Bow and stern waves triggered by the Moon's shadow boat

Liu, J. Y.; Sun, Yihe; Kakinami, Yoshihiro; Chen, Chia-Hung; Lin, Charles; Tsai, Ho‐Fang

doi:10.1029/2011gl048805

Cited by 41 publications

(62 citation statements)

References 21 publications

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“…As shown in Figures , the initial CIDs propagated asymmetrically to the north and west‐southwest from the tsunami source area. To investigate the difference in the TEC oscillation, the Hilbert‐Huang transform (HHT) [ Huang and Wu , ; Wu et al ., ; Liu et al ., ] was applied to the TEC variation, and spectra were calculated. Chen et al .…”

Section: Discussionmentioning

confidence: 99%

Ionospheric ripples excited by superimposed wave fronts associated with Rayleigh waves in the thermosphere

et al. 2013

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[1] Coseismic ionospheric disturbances (CIDs) associated with the 2011 Tohoku earthquake off the Pacific coast (M w 9.0, Tohoku EQ) were examined using total electron content and seismic wave data. A faster CID propagated at~3.0 km/s only in the west-southwest, while a slower CID propagated concentrically at 1.2 km/s or slower from the tsunami source area. Taking the propagation speed and oscillation cycle into account, the faster CID was associated with a Rayleigh wave, but the slower CID was associated with an acoustic or gravity wave. The north-south asymmetry of the CID associated with the Rayleigh wave suggests that the Rayleigh wave did not act as a point source of the acoustic wave because a point source propagating in all directions must produce symmetric CID in all directions. Therefore, a superimposed wave front of acoustic waves was excited by the Rayleigh wave and produced the north-south asymmetry of the faster CID due to the magnetic inclination effect, which is different from a well-known north-south asymmetry of CID excited at the epicenter. On the other hand, above and south of the tsunami source area, the CID with a period of 4 min was excited by a point source located at the tsunami source area because atmospheric waves propagating from a point source produce north-south asymmetry in the resulting CID.

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Section: Discussionmentioning

confidence: 99%

Ionospheric ripples excited by superimposed wave fronts associated with Rayleigh waves in the thermosphere

et al. 2013

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“…Another phenomenon, an atmospheric gravity wave (AGW), can be generated by the shadow of the Moon during the eclipse (Chimonas and Hines, 1970;Chimonas, 1970;Cohen, 1984;Cheng et al, 1992;Liu et al, 2011). A bow wave can be produced by the supersonic motion of the shadow of the Moon through the atmosphere along the eclipse path.…”

Section: Resultsmentioning

confidence: 99%

Ionospheric effects on the F region during the sunrise for the annular solar eclipse over Taiwan on 21 May 2012

Chuo

2013

Ann. Geophys.

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Abstract. On 21 May 2012 (20:56, Universal Time; UT, on 20 May), an annular solar eclipse occurred, beginning at sunrise over southeast China and moving through Japan, sweeping across the northern Pacific Ocean, and completing its passage over the western United States at sunset on 20 May 2012 (02:49 UT, 21 May). We investigated the eclipse area in Taiwan, using an ionosonde and global positioning system (GPS) satellite measurements. The measurements of foF 2 , hmF 2 , bottomside scale height around the peak height (H m ), and slab thickness (B 0 ) were collected at the ionosonde station at Chung-Li Observatory. In addition, we calculated the total electron content (TEC) to study the differences inside and outside the eclipse area, using 3 receivers located at Marzhu (denoted as MATZ), Hsinchu (TNML), and Henchun (HENC). The results showed that the foF 2 values gradually decreased when the annularity began and reached a minimum level of approximately 2.0 MHz at 06:30 LT. The hmF 2 immediately decreased and then increased during the annular eclipse period. The TEC variations also appeared to deplete in the path of the eclipse and opposite the outside passing area. Further, the rate of change of the TEC values (dTEC / dt measured for 15 min) was examined to study the wave-like fluctuations. The scale height near the F 2 layer peak height (H m ) also decreased and then increased during the eclipse period. To address the effects of the annular eclipse in the topside and bottomside ionosphere, this study provides a discussion of the variations between the topside and bottomside ionospheric parameters during the eclipse period.

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“…Four instruments observe clear eclipse signatures, including total electron content (TEC) derived from measurements of local ground‐based GPS (Global Positioning System) receivers, ionograms recorded by a local ionosonde, Doppler frequency shifts (DFSs) probed by Doppler sounding system with a sounding frequency of 5.26 MHz, and the echo amplitude of very low frequency (VLF) receivers at 22.2 kHz, in the whole ionosphere over Taiwan. Although ionograms recorded by ionosondes (Liu et al, ; Tsai & Liu, ; Yeh et al, ) and TEC derived by ground‐based receivers (Lin et al, ; Liu et al, , ; Sun et al, ; Tsai & Liu, ) were individually employed to study ionospheric solar eclipse effects, multiinstrument observations have not yet been conducted over Taiwan. In fact, this should be one of the most comprehensive multiobservations studying the annular solar eclipse effects at various altitudes of the ionosphere over Taiwan.…”

Section: Introductionmentioning

confidence: 99%

Ionospheric Response to the 21 May 2012 Annular Solar Eclipse Over Taiwan

et al. 2019

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An annular solar eclipse swept over Taiwan in the early morning on 21 May 2012. This provides an excellent opportunity to study ionospheric response to the solar eclipse mainly due to photochemical effects. Local ground‐based Global Positioning System receivers, an ionosonde, high frequency‐continue wave Doppler sounding systems, and very low frequency receivers are used to observe ionospheric eclipse signatures. These multiinstrument observations show that the extreme total electron content (TEC) depression lags the maximum obscuration by about 5–20 min, while the Doppler frequency shift decreases and increases (i.e., the ionosphere ascends and descends) during first contact‐maximum obscuration and maximum obscuration‐last contact, respectively. The ionosonde data well agree with the TEC and Doppler frequency shift observations. The results show that the extreme TEC depression lag (i.e., delay time) being inversely proportional to the associated maximum obscuration confirms that the photochemical process is essential in Taiwan during the 21 May 2012 annular solar eclipse. A theoretical derivation is proposed for the first time to explain the delay time due to pure photochemical process during solar eclipses.

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Bow and stern waves triggered by the Moon's shadow boat

Cited by 41 publications

References 21 publications

Ionospheric ripples excited by superimposed wave fronts associated with Rayleigh waves in the thermosphere

Ionospheric ripples excited by superimposed wave fronts associated with Rayleigh waves in the thermosphere

Ionospheric effects on the F region during the sunrise for the annular solar eclipse over Taiwan on 21 May 2012

Ionospheric Response to the 21 May 2012 Annular Solar Eclipse Over Taiwan

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