What is Fields: Definition and 1000 Discussions

FIELDS is a science instrument on the Parker Solar Probe (PSP), designed to measure magnetic fields in the solar corona during its mission to study the Sun. It is one of four major investigations on board PSP, along with WISPR, ISOIS, and SWEAP. It features three magnetometers. FIELDS is planned to help answer an enduring questions about the Sun, such as why the solar corona is so hot compared to the surface of the Sun and why the solar wind is so fast (a million miles per hour).The host spacecraft, Parker Solar Probe, was launched by a Delta IV Heavy on August 12, 2018 from Florida, USA. On August 13, 2018 FIELDS became the first instrument to be activated including beginning deployment of the 4 whip antenna (clamps unlocked) and extension of the magnetometer boom. On September 4, 2018 the whip antennas were deployed.

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  1. R

    Size of bremsstrahlung radiation fields generated by linear accelerators

    Hi everyone, sorry we are talking about pulsed power accelerators again. In this context, it is about the HERMES III again. According to https://apps.dtic.mil/dtic/tr/fulltext/u2/a351472.pdf HERMES III, a 16 terawatt pulsed power accelerator at Sandia National Labs, which fired electron beams...
  2. C

    Is the Configuration of Magnetic Fields Only a Convention?

    If I understand correctly, the concept of electric and magnetic fields originated with Faraday and was developed by reconceptualizing forces acting at-a-distance. For example, the electric field concept was developed by looking at the force on a test charge in the presence of a source charge...
  3. K

    I Finite fields, irreducible polynomial and minimal polynomial theorem

    I thought i understood the theorem below: i) If A is a matrix in ##M_n(k)## and the minimal polynomial of A is irreducible, then ##K = \{p(A): p (x) \in k [x]\}## is a finite field Then this example came up: The polynomial ##q(x) = x^2 + 1## is irreducible over the real numbers and the matrix...
  4. Quarinteen

    EM fields and magnetic induction from an experiment

    If you take copper wire and wrap it tightly around a bolt will that alone create and hold a magnetic field? I add an image for clarification
  5. J

    Divergence Theorem Problem Using Multiple Arbitrary Fields

    My main issue with this question is the manipulation of the two arbitrary fields into a single one which can then be substituted into the divergence theorem and worked through to the given algebraic forms. My attempt: $$ ∇(ab) = a∇b + b∇a $$ Subsituting into the Eq. gives $$ \int dS ·...
  6. Glenn Rowe

    I Lorentz Transforms of Electromagnetic Fields

    The Lorentz transformations of electric and magnetic fields (as given, for example in Wikipedia) are $$ \begin{align*} \bar{\boldsymbol{E}}_{\parallel} & =\boldsymbol{E}_{\parallel}\\ \bar{\boldsymbol{E}}_{\perp} &...
  7. aspodkfpo

    I Parallel Plate Fields: Questions & Answers

    Homework Statement:: n/a Relevant Equations:: n/a Sorry for the wonky mouse sketching. Teacher said that arrows must touch the plate at the other end. Is there actually such a thing or is this just preference? I thought convention was for arrow to be in the middle of the line.
  8. Sagittarius A-Star

    B Explaining Galaxy Rotation Speed Discrepancies with GR & Gravitic Fields

    The speed of the ends of the galaxies is higher than what it should be. Current solution: This could be explained by hypothetical "dark matter", which was not found up to now, or by a MOND theory (MOdified Newtonian Dynamics). Can this be explained instead with rotational frame-dragging...
  9. S

    I Theory of "fields" in the sense of fields in physics?

    The mathematical structure called a "field" is an algebraic structure that doesn't capture the properties of what physicists called a "field". What's the name for a mathematical structure that does represent the general concept of physicist's field? Is a mathematical version of a physicist's...
  10. SEYED2001

    I How to prove that some fields are different aspects of one general field?

