.
Johnsen, Statistical study of auroral fragmentation into patches, J. Geophys.
Res. Space Physics, 120, doi:10.1002/2015JA021000,
2015.
3.
Miyoshi, Y., S. Oyama, S.
Saito, S. Kurita, H. Fujiwara, R. Kataoka, Y. Ebihara, C. Kletzing, G. Reeves,
O. Santolik, M. Cliverd, C. J. Rodger, E. Turunen, and F. Tsuchiya, Energetic
electron precipitation associated with pulsating aurora: EISCAT and Van Allen
Probe observations, accepted for publication in J. Geophys. Res. Space Physics,
doi:10.1002/2014JA020690, 2015.
4.
Ieda, A., S. Oyama, H.
Vanhamäki, R. Fujii, A. Nakamizo, O. Amm, T. Hori, M. Takeda, G. Ueno, A.
Yoshikawa, R. J. Redmon, W. F. Denig, Y. Kamide, and N. Nishitani, Approximate forms
of daytime ionospheric conductance, J. Geophys. Res. Space Physics, 119, pages
10397–10415. doi:10.1002/2014JA020665, 2015.
5.
Wu, Q. and S. Nozawa,
Mesospheric and thermospheric observations of the January 2010 stratospheric
warming event, J. Atmos. Solar-Terr. Phys., 123, 22-38, 2015.
6.
Fujiwara, H., S. Nozawa, Y.
Ogawa, R. Kataoka, Y. Miyoshi, H. Jin, and H. Shinagawa, Extreme ion heating in
the dayside ionosphere in response to arrival of a coronal mass ejection on
March 12, 2012, Ann. Geophys., 32, 831-839, 2014.
7.
Ogawa, Y., T. Motoba, S. C.
Buchert, I. Haaggstroem and S. Nozawa, Upper Atmosphere cooling over the past
33 years, Geophys. Res. Lett., 41, 5629?5635, doi:10.1002/2014GL060591, 2014.
8.
Takahashi, T., Nozawa, S.,
Tsutsumi, M., Hall, C., Suzuki, S., Tsuda, T. T., Kawahara, T. D., Saito, N.,
Oyama, S., Wada, S., Kawabata, T., Fujiwara, H., Brekke, A., Manson, A., Meek,
C., and Fujii, R.: A case study of gravity wave dissipation in the polar MLT
region using sodium LIDAR and radar data, Ann. Geophys., 32, 1195-1205,
doi:10.5194/angeo-32-1195-2014, 2014.
9.
Shiokawa, K., A. Hashimoto,
T. Hori, K. Sakaguchi, Y. Ogawa, E. Donovan, E. Spanswick, M. Connors, Y.
Otsuka, S. Oyama, S. Nozawa, and K. McWilliams, Auroral fragmentation into
patches, online published in J. Geophys. Res., doi: 10.1002/2014JA020050, 2014.
10.
Oyama, S., Y. Miyoshi, K.
Shiokawa, J. Kurihara, T. T. Tsuda, and B. J. Watkins, Height-dependent
ionospheric variations in the vicinity of nightside poleward expanding aurora
after substorm onset, J. Geophys. Res. Space Physics, 119,
doi:10.1002/2013JA019704, 2014.
11.
Nozawa, S., T. D. Kawahara, N. Saito, C. M. Hall, T. T. Tsuda, T.
Kawabata, S. Wada, A. Brekke, T. Takahashi, H. Fujiwara, Y. Ogawa, and R. Fujii,
Variations of the neutral temperature and sodium density between 80 and 107 km
above Tromsø during the winter of 2010-2011 by a new solid state sodium LIDAR, J.
Geophys. Res., 119, doi:10.1002/2013JA019520, 2014.
12.
Oyama, S., T. Watanabe, R.
Fujii, S. Nozawa1, and T. T. Tsuda, Estimation of the layered ionospheric
conductance using data from a multi-wavelength photometer at the European
Incoherent Scatter (EISCAT) radar site, Antarctic Record, 57(3), 339-356, 2013.
13.
Tsuda, T., S. Nozawa, T. D.
Kawahara, T. Kawabata, N. Saito, S. Wada, Y. Ogawa, S. Oyama, C. M. Hall, M.
