t o t he Results o f Radio Astronomical a nd Magnetometric Observations Ryabov M Orlyuk M Sukharev A Strakhov Y Bezrukovs V Romenets A Sobitnyak L Galanin V Strakhov E Derevyagin V ID: 1023002
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1. Solar and Geomagnetic Activity Specifics in Odessa Magnetic Anomaly Zone According to the Results of Radio Astronomical and Magnetometric ObservationsRyabov M., Orlyuk M., Sukharev A., Strakhov Y, Bezrukovs V., Romenets A., Sobitnyak L., Galanin V., Strakhov E., Derevyagin V.,
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3. NOAA Recent predicted of 25 solar cycleNOAA's official forecast:
4. 25 solar cycleSunspot numbers in May 2022 were the highest in almost 8 years, more than doubling NOAA's official forecastThere is no longer any doubt that Solar Cycle 25 is on track to outperform its predecessor, historically weak Solar Cycle 24, which peaked in 2014.
5. Jan 2022 Solar and geomagnetic events
6. Radiation storms in 2022 years
7. CME and geomagnetic storms
8. Interactions magnetic storms
9. Sporadic Solar radio emission
10. Jan 2022 Feb 2022
11. March 2022 April 2022
12. Magnetic Storms ( 14 – 20 jan 2022)
13. From the beginning of observations in 1987 year at a radio telescope "URAN-4" the fluxes monitoring of high-power galactic and extragalactic radio sources is carried out. The radio telescope URAN-4 is the rectangular antenna lattice consisting of 128 broadband vibrators located in the direction the East – the West (220x22m). The size of diagram the W – E direction is equal 2,8º. Fluctuation sensitivity is 150 Jy.
14. 3C144 (Crab Nebula – SNR)Program of monitoring 3С144 = 05h 31m 30 s = 21° 39 m 3C274 = 12h 28m 18 s = 12 ° 40 m 3C405 = 19h 57m 47 s = 40 ° 36 m 3C461 = 23h 21m 07 s = 58 ° 34 m3C405-CygA-Radiogalaxy3C274 – VirgoA- Radiogalaxy3C461 – CasA - SNR
15. Observations of sources for 24h3С144 -120m до + 120m , T = 40m , 7 scans. 3С274 - 120m до + 120m , T = 40m , 7 scans. 3С405 - 120m до + 80 m , T = 40m , 6 scans. 3С461 - 60 m до + 120 m , T = 60m , 4 scans total - 13 hours 20 minutesExemplar of record of a source 3C405 received in the automatic registration mode
16. Time observation radio sources
17. URAN-4 observations 2020 years
18. URAN-4 observations Feb 2022 years
19. URAN-4 observations March 2022
20. 3C 405, 25 MHz, Pol-A, 01-02 Jul 2021Area of short-time quasi-periodic variations1.1 min - 6.2 minWeak geomagnetic storm
21. Unlike other radio telescopes URAN system, the largest low-frequency telescope in Ukraine UTR-2, and the newest radio telescope GURT, the URAN-4 antenna has simpler system for detecting radio emission and cannot immediately build dynamic spectrum. Because, observation of radio sources is currently carried out at two fixed frequencies of 20 and 25 MHz, despite the fact that the operating frequency range is about 10 - 30 MHz. However, the engineering group is working to expand the number of frequencies of simultaneous observations.Example of recording the total power (sum of two half-antennas) for the source 3C 461 (Cas A) 24-25 Sep 2021The URAN-4 radio telescope records the passages (scans) of radio sources through the antenna’s beam pattern; as a result, the records have a sinusoidal trend.
22. Cleaning of observational data from noise and small radio interference was performed using a smoothing cubic spline. Strong interference drop-out points were removed by manual filtering.The original raw records of the 3C 461 source flux (Cas A), at a frequency of 25 MHz, polarization A, with noise and drop-out points. Received 02 Aug 2021.This plot shows the same source flux records of 3C 461 (Cas A), after RFI removal, smoothing and cubic spline interpolation. Distortions have been removed and fast variations of 3C 461 flux are clearly visible.
23. Fast fluctuations of the radio-flux were distinguished by Fourier bandpass filtering, from about 14 or from about 7 minutes, depending on the radio source.Initial dataFiltered dataTo construct spectrograms, the STFT method was used, so the frequencies are not the real frequencies of antenna’s receiving, but the calculated Fourier frequencies.This made it possible to determine the change over time in fast ionospheric variations (scintillations) of the radio sources flux.3C 46125 MHzPol-A27-28Sep2021
24. Weak geomagnetic disturbances on September 24-25, 2021. Cassiopeia A has more broadband flux variations and their time scale rapidly change over time.Calm geomagnetic field on September 27-28, 2021. The minimum characteristic time of Cassiopeia A flux variations is not less than 25 seconds. During quiet geomagnetic field, there can be quasi-periodic flux variations.2 – 6 min
25. Odessa regional magnetic anomaly.A large Ukrainian magnetic anomaly in Odessa region and Odessa city was first investigated in 1892.Due to significant influence of ionosphere state on conditions of observations cosmic radio sources in the Odessa Observatory “URAN-4” (decameter radio telescope (phased array), frequency range 10 - 30 MHz), direct measurements of geomagnetic field variations at center of magnetic anomaly will make it possible to clarify physical causes of observed systematic effects in fast and slow changes in the flux density of radio sources over time.In the figure, the calculated geomagnetic field of sources in the Odessa magnetic anomaly.Anomalous magnetic field of the region under study changes from -400 nT in eastern part of the Odessa region to +1200 nT in its central part. Model sources of anomalies consists from blocks with vertical and inclined lateral faces, at depths from 1-7 km (sources of local anomalies) and 7-40 km (sources of regional anomaly). The magnetization of the blocks varies from 0.7 A / m for the background source to 3.5-4 A / m directly for sources of anomaly. There is a secular increase in induction of the geomagnetic field.OdessaStepanovka
26. Magnetic observatory "Odessa“The magnetic observatory "Odessa" was founded by the Novorossiysk Imperator University, in the territory of a botanical garden, at the beginning of the XX century. In 1936 it was transferred to the village of Stepanovka (near Odessa) by the Odessa State University. After world war 2th the station became to belong to the Institute of geophysics NAS Ukraine. Since 1948 measurements of a magnetic field of Earth, with a time frame – are conducted 1 hour. At the same time measurements of three elements of a magnetic field are registered: horizontal component (H), vertical component (Z) and inducement (D).
27. Instrument and methodology for analyzing observational data.To study fast variations of geomagnetic field in central region of the magnetic anomaly, a precision fux-gate three-component magnetometer LEMI-008 (developed by the Space Research Institute of the National Academy of Sciences of Ukraine) was used. For protection against electromagnetic interference the device is installed in cellar of the Odessa Astronomical Observatory.The range of measurement of variations is +/- 100,000 nT (1), +/- 3200 nT (2). The resolution is 10 nT (1), 0.1 nT (2).The noise level in the analog channel (0.1-1 Hz) is less than 10 pT. The averaging measurements time is 1, 2, 5, 10, 60 seconds. Long-term zero drift +/- 5 nT per year. Correction of time and position by GPS signals.Observations with 1 second resolution were carried out from November 2017 to April 2018.Electronics unitThree-axis flux-gate sensorTo calculate the time-frequency spectra, a fast version of continuous wavelet transform is used, as well as band-pass filtering based on it. When studying oscillations in the period band about minute and little less, FFT interpolation was applied beforehand for upsampling data.
28. Geomagnetic variationsOdessa - Stepanovka
29. Geomagnetic variations Odessa - Stepanovka