Meteorological control of the D region

Taubenheim, J.

doi:10.1007/bf00168831

Cited by 32 publications

(11 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Although VLF NB amplitudes were already associated in previous studies to the dynamics and temperatures of the stratosphere [e.g., Correia et al, 2011], the relation between VLF NB amplitudes and mesopause temperatures, either direct or indirect, has not been identified previously. However, a connection between mesopause temperatures and radio waves absorption has been predicted before [e.g., Taubenheim, 1983].…”

Section: Discussionmentioning

confidence: 95%

“…The main sources for ionization of the ionospheric D and E layers are solar extreme ultra violet (EUV) and X-ray radiation [Hargreaves, 1995]. However, the ionosphere's composition is also affected by the medium's temperature and density [Taubenheim, 1983;Hargreaves, 1995;Kopp, 2000;Kamide and Chian, 2007]. Since the available incoming solar radiation is a function of the solar zenith angle, which depends on the latitude, time of day, and stage of the annual cycle [Kopp, 2000], the ion composition and therefore also the electrical conductivity of the region depend on the time of year.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Links between mesopause temperatures and ground‐based VLF narrowband radio signals

et al. 2013

View full text Add to dashboard Cite

[1] The Upper Mesosphere-Lower Thermosphere (UMLT) region of the atmosphere is known to vary on many temporal and spatial scales. However, this region of the atmosphere is very difficult to measure and monitor continuously. In this paper, we demonstrate an intriguing connection between mesopause temperatures and the intensity of very low frequencies (VLF) narrowband (NB) signals reflected off the lower ionosphere. The temperature data used are from the SABER instrument onboard the TIMED satellite, while the VLF data are obtained from various ground-based receiving systems. The results of the analysis show a high anticorrelation between temperature and VLF amplitude. It is shown that the variability of the UMLT temperatures and VLF amplitudes can be explained by global seasonal solar irradiance changes (~72% of the variability), while the remaining variability has its origins from other sources (~28%). High-resolution mesopause temperature estimates might be achieved in the future by combining VLF NB observations and calculated solar irradiance variability (as a function of hour, day, and location, i.e., latitude).Citation: Silber, I., C. Price, C. J. Rodger, and C. Haldoupis (2013), Links between mesopause temperatures and groundbased VLF narrowband radio signals,

show abstract

Section: Discussionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Links between mesopause temperatures and ground‐based VLF narrowband radio signals

et al. 2013

View full text Add to dashboard Cite

show abstract

“…[23] Muraoka [1983] and Muraoka et al [1986] showed that the winter anomaly leads to perturbed (electron density) conditions in the lower ionosphere and that it is related to an intensification of mesospheric planetary waves. Taubenheim [1983] suggested the meteorological control of the D region, and Kazimirovsky [2002] and Laštovička [2006] have shown that the ionospheric plasma distribution may be modulated by forcings from external origins and from troposphericmesospheric origins. [24] Figure 7 displays the latitudinal variations of the atmospheric temperature measurements between 00:00 and 09:00 UT made by TIMED-SABER satellite passages within selected boxes in the 280°E-300°E longitude range, namely, (C1) 25°N-45°N, (C2) 0°-20°N, (C3) 18°S-38°S…”

Section: Discussionmentioning

confidence: 99%

Lower ionosphere monitoring by the South America VLF Network (SAVNET): C region occurrence and atmospheric temperature variability

et al. 2013

View full text Add to dashboard Cite

[1] Daily profiles of phase measurements as observed on fixed VLF paths generally show a transient phase advance, followed by a phase delay, for about 90 min after sunrise hours. This is indicative of a reflecting ionospheric C region developing along the terminator line at an altitude below the normal D region. The suggested occurrence of a C region is consistent with rocket measurements made in the 1960s, showing a maximum of the electron density between 64 and 68 km, and by radio sounding in the 1980s. In order to correctly describe the properties of the phase effect associated with the presence of a C region, it is important to understand the subionospheric propagation characteristics of the VLF paths. In this paper, we analyze the variations presented by the temporal properties of the VLF narrowband phase effect and determined a parameter associated with the appearance of the C region at sunrise hours observed by receivers from the South America VLF Network. Periodic patterns emerge from the parameter curves. Two distinct temporal behavior regimes can be identified: one exhibiting slow variations between March and October, and another one exhibiting faster variations between October and March. Solar illumination conditions and the geometrical configuration of the VLF paths relative to the sunrise terminator partly explain the slow variation regime. During periods of faster variations, we have observed good association with atmospheric temperature variability found in the measurements of the Thermosphere Ionosphere Mesosphere Energetics and Dynamics and Sounding of the Atmosphere using Broadband Emission Radiometry satellite instrument, which we assume to be related to the winter anomaly atmospheric phenomenon. However, when comparing the parameter time series with temperature curves, no direct one-to-one correspondence was found for transient events.Citation: Bertoni, F. C. P., J.-P. Raulin, H. R. Gavila´n, P. Kaufmann, R. Rodriguez, M. Clilverd, J. S. Cardenas, and G. Fernandez (2013), Lower ionosphere monitoring by the South America VLF Network (SAVNET): C region occurrence and atmospheric temperature variability,

show abstract

“…At the same time groundbased, rocket and satellite-board soundings of temperatures and winds in the upper mesosphere-lower thermosphere (MLT-region) exhibit variation patterns with temporal and spatial scales which are to be described by the term «meteorology». Thus, nowadays it is possible to introduce into practice the «meteorological control» of the D-region for the explanations of some events (Taubenheim, 1983;Danilov et al,1987). It means that the lower ionosphere exhibits not only a solar, but also a strong non-solar control which is partly of a meteorological nature.…”

Section: The Lower Thermosphere/ionospherementioning

confidence: 99%