Thermospheric atomic oxygen density estimates using the EISCAT Svalbard Radar

Vickers, Hannah; Kosch, M. J.; Sutton, E. K.; Ogawa, Y.; Hoz, C. La

doi:10.1002/jgra.50169

Cited by 14 publications

(21 citation statements)

References 55 publications

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“…We also draw attention to a correction which has been made to the CHAMP measurement shown for pass 9. An earlier figure of 11.09 × 10 13 m −3 was published in the IPY study of Vickers et al [] and corresponded to the only case (pass 4) where the CHAMP measurement did not fall within the error bars of the ESR estimate. However, we have since identified that this measurement corresponded to an incorrect time.…”

Section: Analysis and Resultsmentioning

confidence: 82%

A solar cycle of upper thermosphere density observations from the EISCAT Svalbard Radar

et al. 2014

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We exploit a recently developed technique, based on ion-neutral coupling, which allows estimations of the upper thermospheric neutral density using measurements of ionospheric plasma parameters made by the European Incoherent Scatter (EISCAT) Svalbard Radar (ESR). The technique is applied to a 13 year long data set of measurements for the purpose of studying and quantifying the effect of solar activity on the upper thermospheric density inside the polar cap. We concentrate on the effect of solar activity at 350 km altitude and find a strong linear correlation between the ESR estimates for the atomic oxygen density and the solar irradiance proxy F 10.7 index. We use the relationship to isolate variations in the thermospheric density that are present after solar activity influences are removed. Our results show a decrease in the density of a few percent over the 13 year period, which is nevertheless smaller than the uncertainty associated with the decline. We anticipate that the statistical significance of this result will only increase by studying a longer data set. Conjunctions with the CHAMP satellite that show very good agreement is achieved at 350 km especially during low solar activity.

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Section: Analysis and Resultsmentioning

confidence: 82%

A solar cycle of upper thermosphere density observations from the EISCAT Svalbard Radar

et al. 2014

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“…In addition to the techniques reviewed by Osborne et al (2001), O density can be inferred, with several assumptions and under geomagnetically quiet conditions, from incoherent scatter radar (ISR) data (Bauer et al, 1970;Hedin and Alcayde, 1974;Buonsanto et al, 1992;references in Vickers et al, 2013;Nicolls et al, 2014). Vickers et al (2013) found that high-latitude upper thermospheric density inferred from ISR was typically 10% to 25% larger than corresponding CHAMP observations, the differences being within the uncertainties of the measurements.…”

Section: Other Techniquesmentioning

confidence: 98%

Thermospheric mass density: A review

Emmert

2015

Advances in Space Research

210

217

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“…Some results obtained from the CHAMP observations were summarized in the review paper presented by Lühr et al (2012). Vickers et al (2013) developed a new technique to obtain thermospheric neutral density at approximately 350 km altitude from incoherent scatter radar data. In situ comparisons with the CHAMP satellite show good agreement.…”

Section: Upper Thermospherementioning

confidence: 99%

The geospace response to variable inputs from the lower atmosphere: a review of the progress made by Task Group 4 of CAWSES-II

Oberheide

Shiokawa

Gurubaran

et al. 2015

Prog. in Earth and Planet. Sci.

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The advent of new satellite missions, ground-based instrumentation networks, and the development of whole atmosphere models over the past decade resulted in a paradigm shift in understanding the variability of geospace, that is, the region of the atmosphere between the stratosphere and several thousand kilometers above ground where atmosphere-ionosphere-magnetosphere interactions occur. It has now been realized that conditions in geospace are linked strongly to terrestrial weather and climate below, contradicting previous textbook knowledge that the space weather of Earth's near space environment is driven by energy injections at high latitudes connected with magnetosphere-ionosphere coupling and solar radiation variation at extreme ultraviolet wavelengths alone. The primary mechanism through which energy and momentum are transferred from the lower atmosphere is through the generation, propagation, and dissipation of atmospheric waves over a wide range of spatial and temporal scales including electrodynamic coupling through dynamo processes and plasma bubble seeding. The main task of Task Group 4 of SCOSTEP's CAWSES-II program, 2009 to 2013, was to study the geospace response to waves generated by meteorological events, their interaction with the mean flow, and their impact on the ionosphere and their relation to competing thermospheric disturbances generated by energy inputs from above, such as auroral processes at high latitudes. This paper reviews the progress made during the CAWSES-II time period, emphasizing the role of gravity waves, planetary waves and tides, and their ionospheric impacts. Specific campaign contributions from Task Group 4 are highlighted, and future research directions are discussed.

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Thermospheric atomic oxygen density estimates using the EISCAT Svalbard Radar

Cited by 14 publications

References 55 publications

A solar cycle of upper thermosphere density observations from the EISCAT Svalbard Radar

A solar cycle of upper thermosphere density observations from the EISCAT Svalbard Radar

Thermospheric mass density: A review

The geospace response to variable inputs from the lower atmosphere: a review of the progress made by Task Group 4 of CAWSES-II

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