A cyclotron resonance mechanism for very‐low‐frequency whistler‐mode sideband wave radiation. I. Introduction and description of external resonances

1989 ◽  
Vol 66 (8) ◽  
pp. 3482-3494 ◽  
Author(s):  
L. A. D. Sá
Keyword(s):  
Cyclotron Resonance ◽  
Low Frequency ◽  
Wave Radiation ◽  
Resonance Mechanism ◽  
Whistler Mode ◽  
Very Low Frequency

Absorption of very low frequency (VLF) waves in the whistler mode propagation in Jovian ionosphere

1992 ◽  
Vol 58 (2) ◽  
pp. 115-125 ◽  
Author(s):  
M. M. Ahmad ◽  
Altaf Ahmad ◽  
Lalmani
Keyword(s):  
Low Frequency ◽  
Mode Propagation ◽  
Whistler Mode ◽  
Very Low Frequency ◽  
Vlf Waves

Very low frequency emission periods and whistler-mode group delays

1964 ◽  
Vol 69 (21) ◽  
pp. 4704-4708 ◽  
Author(s):  
R. A. Helliwell ◽  
N. Brice
Keyword(s):  
Low Frequency ◽  
Whistler Mode ◽  
Very Low Frequency ◽  
Mode Group ◽  
Group Delays ◽  
Frequency Emission

scholarly journals Absorption of Very Low Frequency Waves in the Whistler Mode Propagation at Low Latitudes

1967 ◽  
Vol 19 (2) ◽  
pp. 81-89 ◽  
Author(s):  
V. V. SOMAYAJULU ◽  
B. A. P. TANTRY
Keyword(s):  
Low Frequency ◽  
Mode Propagation ◽  
Whistler Mode ◽  
Very Low Frequency ◽  
Low Latitudes ◽  
Low Frequency Waves

Observation of very-low-frequency whistler-mode waves in the region of the radiation-belt slot

1972 ◽  
Vol 77 (19) ◽  
pp. 3475-3482 ◽  
Author(s):  
H. C. Koons ◽  
D. A. McPherson
Keyword(s):  
Radiation Belt ◽  
Low Frequency ◽  
Whistler Mode ◽  
Very Low Frequency ◽  
Whistler Mode Waves

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.

Evaluation Method for Magnetic Shield Material using Incremental Permeability against Very Low Frequency Micro Magnetic Field Fluctuation

2020 ◽  
Vol 140 (6) ◽  
pp. 331-337
Author(s):  
Mitsuru Sakakibara ◽  
Satoru Muto ◽  
Manabu Okuda ◽  
Yoshiaki Adachi ◽  
Gen Uehara
Keyword(s):  
Magnetic Field ◽  
Evaluation Method ◽  
Low Frequency ◽  
Field Fluctuation ◽  
Magnetic Shield ◽  
Magnetic Field Fluctuation ◽  
Very Low Frequency
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