Power spectrum analysis of ionospheric fluctuations with the Murchison Widefield Array

Shyeh Tjing Loi; Cathryn M. Trott; Tara Murphy; Iver H. Cairns; Martin Bell; Natasha Hurley-Walker; John Morgan; Emil Lenc; A. R. Offringa; L. Feng; P. J. Hancock; D. L. Kaplan; N. Kudryavtseva; G. Bernardi; Judd Bowman; F. Briggs; R. J. Cappallo; B. E. Corey; A. A. Deshpande; D. Emrich; B. M. Gaensler; R. Goeke; L. J. Greenhill; B. J. Hazelton; M. Johnston-Hollitt; J. C. Kasper; E. Kratzenberg; C. J. Lonsdale; M. J. Lynch; S. R. McWhirter; D. A. Mitchell; M. F. Morales; E. Morgan; D. Oberoi; S. M. Ord; T. Prabu; A. E E Rogers; A. Roshi; N. Udaya Shankar; K. S. Srivani; R. Subrahmanyan; S. J. Tingay; M. Waterson; R. B. Wayth; R. L. Webster; A. R. Whitney; A. Williams; C. L. Williams

doi:10.1002/2015RS005711

Power spectrum analysis of ionospheric fluctuations with the Murchison Widefield Array

Shyeh Tjing Loi, Cathryn M. Trott, Tara Murphy, Iver H. Cairns, Martin Bell, Natasha Hurley-Walker, John Morgan, Emil Lenc, A. R. Offringa, L. Feng, P. J. Hancock, D. L. Kaplan, N. Kudryavtseva, G. Bernardi, Judd Bowman, F. Briggs, R. J. Cappallo, B. E. Corey, A. A. Deshpande, D. EmrichB. M. Gaensler, R. Goeke, L. J. Greenhill, B. J. Hazelton, M. Johnston-Hollitt, J. C. Kasper, E. Kratzenberg, C. J. Lonsdale, M. J. Lynch, S. R. McWhirter, D. A. Mitchell, M. F. Morales, E. Morgan, D. Oberoi, S. M. Ord, T. Prabu, A. E E Rogers, A. Roshi, N. Udaya Shankar, K. S. Srivani, R. Subrahmanyan, S. J. Tingay, M. Waterson, R. B. Wayth, R. L. Webster, A. R. Whitney, A. Williams, C. L. Williams

Earth and Space Exploration, School of (SESE)

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

37 Scopus citations

Abstract

Low-frequency, wide field-of-view (FOV) radio telescopes such as the Murchison Widefield Array (MWA) enable the ionosphere to be sampled at high spatial completeness. We present the results of the first power spectrum analysis of ionospheric fluctuations in MWA data, where we examined the position offsets of radio sources appearing in two data sets. The refractive shifts in the positions of celestial sources are proportional to spatial gradients in the electron column density transverse to the line of sight. These can be used to probe plasma structures and waves in the ionosphere. The regional (10-100 km) scales probed by the MWA, determined by the size of its FOV and the spatial density of radio sources (typically thousands in a single FOV), complement the global (100-1000 km) scales of GPS studies and local (0.01-1 km) scales of radar scattering measurements. Our data exhibit a range of complex structures and waves. Some fluctuations have the characteristics of traveling ionospheric disturbances, while others take the form of narrow, slowly drifting bands aligned along the Earth's magnetic field.

Original language	English (US)
Pages (from-to)	574-597
Number of pages	24
Journal	Radio Science
Volume	50
Issue number	7
DOIs	https://doi.org/10.1002/2015RS005711
State	Published - Jul 1 2015

Keywords

Murchison Widefield Array
ionosphere
power spectrum

ASJC Scopus subject areas

Condensed Matter Physics
General Earth and Planetary Sciences
Electrical and Electronic Engineering