Tsutsumi, M. K. Ejiri, S. Suzuki, T. Takahashi, T. Nakamura, Decrease in sodium
density observed during auroral particle precipitation over Tromsø, Norway, Geophys. Res.
Letter, 40, doi: 10.1002/grl.50897, 2013.
14.
Shiokawa, K., M. Mori, Y.
Otsuka, S. Oyama, S. Nozawa, S. Suzuki, and M. Connors, Observation of
nighttime medium-scale travelling ionospheric disturbances by two 630-nm
airglow imagers near the auroral zone, J. Atmos. Solar-Terr. Phys., 103,
184-194, 2013.
15.
Matuura, N., T. T. Tsuda, and
S. Nozawa, Field-aligned current loop model on formation of
sporadic metal layer, J. Geophys. Res., 118, 4628-4639,
doi:10.1002/jgra.50414, 2013.
16.
Yoshikawa, A., O. Amm, H.
Vanhamaki, and R. Fujii, Illustration of cowling channel
coupling to the shear Alfven wave, J. Geophys. Res., 118, 6405-6425,
doi:10.1002/jgra.50513, 2013.
17.
Yoshikawa, A., O. Amm, H.
Vanhamaki, A. Nakamizo, and R. Fujii, Theory of cowling
channel formation by reflection of shear Alfven waves from the auroral
ionosphere, J. Geophys. Res., 118, 6416-6425, doi:10.1002/jgra.50514, 2013.
Shiokawa, K., M. Mori, Y. Otsuka, S. Oyama, and S. Nozawa,
19.
20.
Fujii, R., O. Amm, H. Vanhamäki, A. Yoshikawa, and
A. Ieda, An application of the finite length Cowling channel model to auroral
arcs with longitudinal variations, J. Geophys. Res., 117, A11217,
doi:10.1029/2012JA017953, November, 2012.
21. Vanhamäki, H., A. Yoshikawa, O. Amm, and R. Fujii, Ionospheric Joule heating and Poynting flux in quasi-static approximation, J. Geophys. Res., 117, A0827, doi:10.1029/2012JA017841, 2012.
22.
Nozawa,
S., C. M. Hall, M. Tsutsumi, A. Brekke, Y. Ogawa, T. T. Tsuda, S. Oyama, and R.
Fujii, Mean winds, tides, and quasi-2 day waves above Bear Island, J. Atmos.
Solar-Terr. Phys., doi:10.1016:j.jastp.2012.05.002, 2012.
23.
Oyama, S., J. Kurihara,
B. J. Watkins, T. T. Tsuda, and T. Takahashi, Temporal
variations of the ion-neutral collision frequency from EISCAT observations in
the polar lower ionosphere during periods of geomagnetic disturbances, J.
Geophys. Res., 117,
A05308, doi:10.1029/2011JA017159, 2012.
24.
Fujiwara.
H., S. Nozawa, S., Maeda, Y. Ogawa, Y. Miyoshi, H. Jin, H. Shinagawa, and K.
Terada, Polar cap thermosphere and ionosphere during the solar minimum period:
EISCAT Svalbard radar observations and GCM simulations, Earth Planets Space,
64, 459-465, 2012.
25.
Gorin,
J. D., A. V., Koustov, R. A. Makarevich, J.-P St.-Maurice, and S. Nozawa,
Velocity of E-region HF echoes under strongly-driven electrojet conditions,
Ann. Geophys., 30, 235-250, doi:10.5194/angeo-30-235-2012, 2012.
26. Ogawa, Y., S. Nozawa, I. Haggstrom, S. Oyama, T. Motoba, T. Tsuda, A. Saito, Y. Miyashita, Y. Tanaka, G. Ueno, H. Miyaoka, and R. Fujii, Large-scale data processing and visualization of the European incoherent scatter (EISCAT) radar system, Journal of Space Science Informatics Japan, in press, 2011. (in Japanese)
27.
Oyama, S., and B. J. Watkins,
Generation of atmospheric gravity waves in the polar thermosphere in response
to auroral activity, Space Science Review, doi:10.1007/s11214-011-9847-z, 2011.
28.
