scholarly journals Field Strength Vs. Temperature Relation and the Structure of Sunspots

1993 ◽  
Vol 141 ◽  
pp. 48-51
Author(s):  
S.K. Solanki ◽  
U. Walther ◽  
W. Livingston
Keyword(s):  
Field Strength ◽  
Radial Distance ◽  
Magnetic Vector ◽  
Temperature Relation ◽  
Magnetic Gradients ◽  
The Relationship

AbstractThe relationship between the magnetic vector and the temperature of a large symmetric sunspot is studied on the basis of 1.56 µm spectra. From this relation we estimate the shape of the τ = 1 surface. i.e. the Wilson depression, as a function of radial distance in the sunspot. We find that the Wilson depression is relatively small throughout the penumbra and changes by 200–500 km at the umbral boundary. We also estimate the magnitude of magnetic gradients and curvature forces.

FIELD STRENGTH IN PULSED MERCURY ARCS

1965 ◽  
Vol 43 (4) ◽  
pp. 670-675 ◽  
Author(s):  
B. Ahlborn ◽  
A. J. Barnard ◽  
H. D. Campbell
Keyword(s):  
Field Strength ◽  
Mercury Vapor ◽  
Average Field ◽  
Arc Plasma ◽  
Cathode Fall ◽  
Arc Current ◽  
Mercury Electrodes ◽  
The Relationship ◽  
Pulsed Arc ◽  
Arc Current And Voltage

In a pulsed arc with mercury electrodes the average column field strength Eco was measured for different currents I, and the relationship [Formula: see text] was found. The variations of arc current and voltage with time indicate that the anode and cathode fall regions have a combined thickness of 3 × 10−6 cm, and an average field strength of 2 × 106 V/cm. The arc plasma is formed mainly from mercury vapor, rather than from the surrounding gas.

Survey of Jupiter’s Plasma Disk from Juno Observations

2021 ◽  
Author(s):  
Fran Bagenal ◽  
Ezra Huscher ◽  
Robert Wilson ◽  
Frederic Allegrini ◽  
Robert Ebert
Keyword(s):  
Magnetic Field ◽  
Field Strength ◽  
Magnetic Field Strength ◽  
Plasma Sheet ◽  
Radial Distance ◽  
Regular Structure ◽  
Plasma Properties ◽  
Density Distributions ◽  
Jovian System ◽  
Structure Density

<p>Using 30 inbound passes through the Jovian system, we combine measurements from the fields and particles instruments on the Juno spacecraft to survey the properties of Jupiter's plasma disk. Juno's orbit is particularly useful for exploring the variation in plasma conditions with latitude as well as radial distance (from ~10 to ~50 RJ). We present basic plasma properties (composition, density, temperature, velocity, magnetic field strength) to make maps of the plasma environment. Also show that on some of the 53-day orbits the plasma sheet has regular structure (density having roughly Gaussian distribution with latitude and decreasing with distance) but there are also highly irregular orbits with low or erratic density distributions.</p>

The Effect of Magnetic Field Strength on the Oscillatory Characteristics of Multimode Magnetoconvection

1993 ◽  
Vol 10 (4) ◽  
pp. 275-277
Author(s):  
J.O. Murphy ◽  
J.M. Lopez ◽  
C.P. Dyt
Keyword(s):  
Magnetic Field ◽  
Field Strength ◽  
Magnetic Field Strength ◽  
The Relationship ◽  
The Magnetic Field ◽  
Period Of Oscillation

AbstractThe effect of varying magnetic field strength on the frequency of oscillatory motions for cellular multimode magnetoconvection has been investigated. In addition the influence of the thermal, viscous and magnetic diffusivities have been taken into account and the range of preferred horizontal scales established. The relationship between the period of oscillation and the magnetic field strength is determined.

Defining the Relationship of Magnetohydrodynamic Voltages and Magnetic Field Strength

2017 ◽  
Author(s):  
Kevin J. Wu ◽  
T. Stan Gregory ◽  
Michael C. Lastinger ◽  
Brian Boland ◽  
Zion Tsz Ho Tse
Keyword(s):  
Magnetic Field ◽  
Blood Flow ◽  
Field Strength ◽  
Aortic Arch ◽  
Magnetic Field Strength ◽  
Quantitative Relationship ◽  
Solution Concentration ◽  
Exercise Stress ◽  
Induced Voltage ◽  
The Relationship