    Hi! I know some theorists believe all quantum fields and gravitational field are different aspects of one universal field. What does that formally (e.g. mathematically) mean "to be different aspects of" and how can one prove, let's say, fields A and B are different aspects of C? By the way, I...
  11. S

    I Forces (Fields) of Nature and Quantum Foundations

    Is it possible for new forces or fields of nature to be connected to quantum foundations? For example, new forces or fields that choose the decoherent histories or branches. Or generally actualize one of the decoherence branches? Or should new forces or fields of nature be reserved for...
  12. Epsilon Eridani

    Hypothetical discussion on the effect of magnetic fields on planets

    Ok, so I have long been fascinated with magnetic fields and their mysterious nature. I've been wondering what would happen when the magnetic field of Earth gets bent/disturbed/rippled by some extraneous force. I am aware the extent of effects that magnetic fields have on a planet is great, but I...
  13. Immortal68

    B Time, Space, Fields, Spacetime & General Relativity

    Can time and space be thought of fields? And if so, how can this affect spacetime? And then what would this mean for affect general relativity?
  14. jaumzaum

    B Is diamagnetism only present with varying magnetic fields?

    Hello. I was wondering if diamagnetic materials only repel varying electric field? By Ampere law only a variable flux can cause an electromotive force, so, and by what I understood diamagnetism is explained exclusively by Ampere law. Am I wrong?
  15. L

    I Jacobi Fields & Tidal Forces

    Given a one parameter family of geodesics, the variation vector field is a Jacobi field. Mathematically this means that the field, ##J##, satisfies the differential equation ## ∇_{V}∇_{V}J =- R(V,J,)V## where ##V## is the tangent vector field and ##R## is the curvature tensor and ##∇## is the...
  16. N

    Intro Math Math Tour: Explore Math Fields & Prepare for Grad School

    Hello, I am looking for a book that has sections on different areas of math. I’ve browsed through a few discrete math books but they have something similar to this but not at the level I am looking for. Essentially, I would like the book to serve as a tour if you will, so I can try and find a...
  17. G

    Confusion on the magnitude of magnetic fields

    Here, the correct options are A,D. Solution: I got A as answer as ∫ B.dl=µI. But, the answer to the question says that it is a solenoid and therefore Bx=0 for point P. Here I'm a bit confused. I know this system resembles a solenoid in some ways, then By must have some finite value, but...
  18. sophiatev

    I Transformations of Electromagnetic Fields: Griffiths' Claims

    In Griffith's Introduction to Electrodynamics, chapter 12, he discusses how electromagnetic fields transform when we move from one inertial reference frame to another. On page 553, he claims He then considers how the electric field inside a conductor made up of two parallel rectangular plates...
  19. PainterGuy

    Were science and engineering seen as distinct fields in 18th century

    Hi, I was reading about Euler-Bernoulli beam theory on Wikipedia and couldn't understand few points under the history section. Source: https://en.wikipedia.org/wiki/Euler–Bernoulli_beam_theory How were they making bridges and buildings back then if they were not 'trusting' science? Isn't...
  20. karush

    MHB -b.2.2.33 - Homogeneous first order ODEs, direction fields and integral curves

    $\dfrac{dy}{dx}=\dfrac{4y-3x}{2x-y}$ OK I assume u subst so we can separate $$\dfrac{dy}{dx}= \dfrac{y/x-3}{2-y/x} $$
  21. B

    A Could the fields for the particles and forces have the same origin?

    I was watching this terrific lecture by David Tong and there was a section at the end from around 50:12 - 54:00 that I found particularly fascinating. I am very much a layman when it comes to these topics and my question may be silly, but what sort of ideas are there that state that all the...
  22. F

    Maxwell's Equations, Dielectrics, Auxiliary Fields D and H

    Hello, I am reviewing how classical EM problems are treated when dielectric materials are involved. Maxwell's equations relate the following vector fields: ##E(r,t)##, ##B(r,t)##, ##D(r,t)##, ##H(r,t)##, ##J(r,t)## and scalar field ##\rho(r,t)##. The two constitutive equations are also needed to...
  23. W

    B Are all quantum fields coherent?