Tsuda, T. T., S. Nozawa, T. Kawahara, T. Kawabata, N. Saito, S. Wada,
C. Hall, S. Oyama, Y. Ogawa, S. Suzuki, T. Ogawa, T. Takahashi, H. Fujiwara, R.
Fujii, N. Matuura, and A. Brekke, Fine structure of
sporadic sodium layer observed with a sodium lidar at Tromsø, Norway, Geophys.
Res. Lett., 38, L18102, doi:10.1029/2011GL048685, 2011.
29.
Yoshikawa, A., O. Amm, H. Vanhamäki, and R. Fujii, A self-consistent synthesis description of
magnetosphere-ionosphere
coupling and scale-dependent auroral process using shear Alfvén wave, J.
Geophys. Res., 116, A08218,
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30.
Yoshikawa, A., A. Nakamizo, O.
Amm, H. Vanhamäki, R. Fujii, Y. .-M. Tanaka, T. Uozumi, K. Yumoto, and S.
Ohtani, Self-consistent formulation for the evolution of
ionospheric conductances at the ionospheric E region within the M-I coupling scheme, J. Geophys. Res.,
A09223, doi:10.1029/2011JA016449,
2011.
31.
Oyama, S., A. Brekke, T. T. Tsuda, J. Kurihara, and B. J. Watkins,
Variance of the vertical ion speed measured with the EISCAT UHF radar in the
polar lower ionosphere at Tromsoe, Norway, J. Geophys. Res., 116, A00K06,
doi:10.1029/2010JA016129, 2011.
32.
Fujii, R., O. Amm, A. Yoshikawa, A. Ieda, H. Vanhamaki, The
reformulation and energy flow of the Cowling channel, J. Geophys. Res., 116,
A02305, doi:10.1029/2010JA015989, 2011.
33.
Amm, O., R. Fujii, K. Kauristie, A. Yoshikawa, A. Ieda and H.
Vanhamaki, A statistical investigation of the Cowling channel efficiency in the
auroral zone, J. Geophys. Res., 116, A02304, doi:10.1029/2010JA015988, 2011.
34.
Ogawa, Y., S. C. Buchert, I. Häggström, M. T. Rietveld, R. Fujii, S.
Nozawa, and H. Miyaoka, On the statistical
relation between ion upflow and naturally enhanced ion‐acoustic lines
observed with the EISCAT Svalbard radar, J. Geophys. Res., 116, A03313,
doi:10.1029/2010JA015827, 2011.
35.
Kosch, M., E. Mjolhus, M.
Ashrafi, M. Rietveld, T. Yeoman, S.
Nozawa, Angular dependence of pump-induced bottom- and top-side
ionospheric plasma turbulence at EISCAT, J.
Geophys. Res., 116, A03322, doi:10.1029/2010JA016014, 2011.
36.
Kosch, M., Ho-Ching Iris Yiu,
Callum Anderson, Takuo Tsuda, Yasunobu Ogawa, Satonori Nozawa, Anasuya Aruliah, Victoria Howells, Lisa Baddeley,
Ian McCrea, James Wild, Meso-scale observations of Joule heating near an
auroral arc and ion-neutral collision frequency in the polar cap E-region, J. Geophys. Res., 116, A05321,
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37.
Oyama, S., K. Shiokawa, J. Kurihara, T. T. Tsuda, S. Nozawa, Y. Ogawa,
Y. Otsuka, and B. J. Watkins, Lower-thermospheric wind fluctuations measured
with an FPI during pulsating aurora at Tromsø, Norway, Ann. Geophysicae, Ann.
Geophysicae, 28, 1847-1857, 2010.
38.
Kurihara, J., Y. Ogawa, S. Oyama, S. Nozawa ,
M. Tsutsumi , C. Hall , Y. Tomikawa , R. Fujii, Links between a stratospheric
sudden warming and thermal structures and dynamics in the high-latitude
mesosphere, lower thermosphere, and ionosphere, Geophys. Res. Lett., 37,
L13806, doi:10.1029/2010GL043643, 2010.
39.
Kurihara, J., Y. Koizumi-Kurihara, N. Iwagami, T. Suzuki, A. Kumamoto,
T. Ono, M. Nakamura, M. Ishii, A. Matsuoka, K. Ishisaka, T. Abe, and S. Nozawa,
Horizontal structure of sporadic E layer observed with a rocket-borne magnesium
ion imager, J. Geophys. Res., 115, A12318, doi:10.1029/2009JA014926, 2010.
