Survey of the frequency dependent latitudinal distribution of the fast magnetosonic wave mode from Van Allen Probes Electric and Magnetic Field Instrument and Integrated Science waveform receiver plasma wave analysis

Scott A. Boardsen; George B. Hospodarsky; Craig A. Kletzing; Mark J. Engebretson; Robert F. Pfaff; John R. Wygant; William S. Kurth; Terrance F. Averkamp; Scott R. Bounds; Jim L. Green; Sebastian De Pascuale

doi:10.1002/2015JA021844

Survey of the frequency dependent latitudinal distribution of the fast magnetosonic wave mode from Van Allen Probes Electric and Magnetic Field Instrument and Integrated Science waveform receiver plasma wave analysis

Scott A. Boardsen, George B. Hospodarsky, Craig A. Kletzing, Mark J. Engebretson, Robert F. Pfaff, John R. Wygant, William S. Kurth, Terrance F. Averkamp, Scott R. Bounds, Jim L. Green, Sebastian De Pascuale

Research output: Contribution to journal › Article › peer-review

65 Scopus citations

Abstract

We present a statistical survey of the latitudinal structure of the fast magnetosonic wave mode detected by the Van Allen Probes spanning the time interval of 21 September 2012 to 1 August 2014. We show that statistically, the latitudinal occurrence of the wave frequency (f) normalized by the local proton cyclotron frequency (f_cP) has a distinct funnel-shaped appearance in latitude about the magnetic equator similar to that found in case studies. By comparing the observed E/B ratios with the model E/B ratio, using the observed plasma density and background magnetic field magnitude as input to the model E/B ratio, we show that this mode is consistent with the extra-ordinary (whistler) mode at wave normal angles (θ_k) near 90°. Performing polarization analysis on synthetic waveforms composed from a superposition of extra-ordinary mode plane waves with θ_k randomly chosen between 87 and 90°, we show that the uncertainty in the derived wave normal is substantially broadened, with a tail extending down to θ_k of 60°, suggesting that another approach is necessary to estimate the true distribution of θ_k. We find that the histograms of the synthetically derived ellipticities and θ_k are consistent with the observations of ellipticities and θ_k derived using polarization analysis. We make estimates of the median equatorial θ_k by comparing observed and model ray tracing frequency-dependent probability occurrence with latitude and give preliminary frequency dependent estimates of the equatorial θ_k distribution around noon and 4 R_E, with the median of ~4 to 7° from 90° at f/f_cP = 2 and dropping to ~0.5° from 90° at f/f_cP = 30. The occurrence of waves in this mode peaks around noon near the equator at all radial distances, and we find that the overall intensity of these waves increases with AE∗, similar to findings of other studies.

Original language	English
Pages (from-to)	2902-2921
Number of pages	20
Journal	Journal of Geophysical Research: Space Physics
Volume	121
Issue number	4
DOIs	https://doi.org/10.1002/2015JA021844
State	Published - Apr 1 2016
Externally published	Yes

Funding

We thank Dr. K. Rönnmark at Umeå University in Sweden for providing us with the warm plasma instability code WHAMP. The EMFISIS data can be obtained from the electronic archive at the Space Physics Data Facility (http://spdf.gsfc.nasa.gov/). We acknowledge use of NASA/GSFCs Space Physics Data Facilitys OMNIWeb (or CDAWeb or ftp) service and OMNI data. The EFW-derived densities, frompotentials, are available at http://www.space.umn.edu/rbspefwdata. The shadow times of the antisunward short antenna are available at http://emfisis.physics.uiowa.edu/events/rbsp-a/SP5antinshadow/ and http://emfisis.physics.uiowa.edu/events/rbspb/SP5antinshadow/. The EMFISIS-WFR noise levels are available at http://emfisis.physics.uiowa.edu/events/rbsp-a/backgrounds/and http://emfisis.physics.uiowa.edu/events/rbsp-b/backgrounds/. At Goddard this study was supported by NASA prime contract NAS5-01072. The research at The University of Iowa was supported by JHU/APL contract 921647 under NASA Prime contract NAS5-01072.

