Lower Ionosphere Effect Observed During the June 30, 1992 Total Solar Eclipse

Costa, Aracy Mendes da; Leme, Neusa Maria Paes; Piazza, L. Rizzo

doi:10.3997/2214-4609-pdb.324.550

Cited by 7 publications

(9 citation statements)

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“…As shown in Figure 5, the time delay of the phase peak of LF transmitter signals after totality was 2–10 min. Previous studies also showed a similar time delay of 4–7 min [ Sen Gupta et al , 1980; Lynn , 1981; Mendes Da Costa et al , 1995]. We speculated that the following two factors might have caused the time delay: the electron production rate of the partial solar eclipse after totality and the electron loss rate by recombination.…”

Section: Discussionsupporting

confidence: 62%

Reflection height of daytime tweek atmospherics during the solar eclipse of 22 July 2009

Ohya¹,

Tsuchiya²,

Nakata³

et al. 2012

J. Geophys. Res.

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[1] We report multipoint observations of daytime tweek atmospherics during the solar eclipse of 22 July 2009. Sixteen and sixty-three tweek atmospherics were observed at Moshiri and Kagoshima, Japan, where the magnitudes of the solar eclipse were 0.458 and 0.966, respectively. This was the first observation of tweek atmospherics during a low-magnitude eclipse (0.458). The average and standard deviation of the reflection height were 94.9 AE 13.7 km at Moshiri and 87.2 AE 12.9 km at Kagoshima. The reflection height at Moshiri was almost the same as that for normal nighttime conditions in July (96.7 AE 12.6 km) in spite of the low magnitude of the eclipse. The reflection height at Kagoshima seems be divided into two parts: propagation across the total solar eclipse path and propagation in the partial solar eclipse path. During the eclipse, we also observed the phase variation in the LF transmitter signals. The average change in the phase delay of the LF signals was 109 for the paths that crossed the eclipse path and 27 for the paths that did not cross the eclipse path. Assuming a normal daytime height for LF waves of 65 km, a ray tracing analysis indicates that the variations in phase correspond to a height increase of 5-6 km for the paths across the eclipse and 1-2 km for partial eclipse paths. The wide range of estimated tweek reflection heights at Kagoshima also suggests a difference in electron density in the lower ionosphere between total and partial solar eclipses.

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Section: Discussionsupporting

confidence: 62%

Reflection height of daytime tweek atmospherics during the solar eclipse of 22 July 2009

Ohya¹,

Tsuchiya²,

Nakata³

et al. 2012

J. Geophys. Res.

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“…[ Dixit and Rao , 1980; Chandra et al , 2007]. Also, the influence of eclipses on the low‐latitude D‐region (i.e., over the equatorial anomaly region) is much less studied during ionospheric sunrise transition period [ Mechtly et al , 1969; Patel et al , 1986; Mendes da Costa et al , 1995; Clilverd et al , 2001]. A solar eclipse is similar to the onset of a short‐time night; therefore, the accompanying effects in both cases are normally expected to be similar.…”

Section: Introductionmentioning

confidence: 99%

Response of the equatorial lower ionosphere to the total solar eclipse of 22 July 2009 during sunrise transition period studied using VLF signal

Guha

Roy

et al. 2010

J. Geophys. Res.

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[1] Changes in equatorial D-region electron density are studied using subionospherically propagating VLF signal at 18.2 kHz over a distance of 2200 km during the total solar eclipse of 22 July 2009. There are very few studies about the eclipse's effects on the equatorial lower ionosphere in the scientific literature. In the light of that, the objective of the present work is to study the effects of the eclipse on the dynamics of the equatorial lower ionosphere during ionospheric sunrise transition period. In the present case, great circle path between VLF transmitter and receiver falls totally in partial eclipse zone, having a maximum solar obscuration of 90% and an average obscuration of 74%. Results show an average decrease of 3.2 dB in signal strength compared to control days during peak solar obscuration over the path. A comparison with previous studies shows an increase both in lower ionosphere virtual reflection height (H′) and Wait inverse scale height parameter , respectively. During maximum eclipse over the path, the model profile shows an average 80% drop in electron density at a height of 71 km at equatorial lower ionosphere. A nonlinear variation of lower ionosphere electron density with solar radiation is found as opposed to the model study proposed by previous workers.Citation: Guha, A., B. K. De, R. Roy, and A. Choudhury (2010), Response of the equatorial lower ionosphere to the total solar eclipse of 22 July 2009 during sunrise transition period studied using VLF signal,

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“…It was called as RFI when any disruption created from natural sources or man-made that affects it. There are past investigations reported by [6] and [7] found that two significance effects during a solar eclipse were signal frequency and path length. This RFI survey must be done for radio astronomical purposes in order to know the quality signal of the Sun.…”

Section: Introductionmentioning

confidence: 97%

Influence of Partial Solar Eclipse on the Radio Signal during 9 March 2016

Afandi

Umar

Ibrahim

et al. 2017

International Journal on Advanced Science, Engineering and Information Technology

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The occasion of the partial solar eclipse in Malaysia occurred on 9th March 2016 covered almost 67% to 80% of the whole Sun. During the maximum time of the partial solar eclipse, some of the solar emission and sunlight was blocked to reach the Earth's surface. In order to see this effect to a radio signal, the analysis of radio signal pattern before and during the solar eclipse at Balai Cerap KUSZA, Merang, Terengganu was done. The radio signal measurement was taken in the wideband frequency region from 0Hz to 9GHz. The radio signal data had been analysis to compare between before and during the eclipse by calculating their average. Initial analysis shows that there a different number of peak signal between two observations. Then, the solar radiation data during the partial solar eclipse also was analysed. Furthermore, solar events data from National Oceanic and Atmospheric Administration (NOAA) also added into this work. It shows that there not enough prove that the partial solar eclipse affects the radio signal pattern.

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Lower Ionosphere Effect Observed During the June 30, 1992 Total Solar Eclipse

Cited by 7 publications

References 0 publications

Reflection height of daytime tweek atmospherics during the solar eclipse of 22 July 2009

Reflection height of daytime tweek atmospherics during the solar eclipse of 22 July 2009

Response of the equatorial lower ionosphere to the total solar eclipse of 22 July 2009 during sunrise transition period studied using VLF signal

Influence of Partial Solar Eclipse on the Radio Signal during 9 March 2016

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