TY  - JOUR
A1  - Saikin, Anthony
A1  - Jordanova, Vania K.
A1  - Zhang, J. C.
A1  - Smith, C. W.
A1  - Spence, H. E.
A1  - Larsen, B. A.
A1  - Reeves, G. D.
A1  - Torbert, R. B.
A1  - Kletzing, C. A.
A1  - Zhelayskaya, I. S.
A1  - Shprits, Yuri Y.
T1  - Comparing simulated and observed EMIC wave amplitudes using in situ Van
JF  - Journal of Atmospheric and Solar-Terrestrial Physics
N2  - We perform a statistical study calculating electromagnetic ion cyclotron (EMIC) wave amplitudes based off in situ plasma measurements taken by the Van Allen Probes’ (1.1–5.8 Re) Helium, Oxygen, Proton, Electron (HOPE) instrument. Calculated wave amplitudes are compared to EMIC waves observed by the Electric and Magnetic Field Instrument Suite and Integrated Science on board the Van Allen Probes during the same period. The survey covers a 22-month period (1 November 2012 to 31 August 2014), a full Van Allen Probe magnetic local time (MLT) precession. The linear theory proxy was used to identify EMIC wave events with plasma conditions favorable for EMIC wave excitation. Two hundred and thirty-two EMIC wave events (103 H+-band and 129 He+-band) were selected for this comparison. Nearly all events selected are observed beyond L = 4. Results show that calculated wave amplitudes exclusively using the in situ HOPE measurements produce amplitudes too low compared to the observed EMIC wave amplitudes. Hot proton anisotropy (Ahp) distributions are asymmetric in MLT within the inner (L < 7) magnetosphere with peak (minimum) Ahp, ∼0.81 to 1.00 (∼0.62), observed in the dawn (dusk), 0000 < MLT ≤ 1200 (1200 < MLT ≤ 2400), sectors. Measurements of Ahp are found to decrease in the presence of EMIC wave activity. Ahp amplification factors are determined and vary with respect to EMIC wave-band and MLT. He+-band events generally require double (quadruple) the measured Ahp for the dawn (dusk) sector to reproduce the observed EMIC wave amplitudes.
KW  - EMIC waves
KW  - Van Allen Probes
KW  - Linear theory
KW  - Wave generation
Y1  - 2018
U6  - https://doi.org/10.1016/j.jastp.2018.01.024
SN  - 1364-6826
SN  - 1879-1824
VL  - 177
SP  - 190
EP  - 201
PB  - Elsevier
CY  - Oxford
ER  - 
TY  - JOUR
A1  - Avilov, Anatoly S.
A1  - Kulygin, Alexander K.
A1  - Pietsch, Ullrich
A1  - Spence, John C. H.
A1  - Tsirelson, Vladimir G.
A1  - Zuo, Ming J.
T1  - Scanning system for high-energy electron diffractometry
Y1  - 1999
UR  - http://www3.interscience.wiley.com/journal/118518709/home?CRETRY=1&SRETRY=0
U6  - https://doi.org/10.1107/S0021889899006755
SN  - 0021-8898
ER  - 
TY  - JOUR
A1  - Tsirelson, Vladimir G.
A1  - Avilov, Anatoly S.
A1  - Lepeshov, G. G.
A1  - Kuligin, A. K.
A1  - Stahn, Jochen
A1  - Pietsch, Ullrich
A1  - Spence, J. C. H.
T1  - Quantitative Analysis of the Inner-Crystal Electrostatic Potential of several Rock-Salt-Structure Crystals Using Accurate Electron-Diffraction Data
Y1  - 2001
SN  - 1089-5647
ER  - 
TY  - JOUR
A1  - Parra, L.
A1  - Spence, C.
A1  - Sajda, P.
A1  - Ziehe, Andreas
A1  - Müller, Klaus-Robert
T1  - Unmixing hyperspectral data
Y1  - 2000
ER  - 
TY  - JOUR
A1  - Shprits, Yuri Y.
A1  - Drozdov, Alexander
A1  - Spasojevic, Maria
A1  - Kellerman, Adam C.
A1  - Usanova, Maria E.
A1  - Engebretson, Mark J.
A1  - Agapitov, Oleksiy V.
A1  - Zhelavskaya, Irina
A1  - Raita, Tero J.
A1  - Spence, Harlan E.
A1  - Baker, Daniel N.
A1  - Zhu, Hui
A1  - Aseev, Nikita
T1  - Wave-induced loss of ultra-relativistic electrons in the Van Allen radiation belts
JF  - Nature Communications
Y1  - 2016
U6  - https://doi.org/10.1038/ncomms12883
SN  - 2041-1723
VL  - 7
PB  - Nature Publ. Group
CY  - London
ER  -