Funders	Funder number
WHAMP
National Science Foundation	1341493
National Aeronautics and Space Administration	NAS5-01072, 921647

Keywords

fast magnetosonic waves
latitudinal distribution
statistical study
wave normal angle

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Boardsen, S. A., Hospodarsky, G. B., Kletzing, C. A., Engebretson, M. J., Pfaff, R. F., Wygant, J. R., Kurth, W. S., Averkamp, T. F., Bounds, S. R., Green, J. L., & De Pascuale, S. (2016). Survey of the frequency dependent latitudinal distribution of the fast magnetosonic wave mode from Van Allen Probes Electric and Magnetic Field Instrument and Integrated Science waveform receiver plasma wave analysis. Journal of Geophysical Research: Space Physics, 121(4), 2902-2921. https://doi.org/10.1002/2015JA021844

Boardsen, Scott A. ; Hospodarsky, George B. ; Kletzing, Craig A. et al. / Survey of the frequency dependent latitudinal distribution of the fast magnetosonic wave mode from Van Allen Probes Electric and Magnetic Field Instrument and Integrated Science waveform receiver plasma wave analysis. In: Journal of Geophysical Research: Space Physics. 2016 ; Vol. 121, No. 4. pp. 2902-2921.

@article{da01c7e3a7f5472dad3b752748869bd4,

title = "Survey of the frequency dependent latitudinal distribution of the fast magnetosonic wave mode from Van Allen Probes Electric and Magnetic Field Instrument and Integrated Science waveform receiver plasma wave analysis",

abstract = "We present a statistical survey of the latitudinal structure of the fast magnetosonic wave mode detected by the Van Allen Probes spanning the time interval of 21 September 2012 to 1 August 2014. We show that statistically, the latitudinal occurrence of the wave frequency (f) normalized by the local proton cyclotron frequency (fcP) has a distinct funnel-shaped appearance in latitude about the magnetic equator similar to that found in case studies. By comparing the observed E/B ratios with the model E/B ratio, using the observed plasma density and background magnetic field magnitude as input to the model E/B ratio, we show that this mode is consistent with the extra-ordinary (whistler) mode at wave normal angles (θk) near 90°. Performing polarization analysis on synthetic waveforms composed from a superposition of extra-ordinary mode plane waves with θk randomly chosen between 87 and 90°, we show that the uncertainty in the derived wave normal is substantially broadened, with a tail extending down to θk of 60°, suggesting that another approach is necessary to estimate the true distribution of θk. We find that the histograms of the synthetically derived ellipticities and θk are consistent with the observations of ellipticities and θk derived using polarization analysis. We make estimates of the median equatorial θk by comparing observed and model ray tracing frequency-dependent probability occurrence with latitude and give preliminary frequency dependent estimates of the equatorial θk distribution around noon and 4 RE, with the median of ~4 to 7° from 90° at f/fcP = 2 and dropping to ~0.5° from 90° at f/fcP = 30. The occurrence of waves in this mode peaks around noon near the equator at all radial distances, and we find that the overall intensity of these waves increases with AE∗, similar to findings of other studies.",

keywords = "fast magnetosonic waves, latitudinal distribution, statistical study, wave normal angle",

author = "Boardsen, {Scott A.} and Hospodarsky, {George B.} and Kletzing, {Craig A.} and Engebretson, {Mark J.} and Pfaff, {Robert F.} and Wygant, {John R.} and Kurth, {William S.} and Averkamp, {Terrance F.} and Bounds, {Scott R.} and Green, {Jim L.} and {De Pascuale}, Sebastian",

year = "2016",

month = apr,

day = "1",

doi = "10.1002/2015JA021844",

language = "English",

volume = "121",

pages = "2902--2921",

journal = "Journal of Geophysical Research: Space Physics",

issn = "2169-9380",

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Boardsen, SA, Hospodarsky, GB, Kletzing, CA, Engebretson, MJ, Pfaff, RF, Wygant, JR, Kurth, WS, Averkamp, TF, Bounds, SR, Green, JL & De Pascuale, S 2016, 'Survey of the frequency dependent latitudinal distribution of the fast magnetosonic wave mode from Van Allen Probes Electric and Magnetic Field Instrument and Integrated Science waveform receiver plasma wave analysis', Journal of Geophysical Research: Space Physics, vol. 121, no. 4, pp. 2902-2921. https://doi.org/10.1002/2015JA021844

Survey of the frequency dependent latitudinal distribution of the fast magnetosonic wave mode from Van Allen Probes Electric and Magnetic Field Instrument and Integrated Science waveform receiver plasma wave analysis. / Boardsen, Scott A.; Hospodarsky, George B.; Kletzing, Craig A. et al.
In: Journal of Geophysical Research: Space Physics, Vol. 121, No. 4, 01.04.2016, p. 2902-2921.

Research output: Contribution to journal › Article › peer-review

TY - JOUR

T1 - Survey of the frequency dependent latitudinal distribution of the fast magnetosonic wave mode from Van Allen Probes Electric and Magnetic Field Instrument and Integrated Science waveform receiver plasma wave analysis

AU - Boardsen, Scott A.

