scholarly journals Experimental observation of permanent magnet rotation

2021 ◽  
Author(s):  
Weiming Tong ◽  
Bihe Chen
Keyword(s):  
Magnetic Field ◽  
Permanent Magnet ◽  
Hollow Sphere ◽  
Experimental Methods ◽  
The Sun ◽  
Rotational Force ◽  
The Earth ◽  
The Relationship ◽  
The Magnetic Field ◽  
Rotation Behaviour

Abstract Why does the Earth rotate? At present, several theories on Earth rotation remain hypotheses. Hence, the aim of this study was to obtain experimental evidence of the relationship between the rotational force and magnetic field so that we can use experimental devices to demonstrate the rotation relationship among the planets and the sun. Each permanent magnet rotating under the action of an external force is installed on the shaft of DC motor; each magnetic ball designed to rotate in a magnetic field is placed in the center of a hollow sphere that can float on the water. Using the above setup, the experimental methods and procedures based on this research can be used to observe the rotation behaviour of a permanent magnet in a magnetic field, understand the reason for its rotation, and determine the strength of the rotational force of the permanent magnet in the magnetic field.

scholarly journals Experimental method of permanent magnet rotation

2021 ◽  
Author(s):  
Weiming Tong
Keyword(s):  
Magnetic Field ◽  
Permanent Magnet ◽  
Hollow Sphere ◽  
Driving Force ◽  
The Sun ◽  
Not Given ◽  
Free Rotation ◽  
Experimental Procedure ◽  
The Earth ◽  
The Relationship

Abstract Why does the earth rotate? In the 17th century, an accurate description of the earth’s rotation was provided via Newtonian mechanics1. However, the driving force was not given a mechanistic treatment, was merely ascribed to a “push” by God. At present, All kinds of theories about the rotation of the planet are still hypotheses2,3. In this study, It provides experimental evidence for researching the relationship between planet (Earth) rotation and magnetic fields4. The proposed experimental devices and research methods are based on the characteristics of the kinematic relations between the sun and planet. A permanent magnet representing the sun is installed on the shaft of a DC motor, spherical magnet representing the planet is designed at the center of hollow sphere and can float on water, ensure free rotation. Based on the above device5, the method of permanent magnet rotation in magnetic field and the experimental procedure of rotation reason are introduced.

scholarly journals In-Situ Multi-Spacecraft and Remote Imaging Observations of the First CME Detected by Solar Orbiter and BepiColombo

2021 ◽  
Author(s):  
Emma Davies ◽  
Christian Möstl ◽  
Matthew Owens ◽  
Andreas Weiss ◽  
Tanja Amerstorfer ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Large Scale ◽  
Heliocentric Distance ◽  
The Sun ◽  
Remote Imaging ◽  
The Earth ◽  
In Situ Observations ◽  
Scale Properties ◽  
The Magnetic Field

<p>On April 19th 2020 a CME was detected by Solar Orbiter at a heliocentric distance of 0.8 AU and was also observed in-situ on April 20th by both Wind and BepiColombo. During this time, BepiColombo had just completed a flyby of the Earth and therefore the longitudinal separation between BepiColombo and Wind was just 1.4°. The total longitudinal separation of Solar Orbiter and both spacecraft near the Earth was less than 5°, providing an excellent opportunity for a radial alignment study of the CME. We use the in-situ observations of the magnetic field at Solar Orbiter with those at Wind and BepiColombo to analyse the large-scale properties of the CME and compare results to those predicted using remote observations at STEREO-A, providing a global picture of the CME as it propagated from the Sun to 1 AU.</p>

Study on Magnetic Field Distribution in the Container of Magnetic Barrel Finishing Machine

2009 ◽  
Vol 76-78 ◽  
pp. 294-299
Author(s):  
Y. Zhang ◽  
Masato Yoshioka ◽  
Shin-Ichiro Hira
Keyword(s):  
Magnetic Field ◽  
Permanent Magnet ◽  
Strong Magnetic Field ◽  
Field Distribution ◽  
Magnetic Field Distribution ◽  
Barrel Finishing ◽  
The Relationship ◽  
The Magnetic Field

The distribution of magnetic field in the container is important for the polishing ability of a permanent magnet-type magnetic barrel finishing machine. Therefore, in this study, the magnetic field distribution was measured with different magnets arrangement. It is found that the polarity and strength of magnets on a magnet block greatly affect the distribution of magnetic field. Polishing experiments were done to investigate the polishing ability. The relationship between the magnetic field distribution and the polishing ability was discussed. As a result, it was concluded that strong magnetic field led to superior polishing ability.

