ionospheric effects on the f region during the sunrise for the annular solar eclipse over taiwan on 21 may 2012
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2013
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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 foF2, hmF2, bottomside scale height around the
peak height (Hm), and slab thickness (B0) 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 foF2
values gradually decreased when the annularity began and reached a minimum
level of approximately 2.0 MHz at 06:30 LT. The hmF2
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 F2 layer peak height
(Hm) 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.
| Reference Key |
chuo2013annalesionospheric
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|---|---|
| Authors | ;Y. J. Chuo |
| Journal | journal of food measurement and characterization |
| Year | 2013 |
| DOI |
10.5194/angeo-31-1891-2013
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| URL | |
| Keywords |
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