First observations of low latitude whistlers using WHU ELF/VLF receiver system

作者：Chen, YanPing; Ni, BinBin^*; Gu, XuDong; Zhao, ZhengYu; Yang, GuoBin; Zhou, Chen; Zhang, YuanNong

来源：Science China Technological Sciences, 2017, 60(1): 166-174.

DOI：10.1007/s11431-016-6103-5

• WHU ELF/VLF receiver
• whistlers
• dispersion
• duct mode

The recently developed high-quality WHU ELF/VLF receiver system has been deployed in Suizhou, China (geomagnetic latitude 21.81A degrees N, longitude 174.44A degrees E, L=1.16) to detect low latitude extremely-low-frequency (ELF: 0.3aEuro'3 kHz) and very-low-frequency (VLF: 3aEuro'30 kHz) emissions originating from either natural or artificial sources since February 2016. During the first-month operation of the receiver system, a total of 3039 clear whistlers have been recorded at this low latitude station with the majority (97.0%) occurring on 28 February and 1 March 2016. Observed whistlers manifest various types including single one-hop, echo train, multi-flash, and multi-path. They tend to intensify after local midnight, reach the peak around 04aEuro'05 LT, and then weaken quickly. Both features of lower cutoff frequencies of most whistlers below similar to 1.6 kHz and almost uniform dispersion for many successive multi-flash whistlers suggest that these whistlers propagate along the geomagnetic field lines in the duct mode. The computed dispersion varies between similar to 15 s(1/2) and 23 s(1/2) for observed one-hop whistlers and is greater than 50 s(1/2) for three-hop echo train whistlers, indicating that the whistlers observed at the Suizhou station are low latitude whistlers.

• 出版日期2017-1
• 单位武汉大学