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A comparison of overshoot modelling with observations of polar mesospheric summer echoes at radar frequencies of 56 and 224 MHz

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A comparison of overshoot modelling with observations of polar mesospheric summer echoes at radar frequencies of 56 and 224 MHz. / Havnes, O.; Pinedo, H.; La Hoz, C. et al.
In: Annales Geophysicae, Vol. 33, No. 6, 16.06.2015, p. 737-747.

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

Harvard

Havnes, O, Pinedo, H, La Hoz, C, Senior, A, Hartquist, TW, Rietveld, MT & Kosch, MJ 2015, 'A comparison of overshoot modelling with observations of polar mesospheric summer echoes at radar frequencies of 56 and 224 MHz', Annales Geophysicae, vol. 33, no. 6, pp. 737-747. https://doi.org/10.5194/angeo-33-737-2015

APA

Havnes, O., Pinedo, H., La Hoz, C., Senior, A., Hartquist, T. W., Rietveld, M. T., & Kosch, M. J. (2015). A comparison of overshoot modelling with observations of polar mesospheric summer echoes at radar frequencies of 56 and 224 MHz. Annales Geophysicae, 33(6), 737-747. https://doi.org/10.5194/angeo-33-737-2015

Vancouver

Havnes O, Pinedo H, La Hoz C, Senior A, Hartquist TW, Rietveld MT et al. A comparison of overshoot modelling with observations of polar mesospheric summer echoes at radar frequencies of 56 and 224 MHz. Annales Geophysicae. 2015 Jun 16;33(6):737-747. doi: 10.5194/angeo-33-737-2015

Author

Havnes, O. ; Pinedo, H. ; La Hoz, C. et al. / A comparison of overshoot modelling with observations of polar mesospheric summer echoes at radar frequencies of 56 and 224 MHz. In: Annales Geophysicae. 2015 ; Vol. 33, No. 6. pp. 737-747.

Bibtex

@article{592dbb870d04404a84f60291e09b7edf,
title = "A comparison of overshoot modelling with observations of polar mesospheric summer echoes at radar frequencies of 56 and 224 MHz",
abstract = "We have compared radar observations of polar mesospheric summer echoes (PMSEs) modulated by artificial electron heating, at frequencies of 224 MHz (EISCAT VHF) and 56 MHz (MORRO). We have concentrated on 1 day of observation, lasting 3.8 h. The MORRO radar, with its much wider beam, observes one or more PMSE layers all the time while the VHF radar observes PMSEs in 69% of the time. Statistically there is a clear difference between how the MORRO and the VHF radar backscatter reacts to the heater cycling (48 s heater on and 168 s heater off). While MORRO often reacts by having its backscatter level increased when the heater is switched on, as predicted by Scales and Chen (2008), the VHF radar nearly always sees the 'normal' VHF overshoot behaviour with an initial rapid reduction of backscatter. However, in some heater cycles we do see a substantial recovery of the VHF backscatter after its initial reduction to levels several times above that just before the heater was switched on. For the MORRO radar a recovery during the heater-on phase is much more common. The reaction when the heater was switched off was a clear overshoot for nearly all VHF cases but less so for MORRO. A comparison of individual curves for the backscatter values as a function of time shows, at least for this particular day, that in high layers above 85 km height, both radars see a reduction of the backscatter as the heater is switched on, with little recovery during the heater-on time. These variations are well described by present models. On the other hand, the backscatter in low layers at 81-82 km can be quite different, with modest or no reduction in backscatter as the heater is switched on, followed by a strong recovery for both radars to levels several times above that of the undisturbed PMSEs. This simultaneous, nearly identical behaviour at the two very different radar frequencies is not well described by present modelling.",
keywords = "Atmospheric composition and structure, aerosols and particles, COMMON-VOLUME OBSERVATIONS, EARTHS MESOSPHERE, DUST PARTICLES, NOCTILUCENT CLOUDS, MESOPAUSE REGION, PMSE OVERSHOOT, CHARGED DUST, AEROSOL-PARTICLES, METEORIC SMOKE, ICE PARTICLES",
author = "O. Havnes and H. Pinedo and {La Hoz}, C. and A. Senior and Hartquist, {T. W.} and Rietveld, {M. T.} and Kosch, {M. J.}",
year = "2015",
month = jun,
day = "16",
doi = "10.5194/angeo-33-737-2015",
language = "English",
volume = "33",
pages = "737--747",
journal = "Annales Geophysicae",
issn = "0992-7689",
publisher = "European Geosciences Union",
number = "6",

}

RIS

TY - JOUR

T1 - A comparison of overshoot modelling with observations of polar mesospheric summer echoes at radar frequencies of 56 and 224 MHz

AU - Havnes, O.

