Solar eclipse effects of 22 July 2009 on Sporadic-E

Chen, G.; Zhao, Zhengyu; Zhou, Chen; Yang, Guobin; Zhang, Y.

doi:10.5194/angeo-28-353-2010

Cited by 23 publications

(9 citation statements)

References 17 publications

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“…A solar eclipse provides us with an excellent and rare opportunity to monitor the changes in the ionosphere associated with the sudden solar radiation variations during the solar eclipse. There are good number of ionospheric observations during solar eclipses mainly dedicated to E and F regions of the ionosphere (above altitude of 100 km) through rocket, radar and ionosonde techniques [ Minnis , 1952; Accordo et al , 1972; Farges et al , 2001; Chandra et al , 2007; Le et al , 2008a, 2008b; Patra et al , 2009; Chen et al , 2010]. D‐region is the lowest part of ionosphere ranging from ∼60–75 km in the daytime and ∼75–95 km in the nighttime [ Hargreaves , 1992].…”

Section: Introductionmentioning

confidence: 99%

D-region ionosphere response to the total solar eclipse of 22 July 2009 deduced from ELF-VLF tweek observations in the Indian sector

Singh

Veenadhari²,

Maurya³

et al. 2011

J. Geophys. Res.

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[1] Observations of tweeks with higher harmonics (n > 1) at low latitude stations Allahabad and Nainital, in the Indian sector, during the total solar eclipse on 22 July 2009, are presented. Allahabad and Nainital stations were in 100% and 85% of the totality paths. Observations suggest that about 30-40% obscuration of solar disc can lead to the tweeks occurrence which otherwise occur only in nighttime. A total of 148 tweeks at Allahabad and 20 tweeks at Nainital were recorded with some of them up to 3rd harmonics. The World Wide Lightning Location Network data indicated that tweeks observed were generated by lightning's located in the partial eclipse area of Asia-Oceania region. The changes in D-region ionospheric VLF reflection height and electron density (∼22-23 cm −3 ) during eclipse have been estimated from the first cut-off frequency of the tweeks. The reflection height increased from ∼89 km from the first occurrence of tweek to about 91-92 km at the totality and then decreased to ∼87 km at the end of the eclipse, suggesting a change of about 5 km in the reflection height during eclipse. The reflection heights are lower by 2-3 km as compared to normal nighttime tweek reflection heights. The above increase in the reflection height indicate that the partial nighttime condition is created during eclipse, as the main D-region ionizing radiation Lyman a is blocked but solar soft X-ray and EUV radiations originating from the limb solar corona are not totally blocked which produce some of ionization in the D-region.

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Section: Introductionmentioning

confidence: 99%

D-region ionosphere response to the total solar eclipse of 22 July 2009 deduced from ELF-VLF tweek observations in the Indian sector

Singh

Veenadhari²,

Maurya³

et al. 2011

J. Geophys. Res.

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“…In 2010, the Universal Serial Bus (USB) and high-performance field programmable gate arrays (FPGA) were applied in the new system. The previous radio systems in the WIOBSS family were all single-channel systems, which were applied to observe the ionospheric E-layer, F-layer, and E-region field-aligned irregularities [ 13 , 14 ]. They have the ability to measure the echo amplitude, range, and Doppler shift [ 15 , 16 ], and are used to investigate electron density variations and travelling ionospheric disturbances [ 17 , 18 ].…”

Section: Introductionmentioning

confidence: 99%

Design and Application of Wuhan Ionospheric Oblique Backscattering Sounding System with the Addition of an Antenna Array (WIOBSS-AA)

Cui

Chen

Wang

et al. 2016

Sensors

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The Wuhan Ionospheric Oblique Backscattering Sounding System with the addition of an antenna array (WIOBSS-AA) is the newest member of the WIOBSS family. It is a multi-channel radio system using phased-array antenna technology. The transmitting part of this radio system applies an array composed of five log-periodic antennas to form five beams that span an area to the northwest of the radar site. The hardware and the antenna array of the first multi-channel ionosonde in the WIOBSS family are introduced in detail in this paper. An ionospheric detection experiment was carried out in Chongyang, Hubei province, China on 16 March 2015 to examine the performance of WIOBSS-AA. The radio system demonstrated its ability to obtain ionospheric electron density information over a wide area. The observations indicate that during the experiment, the monitored large-area ionospheric F2-layer was calm and electron density increased with decreasing latitude.

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“…The structure and the related winds and wind shears for the formation of at magnetic equator (Thumba, dip 2 ∘ N) were studied in detail by [Sridharan et al, 1989]. [Chen et al, 2010] described the observations of sporadic ( ) layer behavior over east China during the total solar eclipse. Sequential sporadic layers at low latitude in the Indian sector were presented by [Jayachandran et al, 1999] by comparing (Waltair, dip 20 ∘ ) with (Thumba, dip 2 ∘ N) and (SHAR dip 10 ∘ ).…”

Section: Introductionmentioning

confidence: 99%

Ionospheric response to annular and partial solar eclipse of 29 April 2014 in Antarctica and Australian Regions

Atulkar¹,

Parvaiz²,

Jeevakhan³

et al. 2015

Russ. J. Earth Sci.

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An annular and partial solar eclipse was observed on 29 April 2014 over Australian and Antarctic regions. In this study we have analyzed the ionospheric response of this solar eclipse event. We have done a comprehensive study to find out the changes that occurred in various ionospheric parameters during the solar eclipse event over Australia and Antarctic region. We selected four Australian stations Brisbane (27.5 ∘ S, 152.9 ∘ E), Canberra (35.3 ∘ S, 149.1 ∘ E), Hobart (42.9 ∘ S, 147.3 ∘ E) and Perth (31.955 ∘ S, 115.859 ∘ E) as well as one Antarctic station Mawson (70.6455 ∘ S, 131.2573 ∘ E). We have studied the changes in the and ionospheric layers using the ground based observations at these stations. From our analysis we found that there occurred a decrease in the critical frequencies of sporadic () and (2) layers during the time eclipse was in progress at all the four Australian stations while as at Antarctic the value of 2 recorded an enhancement. At the same time an increase in the corresponding heights of these layers (ℎ ′ , ℎ ′ 2) was also observed.

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Solar eclipse effects of 22 July 2009 on Sporadic-E

Cited by 23 publications

References 17 publications

D-region ionosphere response to the total solar eclipse of 22 July 2009 deduced from ELF-VLF tweek observations in the Indian sector

D-region ionosphere response to the total solar eclipse of 22 July 2009 deduced from ELF-VLF tweek observations in the Indian sector

Design and Application of Wuhan Ionospheric Oblique Backscattering Sounding System with the Addition of an Antenna Array (WIOBSS-AA)

Ionospheric response to annular and partial solar eclipse of 29 April 2014 in Antarctica and Australian Regions

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