Space Weather Forecast; Radio Communication Failure caused by Solar Activity

2020 ◽  
Vol 140 (2) ◽  
pp. 96-99
Author(s):  
Yûki KUBO
Keyword(s):  
Solar Activity ◽  
Space Weather ◽  
Weather Forecast ◽  
Radio Communication ◽  
Communication Failure

scholarly journals SOLAR SPECTROPOLARIMETER FOR SPACE WEATHER FORECAST

2019 ◽  
Vol 5 (4) ◽  
pp. 21-26
Author(s):  
Evgeniy Ivanov ◽  
Aleksey Gubin ◽  
Sergey Lesovoi ◽  
Ramses Zaldivar Estrada
Keyword(s):  
Solar Activity ◽  
Space Weather ◽  
Linear Polarization ◽  
Coronal Mass Ejections ◽  
Software Defined Radio ◽  
Low Cost ◽  
Weather Forecast ◽  
The Internet ◽  
Type Ii ◽  
Continuous Observation

We propose a project of the meter wavelength range solar spectropolarimeter designed for a ground-based network developing for space weather forecast. The Software-Defined Radio (SDR) solution is chosen to meet such instrument network requirements as specification identity, low cost, possibility of controlling and transmitting data remotely via the Internet. Along with these requirements, the proposed SDR solution allows us to measure Stokes I and V easily, which contrasts the proposed instrument with e-CALLISTO network spectropolarimeters, most of which can record only one linear polarization. Deployment of such instruments at various longitudes will allow continuous observation of type II bursts, often related to coronal mass ejections (CMEs) — the most geoeffective solar activity events that affect the space weather significantly.

scholarly journals SOLAR SPECTROPOLARIMETER FOR SPACE WEATHER FORECAST

2019 ◽  
Vol 5 (4) ◽  
pp. 26-33
Author(s):  
Evgeniy Ivanov ◽  
Aleksey Gubin ◽  
Sergey Lesovoi ◽  
Ramses Zaldivar Estrada
Keyword(s):  
Solar Activity ◽  
Space Weather ◽  
Linear Polarization ◽  
Coronal Mass Ejections ◽  
Software Defined Radio ◽  
Low Cost ◽  
Weather Forecast ◽  
The Internet ◽  
Type Ii ◽  
Continuous Observation

We propose a project of the meter wavelength range solar spectropolarimeter designed for a ground-based network developing for space weather forecast. The Software-Defined Radio (SDR) solution is chosen to meet such instrument network requirements as specification identity, low cost, possibility of controlling and transmitting data remotely via the Internet. Along with these requirements, the proposed SDR solution allows us to measure Stokes I and V easily, which contrasts the proposed instrument with e-CALLISTO network spectropolarimeters, most of which can record only one linear polarization. Deployment of such instruments at various longitudes will allow continuous observation of type II bursts, often related to coronal mass ejections (CMEs) — the most geoeffective solar activity events that affect the space weather significantly.

Localization of a Complex Failure by Combining ATPG and Customer-Oriented Application Testing

2013 ◽  
Author(s):  
Kai Wang ◽  
Rhys Weaver ◽  
David Johnson
Keyword(s):  
Failure Analysis ◽  
Semiconductor Device ◽  
Digital Design ◽  
Radio Communication ◽  
Communication Failure ◽  
Systemic Analysis ◽  
Rf Communication ◽  
System On A Chip ◽  
Electrical Diagnostics ◽  
Failure Location

Abstract A systemic analysis was chosen to evaluate a real case Bluetooth (BT) radio failure in the aspects of RF communication, digital design, firmware, application software, semiconductor device physics and processing, and failure analysis. This paper explores the range of testing, including customer application testing, required to confirm and localize a BT RF communication failure. It shows that the radio communication failure was not, as expected, caused by faulty radio hardware; it was rather linked to problematic encryption hardware at the assistance of the Synergy BT to mobile application. The paper also explores that the digital fault can only be detected by the timing sensitive transition fault scan patterns and how to obtain the physical failure location. Thus, the combination of ATPG and application testing provides a consistency between electrical diagnostics which yields a higher success rate at subsequent physical failure analysis of complex modern RF System on a Chip.

scholarly journals Construction of a century solar chromosphere data set for solar activity related research

2017 ◽  
Vol 3 (2) ◽  
pp. 5-8
Author(s):  
Линь Ганхуа ◽  
Lin Ganghua ◽  
Ван Сяо-Фань ◽  
Wang Xiao Fan ◽  
Ян Сяо ◽  
...  
Keyword(s):  
Data Mining ◽  
Solar Activity ◽  
Space Weather ◽  
Large Scale ◽  
Abnormal Behavior ◽  
Solar Chromosphere ◽  
Solar Cycles ◽  
Data Set ◽  
Related Research ◽  
Data Mining Algorithms

This article introduces our ongoing project “Construction of a Century Solar Chromosphere Data Set for Solar Activity Related Research”. Solar activities are the major sources of space weather that affects human lives. Some of the serious space weather consequences, for instance, include interruption of space communication and navigation, compromising the safety of astronauts and satellites, and damaging power grids. Therefore, the solar activity research has both scientific and social impacts. The major database is built up from digitized and standardized film data obtained by several observatories around the world and covers a timespan more than 100 years. After careful calibration, we will develop feature extraction and data mining tools and provide them together with the comprehensive database for the astronomical community. Our final goal is to address several physical issues: filament behavior in solar cycles, abnormal behavior of solar cycle 24, large-scale solar eruptions, and sympathetic remote brightenings. Significant progresses are expected in data mining algorithms and software development, which will benefit the scientific analysis and eventually advance our understanding of solar cycles.