    Is coherence the medium in which quantum waves propagate? Does coherence also exist in the future to flag decoherence events?
  24. M

    Gauss' Theorem - Net Flux Out - Comparing two vector Fields

    Hi, I just have a quick question about a problem involving Gauss' Theorem. Question: Vector field F = \begin{pmatrix} x^2 \\ 2y^2 \\ 3z \end{pmatrix} has net out flux of 4 \pi for a unit sphere centred at the origin (calculated in earlier part of question). If we are now given a vector...
  25. nomadreid

    E-M fields mutual induction in E-M radiation

    In electromagnetic radiation, the electric field and the magnetic field mutually induce each other: but my impression is that it would be better to say that they are two aspects of the same wave, so that there is no time between them. However, an alternative would be that there would be that...
  26. A

    Magnetic fields generated by the general rotations of a charged rigid body

    The calculations for the magnetic field produced by a uniformly rotating charged sphere can be found in basically every book on electrodynamics. I wonder what happen with the magnetic fields produced by rotating rigid solid that also present precession and nutation movements. The question comes...
  27. D

    Exploring the Interaction of Magnetic and Electric Fields

    Hello, If you have an appropriately oriented conductive ring in a constantly changing magnetic field, current will flow in the ring. There will also be a magnetic field associated with the current in the ring. I understand (maybe ... ) that the current is due to the electric field which is...
  28. Amartansh

    I Intuition behind fields in Transmission lines

    How can traveling wave exist on transmission line if wires are perfect conductors (how voltages can be different at different positions on one perfect conductor)? I mean electric fiels should be zero on equipotential source. I know if length is too long compared to wavelength, we get phase...
  29. Aemmel

    Finding killing vector fields of specific spacetime

    I have been at this exercise for the past two days now, and I finally decided to get some help. I am learning General Relativity using Carrolls Spacetime and Geometry on my own, so I can't really ask a tutor or something. I think I have a solution, but I am really unsure about it and I found 6...
  30. E

    Meaning of potential energy in external fields

    Generally potential energies are associated with a system of two bodies. If more than two bodies are involved the total can be determined by summing the contributions pairwise. It would appear as though in any system, the potential energies are all internal to the system. However in classical...
  31. V

    Motion of a Proton in Electric and Magnetic Fields

    a) 248*10^3 eV for 248kV Calculate the energy in J K=248*10^3*1.6*10^-19 =396.8*10^-19 J b) K=(1/2)mv^2 v=sqrt(2k/m) =sqrt((2*396.8*10^-19)/1.67*10^-27) =218^10^3 m/s c) r=mv/qB =1.67*10^-27*218*10^3/1.6*10^-19*1.5*10^-4 =15.17 mr=mv/qB...
  32. Avatrin

    Visualization of vector fields

    Summary:: Seeding and visualization techniques Hi I am looking for resources where I can learn the following: Seeding strategies and algorithms for vector fields (texture-based, geometry, topological) Different techniques for visualizing vector fields (streamlines, glyph-based, LIC etc)
  33. rude man

    How to Recognize Split Electric Fields - Comments

    Continue reading...
  34. vis viva

    E&M fields simulated and visualized in COMSOL, is that how they 'look' IRL?

    Hi I made a simulation (comsol) of a piece of aluminum wire (r=1mm h=10mm) excited by 1A DC inside a sphere (r=10mm) of air. Here are the 3D plots: Since I ever only have 'seen' E&M fields depicted in textbooks and never in real life, I'm a bit surprised by the simulation result, I would at...
  35. J

    Magnetic Fields & Forces on Conductors

    Hi, Here is a multiple choice question I am stuck with and would appreciate some guidance: The mark scheme for this paper says it is option A - 0N. I didn't get that at all. If a current carrying wire is in a magnetic field with some component perpendicular to the field then how can it be...
  36. bhobba

    I Wigner's Theorem That All Fields Must Be Tensors

    I know in 1939 Wigner published a theorem that all fields must be tensors from a couple of books, but can't find the proof anywhere. That obviously is an important result so does anyone know where I can find the proof? Another I haven't seen the proof of is the no interaction theorem. I wish...
  37. M

