scholarly journals Algorithms and results of streaming whistler recognition

2018 ◽  
Vol 62 ◽  
pp. 02001
Author(s):  
Vladimir Mochalov ◽  
Anastasia Mochalova
Keyword(s):  
Open Access ◽  
Electromagnetic Radiation ◽  
Computer Software ◽  
Low Frequency ◽  
Global Network ◽  
Station Network ◽  
Very Low Frequency ◽  
Software And Hardware ◽  
Access Data ◽  
Cosmophysical Research

Algorithms for streaming whistler recognition are offered. Different stages of algorithms are considered. The developed algorithms are used on a mini-computer software and hardware complexes for monitoring very low-frequency electromagnetic radiation at the Karymshina station in Kamchatka, on Oybenkel Geophysical Observatory of the Yu.G. Shafer Institute of Cosmophysical Research and Aeronomy (the Sakha Republic (Yakutia)), as well as recognition of whistlers is performed on the basis of open access data of abelian.org VLF station network in Todmorden United Kingdom (53,703N, 2.072W), Bielefeld Germany (52.146N, 8.458E), Cumiana Italy (44.96N, 7.42E), Warsaw Poland (52.16313N, 21.03094E), Australia Heathcote (36.804163S 144.67559E). Our whistler recognition results allowed us to establish on the days of strong whistler activity, there is an average positive correlation between the number of whistlers registered at Karymshino station in minutes of a day and the number of lightning strokes registered by WWLLN global network in minutes of a day in the coordinate rectangle LAT 25S-45S, LON 140E-160E (Australia).

scholarly journals Magnetic Field due to the Radiation of High Altitude Lightning

2020 ◽  
Vol 8 (2S12) ◽  
pp. 49-50
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Radiation ◽  
High Altitude ◽  
Low Frequency ◽  
Frequency Region ◽  
Middle Region ◽  
Very Low Frequency ◽  
Lightning Discharges ◽  
Cloud To Ground Lightning ◽  
Frequency Radiation

High altitude optical discharges generated by extreme cloud-to-ground lightning strokes, which occur in the middle region of the atmosphere known as sprites. Streamer formation in sprites has been well stated to be existing by several previous workers. These streamers are not only responsible for the initiation of sprites but also they are composed of these streamers. It causes the production of electromagnetic radiation upto or below the ELF (very low frequency) region which have been reported earlier through various research theories. Thus, we are reporting out for the formulation of the model by using an earlier model used to estimate higher frequency radiation from cloud and ground lightning discharges through these positive corona streamers. Taking it into account, other terms like radiation magnetic field has been evaluated with the studied observations.

scholarly journals Impact of earthquakes and tsunamis on the ionosphere

2019 ◽  
pp. 199-213
Author(s):  
S. L. Shalimov ◽  
A. A. Rozhnoi ◽  
M. S. Solov`eva ◽  
E. V. Ol`shanskaya
Keyword(s):  
Low Frequency ◽  
Global Network ◽  
Very Low Frequency ◽  
Complex Processes ◽  
The Earth ◽  
Navigational Systems

Fairly complex processes of lithosphere–ionosphere interactions can be explored by diagnosing the outer envelopes of the Earth with the use of global satellite navigational systems and equally global network of ground receivers and very-low-frequency transmitters. The earthquake and tsunami impacts on the ionosphere are the example of these processes. The current advances in the studies of these processes are briefly outlined.

Effect of very Low Frequency Electromagnetic Radiation on Acetylcholine Esterase Activity

2014 ◽  
Vol 1004-1005 ◽  
pp. 827-836
Author(s):  
Hong Wang ◽  
Zheng Wei Du ◽  
Pei Dong Guo ◽  
Yun Ming Tang
Keyword(s):  
Electromagnetic Field ◽  
Enzyme Activity ◽  
Electric Field ◽  
Electromagnetic Radiation ◽  
Exposure Time ◽  
Esterase Activity ◽  
Ache Activity ◽  
Electric Field Intensity ◽  
Low Frequency ◽  
Very Low Frequency

