Ionospheric effects of two recent solar eclipses

Marriott, R. T.; John, D. E. St.; Thorne, R. M.; Venkateswaran, S.; Mahadevan, Priya

doi:10.1016/0021-9169(72)90157-2

Cited by 17 publications

(12 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Theoretical predictions of the response of the F region to this eclipse were also made by Stubbe [1970]. A satisfactory agreement with previous experimental work was found for the F2 region, but not for this eclipse [see Marriott et al, 1972]. In order to simulate the eclipse behavior of the F2 region for this eclipse, Flaherty et al This eclipse did, however, appear to generate waves which propagated away from the bow wave.…”

Section: This Results Is In Contrast To That Of Klobuchar Andsupporting

confidence: 54%

The study of the effect of solar eclipses on the ionosphere based on satellite beacon observations

Cohen¹

1984

Radio Science

View full text Add to dashboard Cite

Satellite beacon observations during eclipses have provided much information on the behavior of the ionosphere. A combination of Faraday rotation and differential phase measurements as well as ionosonde data can provide information on the topside and bottomside ionospheric behavior during an eclipse as well as on the production rate. Recent attention has been directed toward a study of the dynamics of the F region during an eclipse and the relation between the amount of depletion in the total electron content and the percent obscuration of the sun. Of particular interest is the time delay from the maximum obscuration to the maximum depletion of the total electron content. Further modeling studies are required in order to reproduce the experimental results. Further observations are also required in order to establish whether TID's are generated following a total solar eclipse as predicted theoretically. In particular, it appears that a more sensitive technique such as differential Doppler rather than Faraday rotation is required. The total solar eclipse of June 11, 1983, with its long totality time of 4–5 min over Indonesia and Papua New Guinea will provide an ideal opportunity for further studies of these unanswered questions.

show abstract

Section: This Results Is In Contrast To That Of Klobuchar Andsupporting

confidence: 54%

The study of the effect of solar eclipses on the ionosphere based on satellite beacon observations

Cohen¹

1984

Radio Science

View full text Add to dashboard Cite

show abstract

“…Thus there would be no solar radiation reaching the earth atmosphere if the photosphere is totally obscured. However it is well known that some of the solar soft‐X‐ray and EUV radiation which originates from the solar corona is not obscured during a solar eclipse [ Rishbeth , 1968; Marriott et al , 1972; Davis et al , 2000, 2001; Curto et al , 2006]. Davis et al [2000] presented a method for the first time to estimate the percentage of the solar ionizing radiation which remains unobscured during the eclipse by comparing the variation of the ionospheric E‐layer with the observed behaviors during a control day and found that the flux of solar ionizing radiation fell to a minimum of 25 ± 2% of the value before and after the eclipse for the 11 August 1999 eclipse.…”

Section: Solar Radiation During An Eclipsementioning

confidence: 99%

The midlatitude F2 layer during solar eclipses: Observations and modeling

Liu

Yue

et al. 2008

J. Geophys. Res.

View full text Add to dashboard Cite

[1] We conducted a statistical analysis on the changes in foF2 during seven eclipse events on the basis of the data derived from 23 ionosonde stations. To model eclipse effects on the ionosphere, we constructed a solar spectrum model for solar eclipses. The background hmF2, local time, solar cycle, and dip angle effects on the ionospheric response to solar eclipses are investigated in the four controlled case studies. Both the measurements and simulations show that the eclipse effect is larger in the midday than in the morning and afternoon and that larger dip angle results in smaller eclipse effect. Furthermore, the simulated results show that the local time effect is actually due to the neutral concentration effect. Compared to at low solar activity, the eclipse effect in the F2 region is larger at high solar activity. This solar cycle effect is caused by the differences not only in the solar radiation but also in the background neutral gas concentration. In addition, an eclipse will produce a smaller change in NmF2 if the hmF2 is higher. In conclusion, the central finding of this paper is that most of the observed differences in the behavior of NmF2 during eclipses can be attributed to the differences in O + loss rate brought about by the background differences in the neutral molecular densities. The solar zenith angle, local time, and dip angle effects should be explained from this starting point.

show abstract

“…The occurrence of a solar eclipse provides the opportunity to study the response of the Earth's ionized atmosphere to large, but short-lived, changes in the solar input. Previous eclipse studies have been used to determine production and recombination rate coefficients in the E and F1 regions [Ratcliffe, 1956;Minnis, 1958;Marriott et al, 1972], while the anomalous electron density behavior near the F2 peak observed during early eclipse studies highlighted the importance of transport effects above these altitudes [Ratcliffe and Weekes, 1960]. Other eclipse studies have been used to map the sources of ionizing radiation on the Sun [Minnis, 1958;Rishbeth, 1968;Horvarth and Theon, 1972;Brace et al, 1972].…”

Section: Introductionmentioning

confidence: 99%

Measurements of the topside ionosphere over Arecibo during the total solar eclipse of February 26, 1998

MacPherson¹,

González²,

Sulzer³

et al. 2000

J. Geophys. Res.

View full text Add to dashboard Cite

Abstract. The Arecibo incoherent scatter radar facility was operated on February 26, 1998, and was used to observe the total solar eclipse that occurred over the Caribbean. A maximum of 87% obscuration was observed over Arecibo at 1430 LT (1830 UT). The radar was operated using an experimental technique, which uses a 300/•s single/multi-frequency pulse, to gather data from the altitude range 146-2412 km. The Sheffield University plasmasphere ionosphere model was used to interpret the measurements. The electron temperature was found to have decreased by 600 K at 400 km altitude, but the magnitude of the decrease becomes smaller with increasing altitude. This is shown to be the result of the lesser degree of obscuration of the solar disk at latitudes north of Arecibo. Conjugate point photoelectron heating effects are also shown to play a significant role in the electron energy balance during the eclipse. The H + ion temperature exhibited a response to the eclipse, with

show abstract

Ionospheric effects of two recent solar eclipses

Cited by 17 publications

References 10 publications

The study of the effect of solar eclipses on the ionosphere based on satellite beacon observations

The study of the effect of solar eclipses on the ionosphere based on satellite beacon observations

The midlatitude F2 layer during solar eclipses: Observations and modeling

Measurements of the topside ionosphere over Arecibo during the total solar eclipse of February 26, 1998

Contact Info

Product

Resources

About