The Influence of Solar Flare on Low Frequency Time-Code Timing Signal

2018 ◽  
Author(s):  
Xin Wang ◽  
Ping Feng ◽  
Jingya Chen ◽  
Xiaohui Li
Keyword(s):  
Solar Flare ◽  
Low Frequency ◽  
Time Code ◽  
Code Timing

Experimental Study on Low Frequency Time-Code Timing Signal Propagation in Forest Environment

2021 ◽  
Vol 55 (S1) ◽  
pp. 65-76
Author(s):  
Xin Wang ◽  
Luxi Huang ◽  
Shuanglin Li ◽  
Yingming Chen ◽  
Fan Zhao ◽  
...  
Keyword(s):  
Experimental Study ◽  
Low Frequency ◽  
Signal Propagation ◽  
Time Code ◽  
Forest Environment ◽  
Code Timing

scholarly journals Variation of Low-Frequency Time-Code Signal Field Strength during the Annular Solar Eclipse on 21 June 2020: Observation and Analysis

Sensors ◽  
2021 ◽  
Vol 21 (4) ◽  
pp. 1216
Author(s):  
Xin Wang ◽  
Bo Li ◽  
Fan Zhao ◽  
Xinyu Luo ◽  
Luxi Huang ◽  
...  
Keyword(s):  
Field Strength ◽  
Solar Eclipse ◽  
Low Frequency ◽  
Signal Propagation ◽  
Normal Operation ◽  
Time Code ◽  
Long Distance ◽  
Time Service ◽  
Annular Solar Eclipse ◽  
Signal Field

Due to the occlusion of the moon, an annular solar eclipse will have an effect on the ionosphere above the earth. The change of the ionosphere, for the low-frequency time-code signal that relies on it as a reflection medium for long-distance propagation, the signal field strength, and other parameters will also produce corresponding changes, which will affect the normal operation of the low-frequency time-code time service system. This paper selects the solar eclipse that occurred in China on 21 June 2020, and uses the existing measurement equipment to carry out experimental research on the low-frequency time-code signal. We measured and analyzed the signal field strength from 20 June 2020 to 23 June 2020, and combined solar activity data, ionospheric data, and geomagnetic data, and attempted to explore the reasons and rules of the change of signal parameters. The results showed that the field strength of the low-frequency time-code signal changed dramatically within a short time period, the max growth value can reach up to 17 dBμV/m and the variation trend yielded ‘three mutations’. This change in signal field strength is probably due to the occurrence of a solar eclipse that has an effect on the ionosphere. When the signal propagation conditions change, the signal strength will also change accordingly.

scholarly journals Characterization of Selected Solar Radio Bursts Based on Solar Activity Detected by e-CALLISTO (Malaysia)

2014 ◽  
Vol 32 ◽  
pp. 144-154
Author(s):  
Zety Sharizat Hamidi ◽  
N.N.M. Shariff ◽  
C. Monstein
Keyword(s):  
Solar Flare ◽  
Coronal Mass Ejections ◽  
Solar Radio ◽  
Low Frequency ◽  
Weather Condition ◽  
Impulsive Phase ◽  
Primary Energy ◽  
Radio Bursts ◽  
Solar Radio Bursts ◽  
Solar Burst

One of the main reasons to study more about the dynamics of solar radio bursts is because solar these bursts can interfere with the Global Positioning System (GPS) and communications systems. More importantly, these bursts are a key to understand the space weather condition. Recent work on the interpretation of the low frequency region of a main solar burst is discussed. Continuum radio bursts are often related to the solar activities such as an indication of the formation of sunspot, impulsive phase of solar flares and Coronal Mass Ejections (CMEs) and their frequencies correspond to the densities supposed to exist in the primary energy release volume. Specifically, solar burst in low frequency play an important role in interpretation of Sun activities. In this work, we have selected few solar bursts that successfully detected by our station at the National Space Centre, Banting Selangor. Our objective is to correlate the solar burst with Sun activities by looking at the main sources that responsibility with the trigger of solar burst. It is found that type II burst is dominant with Coronal Mass Ejections (CMEs), type III burst associated with solar flare, IV burst with the formation of active region and type U burst high solar flare. We believed that this work is a good start to monitor Sun’s activities in Malaysia as equatorial country.