    Propagation speed of Coulomb fields

    Moderator's note: This thread is a spin-off of https://www.physicsforums.com/threads/what-are-the-most-important-open-questions-in-classical-physics.983671/ R. de Sangro, G. Finocchiaro, P. Patteri, M. Piccolo, G. Pizzella, "Measuring propagation speed of Coulomb fields", Eur. Phys. J. C 75...
  38. B

    Finding distance between Earth and Moon in gravitational fields

    Here are 2 questions that I have tried to answer and was hoping if these are right ways to go about it? Q1) Find the distance in meters (m) between centre of the Moon and the centre of the Earth, assuming that the Moon moves in a circular orbit with a period of 27.5 days. Take the mass of the...
  39. Staticboson

    I Inertial frames in changing gravitational fields

    The man floating inside the elevator travels through space at constant velocity, and soon reaches proximity to a planet. To an outside observer, the elevator appears to change course and accelerate towards the planet, so he reasons there is a force acting on the elevator, changing its course and...
  40. W

    I Getting Used to Killing Vector Fields: Explained

    I'm struggling to get the hang of killing vectors. I ran across a statement that said energy in special relativity with respect to a time translation Killing field ##\xi^{a}## is: $$E = -P_a\xi^{a}$$ What exactly does that mean? Can someone clarify to me?
  41. SianRR

    Motion in Electric and Magnetic Fields -- (Uni Level Dynamics)

    I've attached my attempt at a solution below, I thought integrating it would be the best way to go but I'm just getting so confused and could use some help. This isn't my first attempt at a solution either I've been working on this for just under two hours now.
  42. K

    I Calculating fields in the presence of insulators

    Hello! If I have some conductors in space, each at a certain potential (and assume everything is inside a conducting sphere, in order to have some well defined boundary conditions), we can calculate the potential everywhere (inside the sphere) by solving Laplace's equation. Hence a particle...
  43. B

    Electric Fields: calculate the resultant force

    Summary:: I try to find the resultant force on "q". I think I have to find the value of Q, but I'm not sure. I Know F1 = k|q * 2Q| / 3² and F2 = k|q * Q| / 2² Hi, this is my first post on this forum I hope I posted in the right section. I try to find the resultant force on "q". I think I...
  44. J

    Conventional current, magnetic fields and magnetic poles of different diagrams

    I need to do question 1. I understand the right hand rules but am lost on what to do here.
  45. A

    Fields inside charged rings vs spherical shells

    Hi. Since you can construct shells from a series of rings, why would there be an electric field inside a single ring but not inside a shell?
  46. JuanC97

    I Do 4-divergences affect the eqs of motion for nth order perturbed fields?

    Intuitively, I'd say that adding a 4-divergence to the Lagrangian should not affect the eqs of motion since the integral of that 4-divergence (of a vector that vanishes at ∞) can be rewritten as a surface term equal to zero, but... In some theories, the addition of a term that is equal to zero...
  47. ilper

    A Why are the quantum fields considered ontological?

    Summary: The quantum fields stem from the quantum mechanical wavefunction, which in the standard QM is epistemological (amplitude of probability). How can they be then considered ontological? The quantum fields stem from the quantum mechanical wavefunction, which in the standard QM is...
  48. Ascendant78

    I Create Black Holes with Warping EM Fields: Feasible?

    As a prior physics major (had to stop at my 3rd year of undergrad due to children and financial difficulties), there was something I was always extremely passionate about - finding feasible ways to travel faster than light. Obviously, the only feasible way seems to be to bend space-time, but I...
  49. M

    Moving electron under two magnetic fields

    In this question, I would have to calculate the force in respect to time. However, the question gives me the value of the mass of the electron. In my attempt, I didn't take that into account. I just replaced ##v## with ##\frac{d}{t}## and made the Lorentz force undergone by the particle...
  50. karush

    MHB 9.2.2 AP Calculus Exam Slope Fields

    I'm just going to post this image now since my tablet won't render the latex. This is a free response question.. But my experience is that the methods of solving are more focused here at mhb saving many error prone steps.. Mahalo ahead...
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