The magnetohydrodynamic (MHD) effect is observed in flowing electrolytic fluids and their interactions with magnetic fields. The magnetic field (B0), when perpendicular with the electrolytic fluid flow (μ), causes the shift of the charged particles in the fluid to shift across the length of the vessel (L) normal to the plane of B0 and flow, creating a voltage (VMHD) observable through voltage potential measurements across the flow (Eqn. 1)[1].(1)VMHD=∫0Lu⇀×B0⇀·dL⇀In the medical field, this phenomenon is commonly encountered inside of a human body inside of an MRI machine (Fig. 1). The effect appears most prominently inside the aortic arch due to orientation and size, and is a large contributing factor to noise observed in intra-MRI ECGs [2, 3]. Traditionally, this MHD induced voltage (VMHD) was filtered out to obtain clean intra-MRI ECGs, but recent studies have shown that the VMHD induced in a vessel is related to the blood flow through it (stroke volume in the case of the aortic arch) [4]. Further proof of this relationship can be shown from the increase in VMHD measured from periphery blood vessels during periods of elevated heart rate from exercise stress, when compared to baseline state [5]. Previously, a portable device was built to utilize induced VMHD as an indicator of flow [6]. The device was capable of showing change in blood flow, utilizing a blood flow metric obtained from VMHD, however a quantitative relationship between VMHD and blood flow has yet to be established. This study aims to define the relationship between induced VMHD and magnetic field strength in a controlled setting. Through modulating the distance between a pair of magnets around a flow channel, we hope to better realize the relationship between magnetic field strength and induced VMHD with constant flow and electrolytic solution concentration.

The relationship between 10Be and geomagnetic field strength records in central North Atlantic sediments during the last 80 ka

1995 ◽  
Vol 136 (3-4) ◽  
pp. 551-557 ◽  
Author(s):  
Christian Robinson ◽  
Grant M. Raisbeck ◽  
Françoise Yiou ◽  
Benoiˆt Lehman ◽  
Carlo Laj
Keyword(s):  
Field Strength ◽  
North Atlantic ◽  
Geomagnetic Field ◽  
The Relationship ◽  
Geomagnetic Field Strength

A Study of Some of the Meteorological Effects on Radio Propagation at 96.3 Mc between Richmond, Va. and Washington, D. C.

1954 ◽  
Vol 35 (2) ◽  
pp. 56-59 ◽  
Author(s):  
D. L. Randall
Keyword(s):  
Refractive Index ◽  
Field Strength ◽  
Meteorological Data ◽  
Radio Propagation ◽  
Refractive Indices ◽  
Wind Speeds ◽  
Meteorological Observations ◽  
Relationship Of ◽  
The Relationship ◽  
Meteorological Effects

This study was made to investigate the relationship of surface meteorological data and corresponding surface refractive indices to radio field strengths in the FM frequency band. For meteorological observations during which the wind speeds were equal to or greater than 10 mph, and when fronts, low overcast clouds (less than 5000 ft), rain, thunderstorms and fogs were excluded, a 0.70 correlation coefficient was found between hourly surface refractive index and hourly median field strength over a Washington-Richmond path at a frequency of 96.3 Mc.

On the Relationship between the Rotational Velocity and the Field Strength of Solar Magnetic Elements

2004 ◽  
Vol 607 (2) ◽  
pp. L135-L138 ◽  
Author(s):  
Junwei Zhao ◽  
Alexander G. Kosovichev ◽  
Thomas L. Duvall, Jr.
Keyword(s):  
Field Strength ◽  
Rotational Velocity ◽  
Magnetic Elements ◽  
The Relationship

scholarly journals A Magnetic Field Strength vs. Temperature Relation in Sunspots

1994 ◽  
Vol 154 ◽  
pp. 477-482
Author(s):  
Greg Kopp ◽  
Douglas Rabin
Keyword(s):  
Magnetic Field ◽  
Field Strength ◽  
Magnetic Field Strength ◽  
Atmospheric Turbulence ◽  
Near Infrared ◽  
Scattered Light ◽  
Nonlinear Relationship ◽  
Temperature Relation ◽  
Highly Sensitive ◽  
Increased Sensitivity

The near infrared presents several new and powerful advantages in the diagnostics of sunspot atmospheres: (1) increased magnetic sensitivity in Zeeman-split lines, (2) increased sensitivity of umbral brightness to temperature, and (3) reduced scattered light and seeing disturbances due to atmospheric turbulence. This has revealed a strong and consistent relationship between sunspot brightness and magnetic field strength.We have made spatial/spectral observations of sunspots in the highly sensitive (g = 3) Fe I line at λ = 1.5649 μm to compare field strengths with continuum intensities. We find a characteristic but nonlinear relationship between magnetic field strength, B, and brightness temperature, Tb, in sunspots. In umbrae there is an approximately linear relation between B2 and Tb.

Sign in / Sign up

Export Citation Format

Share Document