Low frequency time-code time service method based on frequency sharing

2013 ◽  
Author(s):  
Ping Feng ◽  
Zhiyong Zhang ◽  
Guichen Wu ◽  
Yan Bai ◽  
Xiaofeng Ding
Keyword(s):  
Low Frequency ◽  
Time Code ◽  
Time Service

scholarly journals Development of a Radio Telescope for Very Low Frequency Observations

2020 ◽  
Vol 240 ◽  
pp. 07004
Author(s):  
Arpit Gupta ◽  
Seow Kit Hint ◽  
Cao Shangyu ◽  
Hoe Teck Tan
Keyword(s):  
Data Collection ◽  
Solar Flare ◽  
Radio Telescope ◽  
Background Noise ◽  
Ionospheric Disturbance ◽  
Low Frequency ◽  
Ionospheric Disturbances ◽  
X Ray ◽  
Very Low Frequency ◽  
Solar Storm

Sudden ionospheric disturbances are transient changes in the ionosphere caused by enhancement in X-ray and EUV fluxes during solar flare events. The Solar Storm Radio Telescope is developed to detect Very Low Frequency (VLF) signals with frequency between 3-30 kHz transmitted from various VLF stations around the Globe. We will also be investigating different methods to reduce the background noise in the data collection. This will help to ensure an accurate hit when there is a sudden ionospheric disturbance.

scholarly journals Fundamental and Second Harmonic Bands of Solar Radio Burst Type II Caused by X1.8 - Class Solar Flares

2014 ◽  
Vol 33 ◽  
pp. 208-217 ◽  
Author(s):  
Zety Sharizat Hamidi ◽  
N.N.M. Shariff ◽  
C. Monstein
Keyword(s):  
Solar Flare ◽  
Solar Flares ◽  
Drift Rate ◽  
Second Harmonic ◽  
Low Cost ◽  
Low Frequency ◽  
Electromagnetic Spectrum ◽  
Driving Mechanism ◽  
Type Ii ◽  
Flare Event

An extreme 2012 October 23 solar flare event marked on the onset of the CALLISTO data, being one of the highest solar flare event that successfully detected. The formation of harmonic solar burst type II in meter region and their associated with X1.8-class solar flares has been reported. This burst has been observed at the National Space Centre, Banting, detected by the Compound Astronomical Low-cost Low-frequency Instrument for Spectroscopy and Transportable Observatory (CALLISTO) system in the range of 150-400 MHz in the low frequency band. It occurred between 3.17:45 UT to 3.19:00 UT within 1 minute 15 seconds. The Compound Astronomical Low-cost Low-frequency Instrument for Spectroscopy and Transportable Observatory CALLISTO spectrometer is a solar dedicated spectrometer system that has been installed all over the world to monitor the Sun activity in 24 hours. The growth of this burst is often accompanied by abundance enhancement of particles which may take the form of multiple independent drifting bands or other forms of fine structure. Due to the results, the drift rate of this burst is 2.116 MHz s–1, which is considered as a slow drift rate. These drifting bands are approximately having a frequency ratio 2:1. This burst is a particular interest, though of sporadic and infrequent occurrence. The splitting is due to the effect of magnetic splitting, analogous to the Zeeman Effect. This is one of the examples which the type II burst is not always associated with CMEs event. The combination of radio and x-ray region give a complete view of the solar flare eruption from e active region AR1598. Both different electromagnetic spectrum shows the exact time. Other interesting results is that this type II burst is not associated with CMEs as usual, but due to the very high solar flare event with a fundamental form at more than 100 MHz. An extension of the present work will be a detailed study of the possible triggering and the driving mechanism of solar flare explosion.

scholarly journals Mid-latitude ionospheric signature of a weak solar flare in winter

2013 ◽  
Vol 109 (1/2) ◽  
Author(s):  
Etienne J. Koen ◽  
Andrew B. Collier
Keyword(s):  
Wave Propagation ◽  
Solar Flare ◽  
Low Frequency ◽  
Moderate Intensity ◽  
X Ray ◽  
Very Low Frequency ◽  
Ionospheric Effects ◽  
Long Wave

Measurements of the amplitude and phase of very low frequency transmitter signals were used to evaluate the effects on the ionosphere of a moderate intensity solar flare that occurred on 13 December 2007. These measurements were compared to modelled results from the Long Wave Propagation Capability code. The ionospheric effects were found to be delayed by ~1 min with respect to the 0.1–0.8 nm solar X-ray flux.

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