First evidence of a 27 day solar signature in noctilucent cloud occurrence frequency

Robert, Charles; Savigny, Christian von; Rahpoe, N.; Bovensmann, H.; Burrows, J. P.; DeLand, Matthew T.; Schwartz, M.

doi:10.1029/2009jd012359

Cited by 42 publications

(48 citation statements)

References 53 publications

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“…Satellite observations from the Halogen Occultation Experiment [Hervig and Siskind, 2006] and the Solar Backscatter Ultraviolet instruments [Shettle et al, 2009] have shown this anticorrelation of PMCs with Lyman a. Recently, a variation associated with the 27 day solar rotation has also been identified [Robert et al, 2010]. Ground-based results, however, have been less conclusive, with a solar cycle variation identified in only a subset of the available data [Fiedler et al, 2011].…”

Section: Introductionmentioning

confidence: 99%

Recent observations of high mass density polar mesospheric clouds: A link to space traffic?

Siskind

Stevens

Hervig

et al. 2013

Geophysical Research Letters

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[1] Observations of polar mesospheric clouds by the Aeronomy of Ice in the Mesosphere Explorer show that for the Northern summers of 2007-2010, the cloud ice water content (IWC) and occurrence frequency varied with the meteorological forcing from the Southern winter stratosphere. With the increase in solar flux in the last two years, expectations were that the clouds would decrease due to reduced water vapor (H 2 O) and/or higher temperatures. Surprisingly, we observe more clouds in 2011 and 40% greater IWC in 2011 and 2012. The increase is particularly pronounced in the clouds with highest IWC. These high IWC clouds are associated with significant enhancements in total H 2 O (vapor and ice). We suggest this implies an additional source of H 2 O and that this is provided by space traffic exhaust. A preliminary estimate of the H 2 O released from summertime space traffic over the last six years is qualitatively consistent with this suggestion. Citation:

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Section: Introductionmentioning

confidence: 99%

Recent observations of high mass density polar mesospheric clouds: A link to space traffic?

Siskind

Stevens

Hervig

et al. 2013

Geophysical Research Letters

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“…This should result in less ice-particle formation (von Zahn et al, 2004) and hence should affect PMSE. Variation of solar radiation could also influence atmospheric temperature via production of ozone after photodissociation of O 2 (Robert et al, 2010) and via changing atmospheric dynamics. Kirkwood et al (2010b) have found an empirical relation between PMSE η and ionospheric plasma and ice particle parameters using the 54 MHz radar MARA at Wasa, Antarctica and the SOFIE instrument onboard the AIM satellite.…”

Section: Pmse Volume Reflectivity and Solar Fluxmentioning

confidence: 99%

Polar mesosphere summer echo strength in relation to solar variability and geomagnetic activity during 1997–2009

Smirnova

Belova²,

Kirkwood³

2011

Ann. Geophys.

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Abstract. This paper is based on measurements of Polar Mesosphere Summer Echoes (PMSE) with the 52 MHz radar ESRAD, located near Kiruna, in Northern Sweden, during the summers of 1997–2009. Here, a new independent calibration method allowing estimation of possible changes in antenna feed losses and transmitter output is described and implemented for accurate calculation of year-to-year variations of PMSE strength (expressed in absolute units – radar volume reflectivity η). The method is based on radar-radiosonde comparisons in the upper troposphere/lower stratosphere region simultaneously with PMSE observations. Inter-annual variations of PMSE volume reflectivity are found to be strongly positively correlated with the local geomagnetic K-index, both when averaged over all times of the day, and when considering 3-h UT intervals separately. Increased electron density due to energetic particle precipitation from the magnetosphere is suggested as one of the possible reasons for such a correlation. Enhanced ionospheric electric field may be another reason but this requires further study. Multi-regression analysis of inter-annual variations of PMSE η shows also an anti-correlation with solar 10.7 cm flux and the absence of any statistically significant trend in PMSE strength over the interval considered (13-years). Variations related to solar flux and K-index account for 86% of the year-to-year variations in radar volume reflectivity.

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“…Before averaging the different epochs, anomaly time series are determined by removing an 18 day running mean from each individual time series. The choice of an 18 day running mean is slightly arbitrary, but tests showed that the results obtained using a 15 day or 20 day running mean are very similar, in agreement with similar tests performed for identifying a solar 27 day signature in noctilucent clouds [Robert et al, 2010]. The anomaly time series for OH rotational temperature, OH emission rate, OI emission rate, and atomic oxygen were then smoothed with a 3 day running mean in order to reduce variability.…”

Section: Resultsmentioning

confidence: 56%

Lunar semidiurnal tide in the terrestrial airglow

Savigny

Lednyts'kyy

Forbes

et al. 2015

Geophysical Research Letters

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We report on lunar semidiurnal tidal signatures in several parameters of the terrestrial airglow, including OI green line emission rates, OH(3‐1) emission rates, as well as OH emission altitude, atomic oxygen, and OH(3‐1) rotational temperature in the mesosphere/lower thermosphere region. The parameters were retrieved from spaceborne measurements of nightglow emissions at low latitudes with the Scanning Imaging Absorption Spectrometer for Atmospheric Chartography instrument on the Envisat satellite. The identified lunar tidal signatures in airglow emissions have amplitudes of a few percent and are highly significant statistically. Moreover, the signatures observed in the different parameters analyzed show a coherent behavior consistent with the view that they are caused by vertical motions associated with vertical transport of atomic oxygen and adiabatic cooling/heating. The observed lunar semidiurnal tidal signature in temperature is in good agreement with model simulations with the global scale wave model.

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First evidence of a 27 day solar signature in noctilucent cloud occurrence frequency

Cited by 42 publications

References 53 publications

Recent observations of high mass density polar mesospheric clouds: A link to space traffic?

Recent observations of high mass density polar mesospheric clouds: A link to space traffic?

Polar mesosphere summer echo strength in relation to solar variability and geomagnetic activity during 1997–2009

Lunar semidiurnal tide in the terrestrial airglow

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