40.
Nozawa, S., Y. Ogawa, S. Oyama, H. Fujiwara, T. Tsuda, A. Brekke, C.
M. Hall, Y. Murayama, S. Kawamura, H. Miyaoka, and R. Fujii, Tidal waves in the
polar lower thermosphere observed using the EISCAT long run data set obtained
in September 2005, J. Geophy. Res., 115, A08312, doi:10.1029/2009JA015237, 2010.
41.
Ogawa, Y., I. Haggstrom, S. C. Buchert, K. Oksavik, S. Nozawa, M.
Hirahara, A. P. van Eyken, T. Aso, and R. Fujii, On the source of the polar wind
in the polar topside ionosphere: First results from the EISCAT Svalbard radar,
Geophys. Res. Lett., 36, L24103, doi:10.1029/2009GL041501,
2009.
42.
Koizumi, Y., M. Kubota, Y. Murayama, M. Abo, M. Uchiumi, K. Igarashi,
N. Iwagami, T. Abe, and K. –I. Oyama, In situ observations of instabilities in
the mesopause region using foil chaff technique during the Waves in Airglow
Structures Experiment (WAVE) campaigns, J. Geophys. Res., 114, D20,
doi:10.1029/2009JD012237, 2009.
43.
Kurihara, J., S. Oyama, S.
Nozawa, T. T. Tsuda, R. Fujii, Y. Ogawa, H. Miyaoka, N. Iwagami, T. Abe, K.-I.
Oyama, M. Kosch, A. Aruliah, E. Griffin, and K. Kauristie, Temperature
enhancements and vertical winds in the lower thermosphere associated with
auroral heating during the Dynamics and Energetics of the Lower Thermosphere in
Aurora (DELTA) campaign, J. Geophys. Res., 114, A12, doi:10.1029/2009JA014392,
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44.
Kurihara, J., T. Abe, I.
Murata, K. Sato, and Y. Tomikawa, Development of quartz friction gauge on board
balloon and sounding rocket, Trans. JSASS Space Tech. Japan, 7 (ists26),
Pm_7-Pm_11, 2009.
45.
Fujii, R., Y. Iwata, S. Oyama, S. Nozawa, and Y. Ogawa,
Relations between proton auroras, intense electric field and ionospheric
electron density depletion, J. Geophys. Res., 114, A4, doi:10.1029/2009JA014319,
2009.
46.
Maeda, S., Y. Ogawa, K. Hosokawa, S. Nozawa, S. Oyama, T. Tsuda and A.
Brekke, Ion heating in high-speed flow channel within the duskside cell of the
polar-cap ion convection under large IMF-By condition, J. Geophys. Res., 114, A11,
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Ogawa, Y. S. C. Buchert, R.
Fujii, S. Nozawa, and A. P. van
Eyken, Characteristics of ion upflow and downflow observed with EISCAT Svalbard
radar, J. Geophys. Res., 114,
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Oyama, S., T. T. Tsuda, T. Sakanoi, Y. Obuchi, K.
Asamura, M. Hirahara, A. Yamazaki, Y. Kasaba, R. Fujii, S. Nozawa, and B. J.
Watkins, Spatial evolution of frictional heating and the predicted
thermospheric-wind effects in the vicinity of an auroral arc measured with the
Sondrestrom incoherent-scatter radar and the Reimei satellite, J. Geophys.
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Tsuda, T. T., S. Nozawa, S.
Oyama, T. Motoba, Y. Ogawa, H. Shinagawa, N. Nishitani, K. Hosokawa, N. Sato,
M. Lester, and R. Fujii, Acceleration mechanism of high-speed neutral wind
observed in the polar lower thermosphere, J. Geophys. Res., 114, A04322,
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50.
Amm, O., and R. Fujii,
Separation of Cowling channel and local closure currents in the vicinity of a
substorm breakup spiral, J. Geophys. Res., 113, A06304,
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51.
Amm, O., A. Aruliah, S. C.
Buchert, R. Fujii, J. W. Gjerloev, A. Ieda, T. Matsuo, C. Stolle, H. Vanhamaki,
and A. Yoshikawa, Towards understanding the electrodynamics of the
3-dimensional high-latitude ionosphere: present and future, Ann. Geophysicae,
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52.
