Confirmation of existence of the small scale field- aligned currents in middle and low latitudes and an estimate of time scale of their temporal variation

Confirmation of existence of the small scale field-aligned currents in middle and low latitudes and an estimate of time scale of their temporal variation

Toshihiko Iyemori, Kunihito Nakanishi, Tadashi Aoyama, Yoshihiro Yokoyama, Yukinobu Koyama and Hermann LührAccepted manuscript online: 19 DEC 2014 09:05AM EST | DOI: 10.1002/2014GL062555

Key Points

• Confirmation of existence of the small scale FACs in mid/low latitudes•Temporal scale of variation of the FACs is estimated by a new method•Acoustic mode of gravity waves is suggested to be the source of FACs

http://onlinelibrary.wiley.com/doi/10.1002/2014GL062555/abstract?campaign=wolacceptedarticle

Sudden pressure enhancement and tailward retreat in the near-earth plasma sheet: THEMIS observation and MHD simulation

Y. Yao, Y. Ebihara and T. TanakaAccepted manuscript online: 17 DEC 2014 05:02AM EST | DOI: 10.1002/2014JA020482

Key Points

•THEMIS observed tailward retreat of high-pressure region after substorm onset•MHD result shows that high-pressure region retreats tailward at off-equator•Convergence of plasma flow responsible to high-pressure region tailward retreat

http://onlinelibrary.wiley.com/doi/10.1002/2014JA020482/abstract?campaign=wolacceptedarticle

TWINS Stereoscopic Imaging of Multiple Peaks in the Ring Current

J. D. Perez, J. Goldstein, D. J. McComas, P. Valek, N. Buzulukova, M.-C. Fok and H. J. SingerAccepted manuscript online: 19 DEC 2014 08:59AM EST | DOI: 10.1002/2014JA020662

•Key Points

•Multiple peaks in ring current ion flux are seen by stereo TWINS ENA images.•Enhanced spatial resolution obtained from TWINS stereoscopic ENA images•THEMIS and GOES data support the ion flux obtained from TWINS ENA images.


Predominance of ECH Wave Contribution to Diffuse Aurora in Earth's Outer Magnetosphere

Xiao-Jia Zhang, Vassilis Angelopoulos, Binbin Ni and Richard M. ThorneAccepted manuscript online: 19 DEC 2014 09:06AM EST | DOI: 10.1002/2014JA020455

•Key Points

•The role of ECH waves in driving diffuse aurora is quantified globally•ECH waves are the dominant driver of diffuse aurora in the outer magnetosphere•Relative contribution of high-latitude precipitation decreases in active times


Distribution (during ECH events)

chorus

Plasmaspheric Hiss Properties: Observations from Polar

Bruce T. Tsurutani, Barbara J. Falkowski, Jolene S. Pickett, Ondrej Santolik and Gurbax S. LakhinaAccepted manuscript online: 19 DEC 2014 09:06AM EST | DOI: 10.1002/2014JA020518

•Key Points

•Hiss intensities are high during high solar wind pressure (HSWP) intervals.•During HSWP intervals and L>7, hiss is coherent or quasi-coherent.•On average hiss intensities are larger on the dayside than on the nightside.


Polar : Plasma Wave Instrument (PWI) data

B1, B2 and B3 correspond to the wave magnetic field in the maximum, intermediate and minimum variance directions. It

Comparative analysis of dayside magnetic reconnection models in global magnetosphere simulations

C. M. Komar, R. L. Fermo and P. A. CassakAccepted manuscript online: 19 DEC 2014 08:39PM EST | DOI: 10.1002/2014JA020587

•Key Points

•Compared reconnection location models with separators in global MHD simulations•Models agree fairly well with separators for southward IMF•None of the models showed strong agreement with separators for northward IMF


three-dimensional Block-Adaptive Tree Solarwind Roe-typeUpwind Scheme (BATS-R-US) code

Externally driven plasmaspheric ULF waves observed by the Van Allen Probes

Kazue Takahashi, Richard E. Denton, William Kurth, Craig Kletzing, John Wygant, John Bonnell, Lei Dai, Kyungguk Min, Charles W. Smith and Robert MacDowallAccepted manuscript online: 22 DEC 2014 05:56AM EST | DOI: 10.1002/2014JA020373

•Key Points

•The Van Allen Probes observed ULF waves in the plasmasphere•The waves were driven by ULF waves in the foreshock region•Plasmaspheric mass density is estimated from the frequency of the waves


Characteristics of the flank magnetopause: Cluster observations

S. Haaland, J. Reistad, P. Tenfjord, J. Gjerloev, L. Maes, J. DeKeyser, R. Maggiolo, C. Anekallu and N. DorvilleArticle first published online: 20 NOV 2014 | DOI: 10.1002/2014JA020539

•Key Points

•The magnetopause posesses a dawn-dusk asymmetry•The flank magnetopause is thicker than the dayside magnetopause•The magnetopause often consists of layered current sheets

http://onlinelibrary.wiley.com/doi/10.1002/2014JA020539/abstract?campaign=woletoc

Electron losses from the radiation belts caused by EMIC waves

Tobias Kersten, Richard B. Horne, Sarah A. Glauert, Nigel P. Meredith, Brian J. Fraser and Russell S. GrewArticle first published online: 5 NOV 2014 | DOI: 10.1002/2014JA020366

•Key Points

•EMIC waves cause electron loss for pitch angles <60° and energies >2 MeV•The distribution left behind in space is a pancake distribution at E > 6 MeV•EMIC waves are unlikely to set an upper energy limit on the electron flux

http://onlinelibrary.wiley.com/doi/10.1002/2014JA020366/abstract?campaign=woletocCRRESsimulation

Three-dimensional data assimilation and reanalysis of radiation belt electrons: Observations of a four-zone structure using five spacecraft and the VERB code

A. C. Kellerman, Y. Y. Shprits, D. Kondrashov, D. Subbotin, R. A. Makarevich, E. Donovan and T. NagaiArticle first published online: 4 NOV 2014 | DOI: 10.1002/2014JA020171

•Key Points

•Three dimensional reanalysis is validated using three different spacecraft sets•Reanalysis relieved a most unusual four-zone structure formed in March 1991•Flux increases during a substorm on March 26 were adiabatic above about 400 keV

http://onlinelibrary.wiley.com/doi/10.1002/2014JA020171/abstract?campaign=woletoc

CRRES, Akebono, GPSns18, GEO1989, GEO1990

Documents

Confirmation of existence of the small scale field- aligned currents in middle and low latitudes and an estimate of time scale of their temporal variation