AU - Pinedo, H.

AU - La Hoz, C.

AU - Senior, A.

AU - Hartquist, T. W.

AU - Rietveld, M. T.

AU - Kosch, M. J.

PY - 2015/6/16

Y1 - 2015/6/16

N2 - We have compared radar observations of polar mesospheric summer echoes (PMSEs) modulated by artificial electron heating, at frequencies of 224 MHz (EISCAT VHF) and 56 MHz (MORRO). We have concentrated on 1 day of observation, lasting 3.8 h. The MORRO radar, with its much wider beam, observes one or more PMSE layers all the time while the VHF radar observes PMSEs in 69% of the time. Statistically there is a clear difference between how the MORRO and the VHF radar backscatter reacts to the heater cycling (48 s heater on and 168 s heater off). While MORRO often reacts by having its backscatter level increased when the heater is switched on, as predicted by Scales and Chen (2008), the VHF radar nearly always sees the 'normal' VHF overshoot behaviour with an initial rapid reduction of backscatter. However, in some heater cycles we do see a substantial recovery of the VHF backscatter after its initial reduction to levels several times above that just before the heater was switched on. For the MORRO radar a recovery during the heater-on phase is much more common. The reaction when the heater was switched off was a clear overshoot for nearly all VHF cases but less so for MORRO. A comparison of individual curves for the backscatter values as a function of time shows, at least for this particular day, that in high layers above 85 km height, both radars see a reduction of the backscatter as the heater is switched on, with little recovery during the heater-on time. These variations are well described by present models. On the other hand, the backscatter in low layers at 81-82 km can be quite different, with modest or no reduction in backscatter as the heater is switched on, followed by a strong recovery for both radars to levels several times above that of the undisturbed PMSEs. This simultaneous, nearly identical behaviour at the two very different radar frequencies is not well described by present modelling.

AB - We have compared radar observations of polar mesospheric summer echoes (PMSEs) modulated by artificial electron heating, at frequencies of 224 MHz (EISCAT VHF) and 56 MHz (MORRO). We have concentrated on 1 day of observation, lasting 3.8 h. The MORRO radar, with its much wider beam, observes one or more PMSE layers all the time while the VHF radar observes PMSEs in 69% of the time. Statistically there is a clear difference between how the MORRO and the VHF radar backscatter reacts to the heater cycling (48 s heater on and 168 s heater off). While MORRO often reacts by having its backscatter level increased when the heater is switched on, as predicted by Scales and Chen (2008), the VHF radar nearly always sees the 'normal' VHF overshoot behaviour with an initial rapid reduction of backscatter. However, in some heater cycles we do see a substantial recovery of the VHF backscatter after its initial reduction to levels several times above that just before the heater was switched on. For the MORRO radar a recovery during the heater-on phase is much more common. The reaction when the heater was switched off was a clear overshoot for nearly all VHF cases but less so for MORRO. A comparison of individual curves for the backscatter values as a function of time shows, at least for this particular day, that in high layers above 85 km height, both radars see a reduction of the backscatter as the heater is switched on, with little recovery during the heater-on time. These variations are well described by present models. On the other hand, the backscatter in low layers at 81-82 km can be quite different, with modest or no reduction in backscatter as the heater is switched on, followed by a strong recovery for both radars to levels several times above that of the undisturbed PMSEs. This simultaneous, nearly identical behaviour at the two very different radar frequencies is not well described by present modelling.

KW - Atmospheric composition and structure

KW - aerosols and particles

KW - COMMON-VOLUME OBSERVATIONS

KW - EARTHS MESOSPHERE

KW - DUST PARTICLES

KW - NOCTILUCENT CLOUDS

KW - MESOPAUSE REGION

KW - PMSE OVERSHOOT

KW - CHARGED DUST

KW - AEROSOL-PARTICLES

KW - METEORIC SMOKE

KW - ICE PARTICLES

U2 - 10.5194/angeo-33-737-2015

DO - 10.5194/angeo-33-737-2015

M3 - Journal article

VL - 33

SP - 737

EP - 747

JO - Annales Geophysicae

JF - Annales Geophysicae

SN - 0992-7689

IS - 6

ER -