scispace - formally typeset
Search or ask a question
Topic

Very low frequency

About: Very low frequency is a research topic. Over the lifetime, 1540 publications have been published within this topic receiving 24233 citations. The topic is also known as: VLF.


Papers
More filters
Journal ArticleDOI
TL;DR: In this paper, the authors used very low frequency (VLF) transmission from a very low-frequency (VTX, 18.2 kHz) received at a low latitude station Suva, Fiji over a Transmitter-Receiver Great Circle Path (TRGCP) length of 11,400 km to identify any possible ionospheric perturbations associated with the earthquakes that occurred in the Indonesia region during the period December 2006-October 2010.

15 citations

Patent
05 Aug 2008
TL;DR: In this article, the authors proposed a method for signal processing and transmission based on detecting simultaneous operation of a radio transmitter of a wireless communication device within a first predefined frequency band and a radio receiver of the wireless communication devices within a second predefined radio band.
Abstract: A method, wireless communication device (402) and base station (502) for signal processing and transmission is provided. The method includes detecting (604) simultaneous operation of a radio transmitter of the wireless communication device within a first predefined frequency band and a radio receiver of the wireless communication device within a second predefined frequency band. Further, the method includes reducing (606), based on the detecting, a bandwidth of an operating signal of the radio transmitter from a standard bandwidth value to a reduced bandwidth value. The bandwidth is reduced based on a bandwidth reduction factor. Furthermore, the method includes transmitting (608) the operating signal within the first predefined frequency band from the radio transmitter.

14 citations

Journal ArticleDOI
TL;DR: The radio emissions in the frequency range of 2 to 3 kHz have been observed in the distant heliosphere by the Voyager 1 and 2 plasma wave instruments as discussed by the authors, and the radio emission was first observed in 1982 and has been present almost continuously since 1983.

14 citations

Journal ArticleDOI
TL;DR: This letter presents the first assessment of a newly developed polarity retrieval scheme augmenting a very low frequency (VLF) long-range lightning detection network (named ZEUS) that uses extremely lowfrequency (ELF) in conjunction with the VLF waveform.
Abstract: This letter presents the first assessment of a newly developed polarity retrieval scheme augmenting a very low frequency (VLF) long-range lightning detection network (named ZEUS). The polarity scheme uses extremely low frequency (ELF) in conjunction with the VLF waveform. The measured ELF signal is compared with the simulated ELF signal to extract the polarity sign. This comparison also produces correlation coefficients that are used to assign four confidence index categories on the polarity sign. This letter presents polarity results for a period of ZEUS network operation from November 26 to December 15, 2004. Assessment of the polarity measurements is conducted through comparisons against the Brazilian lightning network Rede Integrada Nacional de Detecccedilatildeo de Descargas Atmosfeacutericas (RINDAT) that uses a well-established lightning location technology. Contingency test analysis shows that algorithm performance is consistent with the assigned confidence level, e.g., at medium confidence level, the algorithm has a 5% bias, whereas at high level, perfect agreement is shown with RINDAT. Peak current strength was found not to influence the accuracy of the polarity retrieval

14 citations

Journal ArticleDOI
TL;DR: In this article, the cyclotron resonance interaction of a packet of finite amplitude "whistler" mode waves, travelling in the direction of the ambient magnetic field, with a collection of high energy electrons spiralling along the field is examined.

14 citations


Network Information
Related Topics (5)
Electric field
87.1K papers, 1.4M citations
78% related
Wave propagation
55K papers, 1.1M citations
76% related
Magnetic field
167.5K papers, 2.3M citations
76% related
Radar
91.6K papers, 1M citations
75% related
Plasma
89.6K papers, 1.3M citations
74% related
Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202320
202232
202156
202048
201942
201852