Nanoscale Dust Production at 1 Au; Identification and Tracking with 12 Spacecraft

2020 ◽  
Author(s):  
Hairong Lai ◽  
Yingdong Jia ◽  
Martin Connors ◽  
Christopher Russell
Keyword(s):  
Magnetic Field ◽  
Solar Wind ◽  
Field Enhancement ◽  
Solar Radius ◽  
The Sun ◽  
The Earth ◽  
Complete Test ◽  
Spacecraft Data ◽  
The Magnetic Field ◽  
Field Enhancements

<p>Interplanetary Field Enhancements are phenomena in the interplanetary magnetic field, first discovered near Venus, during an extremely long duration (12 hours) and large size (about 0.1 AU) passage across the Pioneer Venus spacecraft. Three and a half hours later and 21 x 10<sup>6</sup> km farther from the Sun, this structure, somewhat weaker and off to the side of the expected radial path of any solar initiated disturbance, was seen by first Venera 13 and then Venera 14, trailing behind V13. Since this discovery, many smaller such disturbances have been observed and attributed to collisions of small rocks in space at speeds of about 20 km/s at 1 AU and faster, closer to the Sun. All sightings with magnetometers and other space plasma instruments give very precise measurements of the radial structure (of usually the magnetic field), but the scale transverse to the solar radius is poorly defined, as is the temporal evolution of the structure from single spacecraft data.</p><p>On January 16, 2018, near Earth, 12 spacecraft equipped with plasma spectrometers and magnetometers observed the passage of a single Interplanetary Field Enhancement. The magnetic field profiles at the four 1 AU spacecraft were very similar. The profiles were obtained at different times appropriate to their locations. The 4 Cluster spacecraft were closer to the Earth and in a region in which the solar wind had slowed down because of the Earth’s bow wave (shock) in the solar wind. The disturbance in the shocked solar wind occurred at the time expected if the IFE structure had not been slowed by the plasma, but rather had proceeded with the momentum it had prior to the shock crossing. If the disturbance causing particles are small bits of rock (not protons), then they should have kept most of their momentum in crossing the bow shock. We view this as a complete test of the dust producing collisional origin of these Interplanetary Field Enhancements, and a clear demonstration of how the solar wind clears out the dust in the inner solar system produced by the continuing destructive collisional process.</p>

MAGNETIC FIELD REVERSALS OF THE EARTH: A TWO–DISK RIKITAKE DYNAMO MODEL

2009 ◽  
Vol 23 (28n29) ◽  
pp. 5492-5503 ◽  
Author(s):  
SANDRO DONATO ◽  
DOMENICO MEDURI ◽  
FABIO LEPRETI
Keyword(s):  
Magnetic Field ◽  
Laboratory Experiments ◽  
Dynamo Model ◽  
The Sun ◽  
The Earth ◽  
Simulation Based ◽  
Dynamical Regimes ◽  
Polarity Reversals ◽  
Disk Dynamo ◽  
The Magnetic Field

The Sun and the Earth possess dipolar magnetic fields that exhibit polarity reversals. Recent works, based on numerical simulations and laboratory experiments, found similar dynamical behaviours. We present results of a statistical analysis of a numerical simulation based on a generalized two–disk dynamo model. From a first investigation, we found that the dynamics of the system is controlled by the variations of the ratio of the torques and we observed different dynamical regimes characterized either by bursts or reversals, which can be periodic or random, of the magnetic field.

Experiments on permanent magnets rotation

2021 ◽  
Author(s):  
Weiming Tong
Keyword(s):  
Permanent Magnet ◽  
Driving Force ◽  
Permanent Magnets ◽  
Newtonian Mechanics ◽  
The Sun ◽  
Not Given ◽  
Free Rotation ◽  
The Earth ◽  
Planetary Rotation ◽  
The Relationship

Abstract Why does the Earth rotate? What forces are responsible for planetary rotation? In the 17th century, an accurate description of the Earth’s rotation was provided via Newtonian mechanics. However, the driving force was not given a mechanistic treatment, and it was merely ascribed to a "push" by God. At present, several theories on planetary rotation remain as hypotheses. Hence, the aim of this study was to obtain experimental evidence on the relationship between planetary (Earth) rotation and magnetic fields. The proposed experimental devices and research methods are based on the characteristics of the kinematic relations between the sun and a planet. A permanent magnet representing the sun is installed on the shaft of a DC motor; a spherical magnet representing the planet is placed at the centre of hollow a sphere that can float on water, ensuring free rotation. Using the above setup, experiments for analysing permanent magnet rotation in a magnetic field and determining the reasons for this rotation were conducted.

