First observations of E‐region Near Range Echoes partially modulated by F‐region Traveling Ionospheric Disturbances observed by the same SuperDARN HF radar

Physics

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https://doi.org/10.1029/2021ja030157
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Available under license: CC BY-NC: Creative Commons Attribution-NonCommercial 4.0 International License

Keywords

TID, SuperDARN, NRE, GDI, Electric Filed, partially Modulate

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First observations of E‐region Near Range Echoes partially modulated by F‐region Traveling Ionospheric Disturbances observed by the same SuperDARN HF radar. / HIYADUTUJE, Alicreance; Kosch, Michael J.; Stephenson, Judy A.E.
In: Journal of Geophysical Research: Space Physics, Vol. 127, No. 5, e2021JA030157, 31.05.2022.

Research output: Contribution to Journal/Magazine › Journal article › peer-review

Bibtex

@article{528cb1fcc5f241f79725c410fe412f9f,

title = "First observations of E‐region Near Range Echoes partially modulated by F‐region Traveling Ionospheric Disturbances observed by the same SuperDARN HF radar",

abstract = "We present the first observations from SuperDARN HF radar data of E-region Near Range Echoes (NREs) whose amplitudes are partially modulated by Medium-Scale Traveling Ionospheric Disturbances (MSTIDs) propagating in the F-region overhead that have been observed by the same radar in the far ranges. SuperDARN NREs occur normally ∼180-315 km downrange from the radar at ∼95-125 km altitude. Selected observations of TID-modulated NREs are presented from SANAE and Zhongshan Antarctic SuperDARN radars for both summer and winter seasons as well as geomagnetic active and quiet times. We show that the most likely mechanism is partial modulation of the Gradient Drift Instability (GDI), which is responsible for producing the NREs. GDI is driven by the velocity difference between neutrals and ions and may appear in the E-region ionosphere wherever suitable plasma density gradients exist. GDI already present in the E-region can be partially modulated by a MSTID passing overhead in the F-region via the additional MSTID polarization electric field mapped down in altitude along the equipotential magnetic field lines, thereby partially modulating the NRE amplitudes as observed.",

keywords = "TID, SuperDARN, NRE, GDI, Electric Filed, partially Modulate",

author = "Alicreance HIYADUTUJE and Kosch, {Michael J.} and Stephenson, {Judy A.E.}",

year = "2022",

month = may,

day = "31",

doi = "10.1029/2021ja030157",

language = "English",

volume = "127",

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

issn = "2169-9380",

publisher = "Blackwell Publishing Ltd",

number = "5",

}

RIS

TY - JOUR

T1 - First observations of E‐region Near Range Echoes partially modulated by F‐region Traveling Ionospheric Disturbances observed by the same SuperDARN HF radar

AU - HIYADUTUJE, Alicreance

AU - Kosch, Michael J.

AU - Stephenson, Judy A.E.

PY - 2022/5/31

Y1 - 2022/5/31

N2 - We present the first observations from SuperDARN HF radar data of E-region Near Range Echoes (NREs) whose amplitudes are partially modulated by Medium-Scale Traveling Ionospheric Disturbances (MSTIDs) propagating in the F-region overhead that have been observed by the same radar in the far ranges. SuperDARN NREs occur normally ∼180-315 km downrange from the radar at ∼95-125 km altitude. Selected observations of TID-modulated NREs are presented from SANAE and Zhongshan Antarctic SuperDARN radars for both summer and winter seasons as well as geomagnetic active and quiet times. We show that the most likely mechanism is partial modulation of the Gradient Drift Instability (GDI), which is responsible for producing the NREs. GDI is driven by the velocity difference between neutrals and ions and may appear in the E-region ionosphere wherever suitable plasma density gradients exist. GDI already present in the E-region can be partially modulated by a MSTID passing overhead in the F-region via the additional MSTID polarization electric field mapped down in altitude along the equipotential magnetic field lines, thereby partially modulating the NRE amplitudes as observed.

AB - We present the first observations from SuperDARN HF radar data of E-region Near Range Echoes (NREs) whose amplitudes are partially modulated by Medium-Scale Traveling Ionospheric Disturbances (MSTIDs) propagating in the F-region overhead that have been observed by the same radar in the far ranges. SuperDARN NREs occur normally ∼180-315 km downrange from the radar at ∼95-125 km altitude. Selected observations of TID-modulated NREs are presented from SANAE and Zhongshan Antarctic SuperDARN radars for both summer and winter seasons as well as geomagnetic active and quiet times. We show that the most likely mechanism is partial modulation of the Gradient Drift Instability (GDI), which is responsible for producing the NREs. GDI is driven by the velocity difference between neutrals and ions and may appear in the E-region ionosphere wherever suitable plasma density gradients exist. GDI already present in the E-region can be partially modulated by a MSTID passing overhead in the F-region via the additional MSTID polarization electric field mapped down in altitude along the equipotential magnetic field lines, thereby partially modulating the NRE amplitudes as observed.

KW - TID

KW - SuperDARN

KW - NRE

KW - GDI

KW - Electric Filed

KW - partially Modulate

U2 - 10.1029/2021ja030157

DO - 10.1029/2021ja030157

M3 - Journal article

VL - 127

JO - Journal of Geophysical Research: Space Physics

JF - Journal of Geophysical Research: Space Physics

SN - 2169-9380

IS - 5

M1 - e2021JA030157

ER -

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