[논문]Characteristics of the E- and F-region field-aligned irregularities in middle latitudes: Initial results obtained from the Daejeon 40.8 MHz VHF radar in South Korea

Kwak, Young-Sil; Yang, Tae-Yong; Kil, Hoysub; Phanikumar, Devulapalli Venkata; Heo, Bok-Haeng; Lee, Jae-Jin; Hwang, Junga; Choi, Seong-Hwan; Park, Young-Deuk; Choi, Ho-Seong

doi:10.5140/jass.2014.31.1.15

Characteristics of the E- and F-region field-aligned irregularities in middle latitudes: Initial results obtained from the Daejeon 40.8 MHz VHF radar in South Korea 원문보기

Journal of astronomy and space sciences, v.31 no.1, 2014년, pp.15 - 23

Kwak, Young-Sil (Division of Space Science, Korea Astronomy and Space Science Institute) , Yang, Tae-Yong (Division of Space Science, Korea Astronomy and Space Science Institute) , Kil, Hoysub (Space Department, The Johns Hopkins University Applied Physics Laboratory) , Phanikumar, Devulapalli Venkata (Aryabhatta Research Institute of Observational Sciences (ARIES)) , Heo, Bok-Haeng (Korea Meteorological Administration) , Lee, Jae-Jin (Division of Space Science, Korea Astronomy and Space Science Institute) , Hwang, Junga (Division of Space Science, Korea Astronomy and Space Science Institute) , Choi, Seong-Hwan (Division of Space Science, Korea Astronomy and Space Science Institute) , Park, Young-Deuk (Division of Space Science, Korea Astronomy and Space Science Institute) , Choi, Ho-Seong (Republic of Korea Air Force)

Abstract ▼ AI-Helper

We present preliminary observations of the field-aligned-irregularities (FAIs) in the E and F regions during the solar minimum (2009 - 2010) using the 40.8 MHz coherent backscatter radar at Daejeon ($36.18^{\circ}N$, $127.14^{\circ}E$, $26.7^{\circ}N$ dip latitude) in South Korea. The radar, which consists of 24 Yagi antennas, observes the FAIs using a single beam with a peak power of 24 kW. The radar has been continuously operated since December 2009. Depending on the manner of occurrence of the backscatter echoes, the E-region echoes are largely divided into two types: quasi-periodic (QP) and continuous echoes. Our observations show that the QP echoes occur frequently above an altitude of 105 km in the post-sunset period and continuous echoes occur preferentially around an altitude of 105 km in the post-sunrise period. QP echoes appear as striated discrete echoes for a period of about 10 - 20 min. The QP-type echoes occur more frequently than the continuous-type echoes do and the echo intensity of the QP type is stronger than that of the continuous type. In the F region, the FAIs occur at night at an altitude interval of 250 - 450 km. As time proceeds, the occurrence height of the FAIs gradually increases until early in the morning and then decreases. The duration of the F-region FAIs is typically a few hours at night, although, in rare cases, FAIs persist throughout the night or appear even after sunrise. We discuss the similarities and differences of the FAIs observed by the Daejeon radar in comparison with other radar observations.

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가설 설정

The Daejeon VHF radar was developed and installed with the support of the “Development of Korean Space Weather Center”, a project of the KASI. H. Kil acknowledges support from National Science Foundation Aeronomy program (AGS-1237276). We are grateful for the helpful advice offered by D.

제안 방법

In this paper, we introduce initial observations of E- and F-region FAIs during the solar minimum (2009-2010) using the 40.8 MHz coherent backscatter radar at Daejeon (36.18°N, 127.14°E, 26.7°N dip latitude) in South Korea.

성능/효과

2005) were conducted at Kyushu in Japan to investigate the relationship between QP echoes and Es layers. The campaign results showed that polarization electric fields and QP echoes were induced in association with the Es layer. In addition, the whole set of E-region structures were seen to be controlled by polarization electric fields mapped upward along geomagnetic field lines.

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