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Found 9 entries in the Bibliography.
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2019 |
Mikhailov, Andrey; Perrone, Loredana; Published by: Scientific reports Published on: |
2015 |
The annual asymmetry in the F 2 layer during deep solar minimum (2008-2009): December anomaly Annual January/July midlatitude daytime asymmetry in monthly median NmF2 and model thermospheric parameters has been considered during deep solar minimum, (2008\textendash2009), when solar and geomagnetic activities were at the lowest level, to analyze the background effect due to the Sun-Earth minimum distance, perihelion, in the vicinity of the December solstice. Averaged over 10 midlatitude station pairs, the NmF2 asymmetry was found to be ≈1.23, while the average asymmetry for the annual component in NmF2 variations is ≈1.17. Annual asymmetry in monthly median neutral composition and temperature predicted by Mass Spectrometer Incoherent Scatter 86 (MSIS86) and MSISE00 thermospheric models along with the 7\% increase in solar EUV flux in the vicinity of the December solstice is sufficient to explain the observed annual asymmetry in NmF2. A hierarchy of aeronomic parameters responsible for the observed asymmetry in NmF2 has been established: the main contributor is atomic oxygen\textemdashabout 50\% of the total effect, [N2] contributes around 35\% strongly compensating the [O] contribution, and solar EUV and Tn provide \<10\% each. The zonal mean annual asymmetry in MSIS86 atomic oxygen column density was shown to be 1.18 at low and middle latitudes, and this is close to the estimated asymmetry for the annual component in NmF2 variations. The earlier proposed mechanism of the December anomaly is considered as a plausible one to explain the 1.18 January/July asymmetry in the atomic oxygen variations and consequently the NmF2 annual daytime asymmetry at middle latitudes under the deep solar minimum. Published by: Journal of Geophysical Research: Space Physics Published on: 02/2015 YEAR: 2015   DOI: 10.1002/2014JA020929 midlatitude ionosphere; thermosphere composition and structure |
2012 |
Mikhailov, A.V.; Perrone, L.; Smirnova, N.V.; Published by: Journal of Atmospheric and Solar-Terrestrial Physics Published on: Jan-06-2012 YEAR: 2012   DOI: 10.1016/j.jastp.2012.04.003 |
A new method has been developed to retrieve neutral temperature Tn and composition [O], [N2], [O2] from electron density profiles in the daytime mid-latitude F2-region under both quiet and disturbed conditions. A comparison with CHAMP neutral gas density observations in the vicinity of Millstone Hill Incoherent Scatter Radar (ISR) has shown that the retrieved neutral gas densities coincide with the observed ones within the announced accuracy of CHAMP observations, provided that accurate Ne(h) ISR profiles are used for the retrieval. The performance of the method has also been tested ingesting Digisonde Ne(h) profiles. In this case the agreement with CHAMP neutral gas density observations is less successful. Possible factors that can influence the performance accuracy are investigated. These are mostly related to limitations due to the ionogram scaling and inversion methods, including performance limitations of the sounding technique itself, like for instance during G-conditions. Several tests presented here demonstrate that discrepancies in the hmF2 values provided by the Digisondes could have an important impact on the performance of the method. It should be noted that in all tests performed here using Digisonde Ne(h) profiles, the topside part is approximated with the NeQuick model and any assessment concerning the impact of the topside profiler on the accuracy of the method is beyond the scope of this investigation. Despite the limitations related to the use of Digisonde profiles, the proposed method has the potential to monitor the thermosphere at least with ISR Ne(h) profiles. Digisonde electron density profiles can also be used if quality improvements are made concerning the ionogram inversion methods. Mikhailov, A.V.; Belehaki, A.; Perrone, L.; Zolesi, B.; Tsagouri, I.; Published by: Journal of Space Weather and Space Climate Published on: 06/2012 YEAR: 2012   DOI: 10.1051/swsc/2012002 ionosphere/atmosphere interactions; ionosphere: instruments; Ionospheric storms; techniques; thermospheric dynamics; topside ionosphere |
Satellite observations similar to CHAMP or TIMED/GUVI provide valuable information on the thermosphere but they can be used only for scientific research rather than applications as a Mikhailov, AV; Belehaki, A; Perrone, L; Zolesi, B; Tsagouri, I; Published by: Journal of Space Weather and Space Climate Published on: YEAR: 2012   DOI: https://doi.org/10.1051/swsc/2012002 |
2011 |
Published by: Journal of Geophysical Research Published on: Jan-01-2011 YEAR: 2011   DOI: 10.1029/2010JA016122 |
2007 |
Mikhailov, AV; Depueva, AH; Depuev, VH; Published by: Published on: |
Mikhailov, AV; Depuev, VH; Depueva, AH; Published by: Published on: |
Mikhailov, A.V.; Depuev, V.H.; Depueva, A.H.; , others; Published by: Published on: |
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