Variations of ionospheric and geomagnetic field parameters during the June 18, 2013 Bachat earthquake

The paper presents the results of a study of variations in ionospheric parameters and local magnetic constant before, during, and after the Вachat earthquake, which occurred on June 18, 2013 at 23:02 UT (June 19, 2013 at 06:02 LT) with a magnitude 5.3–5.6 and epicenter coordinates 54.29° N, 86.17° E. We have used data from IPGG SB RAS and TSU ionospheric stations and INTERMAGNET geomagnetic observatories. We have established that in the period preceding the earthquake there was a rather sharp increase in the magnetic moment, and in the subsequent period there was an equally sharp decrease in the magnetic moment. It is noted that the analysis of the daily average values of the local magnetic constant is the most promising for searching for geomagnetic precursors of earthquakes. We have found a low strong sporadic layer Es for two days before the event, the like of which was not observed for 15 days before and 15 days after the event. In addition, on the days preceding the shock, the background values of the F2-layer critical frequency were larger by more than 20 % at the local pre-event hours. On the second day after the earthquake, there appeared a night-time region of low values (about 14 %), which persisted until the morning of the third day.

Variations of ionospheric and geomagnetic field parameters during the June 18, 2013 Bachat earthquake

The paper presents the results of a study of variations in ionospheric parameters and local magnetic constant before, during, and after the Vachat earthquake, which occurred on June 18, 2013 at 23:02 UT (June 19, 2013 at 06:02 LT) with a magnitude 5.3–5.6 and epicenter coordinates 54.29 ° N, 86.17 ° E. We have used data from IPGG SB RAS and TSU ionospheric stations and INTERMAGNET geomagnetic observatories. We have established that in the period preceding the earthquake there was a rather sharp increase in the magnetic moment, and in the subsequent period there was an equally sharp decrease in the magnetic moment. It is noted that the analysis of the daily average values ​​of the local magnetic constant is the most promising for searching for geomagnetic precursors of earthquakes. We have found a low strong sporadic layer Es for two days before the event, the like of which was not observed for 15 days before and 15 days after the event. In addition, on the days preceding the shock, the background values ​​of the F2-layer critical frequency were larger by more than 20% at the local pre-event hours. On the second day after the earthquake, there appeared a night-time region of low values ​​(about 14%), which persisted until the morning of the third day.

Design of magnetoelectric machines with annular armature winding

Design strategy of synchronous machines with annular armature winding and rotor placed PMs is discussing, which can provide advantages instead of general ones with drum armature winding in two-pole machine magnetic systems with developed outer diameter. Tie derivations between of stator bore volume, torque and electromagnetic loads via Magnetic constant (Arnold’s), equations for linear load, for PMs magnetic conductivity in dependence from rated parameters of magnetically hard material, for phase’s EMF. Slots filling by areas of rectangular wires and of coil and major insulation are taking into consideration. Numerical testing, executed via torque-angle (static) curves calculation by means of finite-element method, shows that the motors, that designed with appropriated torque multiplicity are satisfying to initial technical requirements, that is confirms methodic validity. During numerical testing tooth harmonics, provided by stator tooth structure, influence was evaluating and was given recommendations for reduction this influence. The results of power and torque characteristics comparison with traditional machine supplied by drum winding represented, which confirms capability of declared advantages receipt.

Moving daily average of the hourly magnetic field values - the example of usage at Novosibirsk Observatory during 2011 (results and prospects)

The parameters of the equivalent central dipole calculated using hourly values of the magnetic field elements during 2011: the angular elements transformed to the hourly values of the geographic coordinates of the North magnetic pole and the intensity values transformed to local magnetic constant. Next step is the calculation of the daily mean values at every hour. This method applied to both current digital data and historical data presented as monthly tables of hourly values. The advantage of method is its ability to show the changes of the magnetic field independently from daily variation. Using of the “integrate” parameters (the magnetic pole coordinates and local magneto constant) allows detect the regional features of its variations. The features in the daily values compared with anomalous geological and geophysical events observed in the past and predicted in the near future.

Theoretical evaluation of left-handed material parameters with cylindrical inclusions

We studied the electric and magnetic responses from the infinite chain of circular metallic cylinders periodically engrossed in a dielectric matrix (wax). The study used the effective medium theory developed for the long-wavelength approximations of complex effective constants. The analytical results show that the presented metamaterial exhibits the phenomenon with negative effective parameters. Moreover, increase in volume fraction increases the negativity of the effective parameters. With an increase in gigahertz (GHz) frequencies, the effective dielectric constant approaches zero, and a minor increase in the negativity of the effective magnetic constant is observed.

Magnetic-time model at off-season germination

Effect of static magnetic field on germination of mung beans is described. Seeds of mung beans, were exposed in batches to static magnetic fields of 87 to 226 mT intensity for 100 min. Magnetic time constant - 60.743 Th (Tesla hour) was determined experimentally. High value of magnetic time constant signifies lower effect of magnetic field on germination rate as this germination was carried out at off-season (13°C). Using decay function, germination magnetic constant was calculated. There was a linear increase in germination magnetic constant with increasing intensity of magnetic field. Calculated values of mean germination time, mean germination rate, germination rate coefficient, germination magnetic constant, transition time, water uptake, indicate that the impact of applied static magnetic field improves the germination of mung beans seeds even in off-season