Can we explain the low geo-effectiveness of the fast halo CMEs in 2002 with EUHFORIA?

2020 ◽  
Author(s):  
Brigitte Schmieder ◽  
Stefaan Poedts ◽  
Christine Verbeke
Keyword(s):  
Magnetic Field ◽  
Solar Wind ◽  
Disk Center ◽  
Magnetic Clouds ◽  
The Sun ◽  
The Earth ◽  
Halo Cmes ◽  
The Impact ◽  
The Magnetic Field ◽  
Ambient Solar Wind

<p>In 2002 (Cycle 23), a weak impact on the magnetosphere of the Earth has been reported for six halo CMEs related to six X-class flares and with velocities higher than 1000 km/s. The registered Dst minima are all between -17 nT and -50 nT.  A study of the Sun-Earth chain of phenomena related to these CMEs reveals that four of them have a source at the limb and two have a source close to the solar disk center (Schmieder et al., 2020). All of CME magnetic clouds had a low z‑component of the magnetic field, oscillating between positive and negative values.</p><p>We performed a set of EUHFORIA simulations in an attempt to explain the low observed Dst and the observed magnetic fields. We study the degree of deviation of these halo CMEs from the Sun-Earth axis and as well as their deformation and erosion due to their interaction with the ambient solar wind (resulting in magnetic reconnections) according to the input of parameters and their chance to hit other planets. The inhomogeneous nature of the solar wind and encounters  are also important parameters influencing the impact of CMEs on planetary magnetospheres.</p><p> </p>

Emergence of Twisted Magnetic Flux Related Sigmoidal Brightening

2000 ◽  
Vol 179 ◽  
pp. 263-264
Author(s):  
K. Sundara Raman ◽  
K. B. Ramesh ◽  
R. Selvendran ◽  
P. S. M. Aleem ◽  
K. M. Hiremath
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Magnetic Flux ◽  
Ultra Violet ◽  
Active Regions ◽  
Morphological Properties ◽  
Energy Storage And Conversion ◽  
The Sun ◽  
X Rays ◽  
The Magnetic Field

Extended AbstractWe have examined the morphological properties of a sigmoid associated with an SXR (soft X-ray) flare. The sigmoid is cospatial with the EUV (extreme ultra violet) images and in the optical part lies along an S-shaped Hαfilament. The photoheliogram shows flux emergence within an existingδtype sunspot which has caused the rotation of the umbrae giving rise to the sigmoidal brightening.It is now widely accepted that flares derive their energy from the magnetic fields of the active regions and coronal levels are considered to be the flare sites. But still a satisfactory understanding of the flare processes has not been achieved because of the difficulties encountered to predict and estimate the probability of flare eruptions. The convection flows and vortices below the photosphere transport and concentrate magnetic field, which subsequently appear as active regions in the photosphere (Rust & Kumar 1994 and the references therein). Successive emergence of magnetic flux, twist the field, creating flare productive magnetic shear and has been studied by many authors (Sundara Ramanet al.1998 and the references therein). Hence, it is considered that the flare is powered by the energy stored in the twisted magnetic flux tubes (Kurokawa 1996 and the references therein). Rust & Kumar (1996) named the S-shaped bright coronal loops that appear in soft X-rays as ‘Sigmoids’ and concluded that this S-shaped distortion is due to the twist developed in the magnetic field lines. These transient sigmoidal features tell a great deal about unstable coronal magnetic fields, as these regions are more likely to be eruptive (Canfieldet al.1999). As the magnetic fields of the active regions are deep rooted in the Sun, the twist developed in the subphotospheric flux tube penetrates the photosphere and extends in to the corona. Thus, it is essentially favourable for the subphotospheric twist to unwind the twist and transmit it through the photosphere to the corona. Therefore, it becomes essential to make complete observational descriptions of a flare from the magnetic field changes that are taking place in different atmospheric levels of the Sun, to pin down the energy storage and conversion process that trigger the flare phenomena.

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