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10.1002/2015RS005711

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Loi, S. T., Trott, C. M., Murphy, T., Cairns, I. H., Bell, M., Hurley-Walker, N., Morgan, J., Lenc, E., Offringa, A. R., Feng, L., Hancock, P. J., Kaplan, D. L., Kudryavtseva, N., Bernardi, G., Bowman, J., Briggs, F., Cappallo, R. J., Corey, B. E., Deshpande, A. A., ... Williams, C. L. (2015). Power spectrum analysis of ionospheric fluctuations with the Murchison Widefield Array. Radio Science, 50(7), 574-597. https://doi.org/10.1002/2015RS005711

Loi, ST, Trott, CM, Murphy, T, Cairns, IH, Bell, M, Hurley-Walker, N, Morgan, J, Lenc, E, Offringa, AR, Feng, L, Hancock, PJ, Kaplan, DL, Kudryavtseva, N, Bernardi, G, Bowman, J, Briggs, F, Cappallo, RJ, Corey, BE, Deshpande, AA, Emrich, D, Gaensler, BM, Goeke, R, Greenhill, LJ, Hazelton, BJ, Johnston-Hollitt, M, Kasper, JC, Kratzenberg, E, Lonsdale, CJ, Lynch, MJ, McWhirter, SR, Mitchell, DA, Morales, MF, Morgan, E, Oberoi, D, Ord, SM, Prabu, T, Rogers, AEE, Roshi, A, Shankar, NU, Srivani, KS, Subrahmanyan, R, Tingay, SJ, Waterson, M, Wayth, RB, Webster, RL, Whitney, AR, Williams, A & Williams, CL 2015, 'Power spectrum analysis of ionospheric fluctuations with the Murchison Widefield Array', Radio Science, vol. 50, no. 7, pp. 574-597. https://doi.org/10.1002/2015RS005711

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title = "Power spectrum analysis of ionospheric fluctuations with the Murchison Widefield Array",

abstract = "Low-frequency, wide field-of-view (FOV) radio telescopes such as the Murchison Widefield Array (MWA) enable the ionosphere to be sampled at high spatial completeness. We present the results of the first power spectrum analysis of ionospheric fluctuations in MWA data, where we examined the position offsets of radio sources appearing in two data sets. The refractive shifts in the positions of celestial sources are proportional to spatial gradients in the electron column density transverse to the line of sight. These can be used to probe plasma structures and waves in the ionosphere. The regional (10-100 km) scales probed by the MWA, determined by the size of its FOV and the spatial density of radio sources (typically thousands in a single FOV), complement the global (100-1000 km) scales of GPS studies and local (0.01-1 km) scales of radar scattering measurements. Our data exhibit a range of complex structures and waves. Some fluctuations have the characteristics of traveling ionospheric disturbances, while others take the form of narrow, slowly drifting bands aligned along the Earth's magnetic field.",

keywords = "Murchison Widefield Array, ionosphere, power spectrum",

author = "Loi, {Shyeh Tjing} and Trott, {Cathryn M.} and Tara Murphy and Cairns, {Iver H.} and Martin Bell and Natasha Hurley-Walker and John Morgan and Emil Lenc and Offringa, {A. R.} and L. Feng and Hancock, {P. J.} and Kaplan, {D. L.} and N. Kudryavtseva and G. Bernardi and Judd Bowman and F. Briggs and Cappallo, {R. J.} and Corey, {B. E.} and Deshpande, {A. A.} and D. Emrich and Gaensler, {B. M.} and R. Goeke and Greenhill, {L. J.} and Hazelton, {B. J.} and M. Johnston-Hollitt and Kasper, {J. C.} and E. Kratzenberg and Lonsdale, {C. J.} and Lynch, {M. J.} and McWhirter, {S. R.} and Mitchell, {D. A.} and Morales, {M. F.} and E. Morgan and D. Oberoi and Ord, {S. M.} and T. Prabu and Rogers, {A. E E} and A. Roshi and Shankar, {N. Udaya} and Srivani, {K. S.} and R. Subrahmanyan and Tingay, {S. J.} and M. Waterson and Wayth, {R. B.} and Webster, {R. L.} and Whitney, {A. R.} and A. Williams and Williams, {C. L.}",

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doi = "10.1002/2015RS005711",

language = "English (US)",

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T1 - Power spectrum analysis of ionospheric fluctuations with the Murchison Widefield Array

AU - Loi, Shyeh Tjing

AU - Trott, Cathryn M.