scholarly journals SHORT-TERM SPACE WEATHER FORECASTING BASED ON THE EXPONENTIAL SMOOTHING METHOD

2021 ◽  
pp. 42-46
Author(s):  
ANASTASIA SERGEEVNA NADTOCHY ◽  
◽  
DMITRIY VLADIMIROVICH FOMIN ◽  
Keyword(s):  
Space Weather ◽  
Nuclear Physics ◽  
Weather Forecasting ◽  
Calculated Data ◽  
Weather Forecast ◽  
Exponential Smoothing ◽  
Launch Vehicles ◽  
Short Term ◽  
Space Weather Forecasting ◽  
Exponential Smoothing Method

The paper presents information on the results of short-term space weather forecasting for the Vostochny cosmodrome based on data on the electron flux density with energies above 2 MeV received from satellites from the operator's site of the Space Weather Forecast Center of the Moscow State University Institute of Nuclear Physics. The analysis of the calculated data on the level of near-Earth radiation, as a result of the use of various extrapolation methods, showed that the method of exponential smoothing is most effective for short-term space weather forecasting. Such forecasts can be used when planning launches of launch vehicles from spaceports.

The Impact of Sunspots Number on Critical Frequencies foF2 for the IONOSPHERIC Layer-F2 Over Erbil Station During the Down Phase of Solar Cycle 24

2021 ◽  
Vol 19 (8) ◽  
pp. 157-168
Author(s):  
Wafaa H.A. Zaki
Keyword(s):  
Solar Activity ◽  
Solar Cycle ◽  
Sunspot Number ◽  
Critical Frequency ◽  
Radio Communication ◽  
Ionospheric Layer ◽  
Solar Cycle 24 ◽  
Critical Frequency Fof2 ◽  
Cycle 24 ◽  
The Impact

The ionosphere layer (F2) is known as the most important layer for High frequency (Hf) radio communication because it is a permanent layer and excited during the day and night so it is able to reflect the frequencies at night and day due to its high critical frequency, and this layer is affected by daily and monthly solar activity. In this study the characteristics and behavior of F2 layer during Solar cycle 24 were studied, the effect of Sunspots number (Ri) on the critical frequency (foF2), were investigated for the years (2015, 2016, 2017, 2018, 2019, 2020) which represents the down phase of the solar cycle 24 over Erbil station (36° N, 44° E) by finding the critical frequency (foF2) values, the layer’ s impression times are determined for the days of solstice as well as equinox, where the solar activity was examined for the days of the winter and summer solstice and the days of the spring and autumn equinoxes for a period of 24 hours by applied the International Reference Ionosphere model IRI (2016). The output data for foF2 were verified by using the IRI-Ne- Quick option by specifying the time, date and Sunspot number parameters. Statistical analysis was caried out through the application of the Minitab (version 2018) in order to find the correlation between the critical frequency (foF2) of Ionospheric layer F2 and Sunspot number. It was concluded that the correlation is strong and positive, this indicate that critical frequency (foF2) increase with increasing Sunspots number (Ri) for solar cycle 24.

Seasonal and diurnal variations of geomagnetic activity and their role in Space Weather forecast

2001 ◽  
Vol 79 (6) ◽  
pp. 907-920 ◽  
Author(s):  
W Lyatsky ◽  
A M Hamza
Keyword(s):  
Solar Wind ◽  
Seasonal Variation ◽  
Diurnal Variation ◽  
Geomagnetic Activity ◽  
Space Weather ◽  
Weather Forecast ◽  
Diurnal Variations ◽  
Ionospheric Conductivity ◽  
Solar Wind Parameters ◽  
Possible Cause

A possible test for different models explaining the seasonal variation in geomagnetic activity is the diurnal variation. We computed diurnal variations both in the occurrence of large AE (auroral electrojet) indices and in the AO index. (AO is the auroral electrojet index that provides a measure of the equivalent zonal current.) Both methods show a similar diurnal variation in geomagnetic activity with a deep minimum around (3–7) UT (universal time) in winter and a shallower minimum near 5–9 UT in equinoctial months. The observed UT variation is consistent with the results of other scientists, but it is different from that expected from the Russell–McPherron mechanism proposed to explain the seasonal variation. It is suggested that the possible cause for the diurnal and seasonal variations may be variations in nightside ionospheric conductivity. Recent experimental results show an important role for ionospheric conductivity in particle acceleration and geomagnetic disturbance generation. They also show that low ionospheric conductivity is favorable to the generation of auroral and geomagnetic activity. The conductivity in conjugate nightside auroral zones (where substorm generation takes place) is minimum at equinoxes, when both auroral zones are in darkness. The low ionospheric conductivity at equinoxes may be a possible cause for the seasonal variation in the geomagnetic activity with maxima in equinoctial months. The diurnal variation in geomagnetic activity can be produced by the UT variation in the nightside ionospheric conductivity, which in winter and at equinoxes has a maximum around 4–5 UT that may lead to a minimum in geomagnetic activity at this time. We calculated the correlation patterns for the AE index versus solar-wind parameters inside and outside the (2–7) UT sector related to the minimum in geomagnetic activity. The correlation patterns appear different in these two sectors indeed, which is well consistent with the UT variation in geomagnetic activity. It also shows that it is possible to improve significantly the reliability of the Space Weather forecast by taking into account the dependence of geomagnetic activity not only on solar-wind parameters but also on UT and season. Our test shows that a simple account for the dependence of geomagnetic activity on UT can improve the reliability of the Space Weather forecast by at least 50% in the 2–7 UT sector in winter and equinoctial months. PACS No.: 91.25Le

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