Acetylcholinesterase (AChE) is the enzyme that controls the acetylcholine (ACh) concentrations in cholinergic synaptic clefts by hydrolyzing ACh to choline and acetate. In this paper, we investigate the effect of very low frequency (VLF) electromagnetic field (EMF) radiation on AChE activity. AChE was exposed to VLF-EMFs with electric field intensity ranged from 0 to 200V/m and exposure time ranged from 0 to 120min. The results demonstrated that the VLF-EMF increased enzyme activity when the intensity ranged from 80V/m to 100V/m as well as exposure time ranged from 60min to 80min. And the AChE activity decreased when the intensity ranged from 120V/m to 140V/m and exposure time ranged from 20min to 120min. Thus, those results are significant in clinical treatments.

scholarly journals Gravity’s light in the shadow of the Moon

2018 ◽  
Vol 27 (14) ◽  
pp. 1847021
Author(s):  
Andri Gretarsson ◽  
Preston Jones ◽  
Douglas Singleton
Keyword(s):  
Gravitational Wave ◽  
Electromagnetic Radiation ◽  
Low Frequency ◽  
Core Collapse ◽  
The Moon ◽  
Very Low Frequency ◽  
Gravitational Wave Background

In this essay, we look at the possibility of vacuum production of very low frequency electromagnetic radiation from a gravitational wave background (i.e. gravity’s light). We also propose that this counterpart electromagnetic radiation should be detectable by a lunar orbiting satellite which is periodically occulted by the Moon (i.e. in the shadow of the Moon). For concreteness, we consider the possibility of detection of both the gravitational wave and hypothesized electromagnetic radiation counterpart from the supernova core collapse of Betelgeuse.

The Attenuation of Very Low Frequency Brain Oscillations in Transitions from a Rest State to Active Attention

2009 ◽  
Vol 23 (4) ◽  
pp. 191-198 ◽  
Author(s):  
Suzannah K. Helps ◽  
Samantha J. Broyd ◽  
Christopher J. James ◽  
Anke Karl ◽  
Edmund J. S. Sonuga-Barke
Keyword(s):  
Brain Activity ◽  
Sampling Rate ◽  
Low Frequency ◽  
Future Research ◽  
Adhd Symptoms ◽  
Default Mode ◽  
Very Low Frequency ◽  
Wide Range ◽  
Interference Hypothesis ◽  
Mode Interference

Background: The default mode interference hypothesis ( Sonuga-Barke & Castellanos, 2007 ) predicts (1) the attenuation of very low frequency oscillations (VLFO; e.g., .05 Hz) in brain activity within the default mode network during the transition from rest to task, and (2) that failures to attenuate in this way will lead to an increased likelihood of periodic attention lapses that are synchronized to the VLFO pattern. Here, we tested these predictions using DC-EEG recordings within and outside of a previously identified network of electrode locations hypothesized to reflect DMN activity (i.e., S3 network; Helps et al., 2008 ). Method: 24 young adults (mean age 22.3 years; 8 male), sampled to include a wide range of ADHD symptoms, took part in a study of rest to task transitions. Two conditions were compared: 5 min of rest (eyes open) and a 10-min simple 2-choice RT task with a relatively high sampling rate (ISI 1 s). DC-EEG was recorded during both conditions, and the low-frequency spectrum was decomposed and measures of the power within specific bands extracted. Results: Shift from rest to task led to an attenuation of VLFO activity within the S3 network which was inversely associated with ADHD symptoms. RT during task also showed a VLFO signature. During task there was a small but significant degree of synchronization between EEG and RT in the VLFO band. Attenuators showed a lower degree of synchrony than nonattenuators. Discussion: The results provide some initial EEG-based support for the default mode interference hypothesis and suggest that failure to attenuate VLFO in the S3 network is associated with higher synchrony between low-frequency brain activity and RT fluctuations during a simple RT task. Although significant, the effects were small and future research should employ tasks with a higher sampling rate to increase the possibility of extracting robust and stable signals.

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