AU - Murphy, Tara

AU - Cairns, Iver H.

AU - Bell, Martin

AU - Hurley-Walker, Natasha

AU - Morgan, John

AU - Lenc, Emil

AU - Offringa, A. R.

AU - Feng, L.

AU - Hancock, P. J.

AU - Kaplan, D. L.

AU - Kudryavtseva, N.

AU - Bernardi, G.

AU - Bowman, Judd

AU - Briggs, F.

AU - Cappallo, R. J.

AU - Corey, B. E.

AU - Deshpande, A. A.

AU - Emrich, D.

AU - Gaensler, B. M.

AU - Goeke, R.

AU - Greenhill, L. J.

AU - Hazelton, B. J.

AU - Johnston-Hollitt, M.

AU - Kasper, J. C.

AU - Kratzenberg, E.

AU - Lonsdale, C. J.

AU - Lynch, M. J.

AU - McWhirter, S. R.

AU - Mitchell, D. A.

AU - Morales, M. F.

AU - Morgan, E.

AU - Oberoi, D.

AU - Ord, S. M.

AU - Prabu, T.

AU - Rogers, A. E E

AU - Roshi, A.

AU - Shankar, N. Udaya

AU - Srivani, K. S.

AU - Subrahmanyan, R.

AU - Tingay, S. J.

AU - Waterson, M.

AU - Wayth, R. B.

AU - Webster, R. L.

AU - Whitney, A. R.

AU - Williams, A.

AU - Williams, C. L.

PY - 2015/7/1

Y1 - 2015/7/1

N2 - Low-frequency, wide field-of-view (FOV) radio telescopes such as the Murchison Widefield Array (MWA) enable the ionosphere to be sampled at high spatial completeness. We present the results of the first power spectrum analysis of ionospheric fluctuations in MWA data, where we examined the position offsets of radio sources appearing in two data sets. The refractive shifts in the positions of celestial sources are proportional to spatial gradients in the electron column density transverse to the line of sight. These can be used to probe plasma structures and waves in the ionosphere. The regional (10-100 km) scales probed by the MWA, determined by the size of its FOV and the spatial density of radio sources (typically thousands in a single FOV), complement the global (100-1000 km) scales of GPS studies and local (0.01-1 km) scales of radar scattering measurements. Our data exhibit a range of complex structures and waves. Some fluctuations have the characteristics of traveling ionospheric disturbances, while others take the form of narrow, slowly drifting bands aligned along the Earth's magnetic field.

AB - Low-frequency, wide field-of-view (FOV) radio telescopes such as the Murchison Widefield Array (MWA) enable the ionosphere to be sampled at high spatial completeness. We present the results of the first power spectrum analysis of ionospheric fluctuations in MWA data, where we examined the position offsets of radio sources appearing in two data sets. The refractive shifts in the positions of celestial sources are proportional to spatial gradients in the electron column density transverse to the line of sight. These can be used to probe plasma structures and waves in the ionosphere. The regional (10-100 km) scales probed by the MWA, determined by the size of its FOV and the spatial density of radio sources (typically thousands in a single FOV), complement the global (100-1000 km) scales of GPS studies and local (0.01-1 km) scales of radar scattering measurements. Our data exhibit a range of complex structures and waves. Some fluctuations have the characteristics of traveling ionospheric disturbances, while others take the form of narrow, slowly drifting bands aligned along the Earth's magnetic field.

KW - Murchison Widefield Array

KW - ionosphere

KW - power spectrum

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JO - Radio Science

JF - Radio Science

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ER -

Power spectrum analysis of ionospheric fluctuations with the Murchison Widefield Array

Abstract

Keywords

ASJC Scopus subject areas

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