AU - Hospodarsky, George B.

AU - Kletzing, Craig A.

AU - Engebretson, Mark J.

AU - Pfaff, Robert F.

AU - Wygant, John R.

AU - Kurth, William S.

AU - Averkamp, Terrance F.

AU - Bounds, Scott R.

AU - Green, Jim L.

AU - De Pascuale, Sebastian

PY - 2016/4/1

Y1 - 2016/4/1

N2 - We present a statistical survey of the latitudinal structure of the fast magnetosonic wave mode detected by the Van Allen Probes spanning the time interval of 21 September 2012 to 1 August 2014. We show that statistically, the latitudinal occurrence of the wave frequency (f) normalized by the local proton cyclotron frequency (fcP) has a distinct funnel-shaped appearance in latitude about the magnetic equator similar to that found in case studies. By comparing the observed E/B ratios with the model E/B ratio, using the observed plasma density and background magnetic field magnitude as input to the model E/B ratio, we show that this mode is consistent with the extra-ordinary (whistler) mode at wave normal angles (θk) near 90°. Performing polarization analysis on synthetic waveforms composed from a superposition of extra-ordinary mode plane waves with θk randomly chosen between 87 and 90°, we show that the uncertainty in the derived wave normal is substantially broadened, with a tail extending down to θk of 60°, suggesting that another approach is necessary to estimate the true distribution of θk. We find that the histograms of the synthetically derived ellipticities and θk are consistent with the observations of ellipticities and θk derived using polarization analysis. We make estimates of the median equatorial θk by comparing observed and model ray tracing frequency-dependent probability occurrence with latitude and give preliminary frequency dependent estimates of the equatorial θk distribution around noon and 4 RE, with the median of ~4 to 7° from 90° at f/fcP = 2 and dropping to ~0.5° from 90° at f/fcP = 30. The occurrence of waves in this mode peaks around noon near the equator at all radial distances, and we find that the overall intensity of these waves increases with AE∗, similar to findings of other studies.

AB - We present a statistical survey of the latitudinal structure of the fast magnetosonic wave mode detected by the Van Allen Probes spanning the time interval of 21 September 2012 to 1 August 2014. We show that statistically, the latitudinal occurrence of the wave frequency (f) normalized by the local proton cyclotron frequency (fcP) has a distinct funnel-shaped appearance in latitude about the magnetic equator similar to that found in case studies. By comparing the observed E/B ratios with the model E/B ratio, using the observed plasma density and background magnetic field magnitude as input to the model E/B ratio, we show that this mode is consistent with the extra-ordinary (whistler) mode at wave normal angles (θk) near 90°. Performing polarization analysis on synthetic waveforms composed from a superposition of extra-ordinary mode plane waves with θk randomly chosen between 87 and 90°, we show that the uncertainty in the derived wave normal is substantially broadened, with a tail extending down to θk of 60°, suggesting that another approach is necessary to estimate the true distribution of θk. We find that the histograms of the synthetically derived ellipticities and θk are consistent with the observations of ellipticities and θk derived using polarization analysis. We make estimates of the median equatorial θk by comparing observed and model ray tracing frequency-dependent probability occurrence with latitude and give preliminary frequency dependent estimates of the equatorial θk distribution around noon and 4 RE, with the median of ~4 to 7° from 90° at f/fcP = 2 and dropping to ~0.5° from 90° at f/fcP = 30. The occurrence of waves in this mode peaks around noon near the equator at all radial distances, and we find that the overall intensity of these waves increases with AE∗, similar to findings of other studies.

KW - fast magnetosonic waves

KW - latitudinal distribution

KW - statistical study

KW - wave normal angle

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DO - 10.1002/2015JA021844

M3 - Article

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JO - Journal of Geophysical Research: Space Physics

JF - Journal of Geophysical Research: Space Physics

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Boardsen SA, Hospodarsky GB, Kletzing CA, Engebretson MJ, Pfaff RF, Wygant JR et al. Survey of the frequency dependent latitudinal distribution of the fast magnetosonic wave mode from Van Allen Probes Electric and Magnetic Field Instrument and Integrated Science waveform receiver plasma wave analysis. Journal of Geophysical Research: Space Physics. 2016 Apr 1;121(4):2902-2921. doi: 10.1002/2015JA021844

Survey of the frequency dependent latitudinal distribution of the fast magnetosonic wave mode from Van Allen Probes Electric and Magnetic Field Instrument and Integrated Science waveform receiver plasma wave analysis

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