Buchert, S. C., T. T. Tsuda, R.
Fujii, and S. Nozawa, The Pedersen current carried by electrons: Effects on
magnetosphere-ionosphere coupling, Ann. Geophysicae, 26, 2837-2844, 2008.
53.
Hall, C., C. Meek, A. Manson, S. Nozawa, Turbopause determination,
climatology and climatic trends, using medium frequency radars at 52degN and
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Moen, J., X. C. Qiu, H. C.
Carlson, R. Fujii, and I. W. McCrea, On the diurnal variability in F2-region
plasma density above the EISCAT Svalbard radar, Ann. Geophysicae, 25,
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55.
Moen, J., Y. Rinne, H. C.
Carlson, K. Oksavik, R. Fujii, and H. Opgenoorth, On the relationship between
thin Birkeland current arcs and reversed flow channels in the winter cusp/cleft
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Ogawa, Y., K. Seki, M.
Hirahara, K. Asamura, T. Sakanoi, S. C. Buchert, Y. Ebihara, Y. Obuchi, A.
Yamazaki, I. Sandahl, S. Nozawa,
and R. Fujii, Coordinated EISCAT Svalbard radar and Reimei satellite
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Oyama, S., B. J. Watkins, S. Maeda, H. Shinagawa,
S. Nozawa, Y. Ogawa, A. Brekke, C. Lathuillere, and W. Kofman, Generation of
the lower-thermospheric vertical wind estimated with the EISCAT KST radar at
high latitudes during periods of moderate geomagnetic disturbance, Ann.
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58.
Fujiwara, H., R. Kataoka, M.
Suzuki, S. Maeda, S. Nozawa, K. Hosokawa, H. Fukunishi, N. Sato, and M. Lester,
Electromagnetic energy deposition rate in the polar upper thermosphere derived
from the EISCAT Svalbard radar and CUTLASS Finland radar observations, Ann.
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Hall, C.M., A. Brekke, A. H.
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Trends in mesospheric turbulence at 70deg N, Atmospheric Science Lttters, 8, 80-84, 2007.
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Kosch M. J., T. Pedersen, E.
Mishin, S. Oyama, J. Hughes, A.
Senior, B. Watkins, B. Bristow, Coordinated optical and radar observations of
ionospheric pumping for a frequency pass through the second electron
gyroharmonic at HAARP, J. Geophys. Res., 112, A06325, doi:10.1029/2006JA012146,
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Kosch M. J., T. Pedersen, E.
Mishin, M. Starks, E. Gerken-Kendall, D. Sentman, S. Oyama, B. Watkins, Temporal evolution of pump beam self-focusing
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Tsuda, T. T., S. Nozawa, A.
Brekke, Y. Ogawa, T. Motoba, R. Roble, and R. Fujii, An ion drag contribution
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Amm, O., R. Nakamura, H.U.
Frey, Y. Ogawa, M. Kubyshikina, A. Balogh, and H. Reme, Substorm topology in
the ionosphere and magnetosphere during a flux rope event in the magnetotail,
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Abe, T., J. Kurihara, N.
Iwagami, S. Nozawa, Y. Ogawa, R. Fujii, H. Hayakawa, and K. –I. Oyama, Dynamics
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Griffin, E., M. Kosch, A.
Aruliah, A. Kavanagh, I. McWhirter, A. Senior, E. Ford, C. Davis, T. Abe, J.
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Kosch, P. Bernhardt, and C. J. Heinselman, Persistent enhancement of the HF
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two-dimensional simulation of thermospheric vertical winds in the vicinity of
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75.
Hall, C. M., T. Aso, M.
Tsutsumi, S. Nozawa, A.H.
Manson, and C.E. Meek, Testing the hypothesis of neutral turbulence on the deduction
of ambipolar diffusivities from meteor trail expansion, Ann. Geophisicae Letter, 23,
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Hall, C.M., T. Aso, M.
Tsutsumi, S. Nozawa, A.H. Manson
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Maeda, S., S. Nozawa,Y. Ogawa,
and H. Fujiwara, Comparative study of the high-latitude E-region ion and
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Nozawa, S., A. Brekke, S.
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