image Definition and Topics - 24 Discussions

IMAGE (Imager for Magnetopause-to-Aurora Global Exploration) is a NASA Medium Explorers mission that studied the global response of the Earth's magnetosphere to changes in the solar wind. It was believed lost but as of August 2018 might be recoverable. It was launched March 25, 2000 by a Delta II rocket from Vandenberg AFB on a two-year mission. Almost six years later, it unexpectedly ceased operations in December 2005 during its extended mission and was declared lost. The spacecraft was part of NASA's Sun-Earth Connections Program, and during its run had over 400 research articles published in peer-reviewed journals using its data. It had special cameras that provided various breakthroughs in understanding the dynamics of plasma around the Earth. The Principal Investigator was Jim Burch of the Southwest Research Institute.
In January 2018, an amateur satellite tracker found it to be transmitting some signals back to Earth. NASA made attempts to communicate with the spacecraft and determine its payload status, but has had to track down and adapt old hardware and software to the current systems. On February 25, contact with IMAGE was again lost only to be reestablished on March 4, 2018. The signal disappeared once again on August 5, 2018. Recovery efforts are underway and if successful NASA may decide to fund a restarted mission.

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  1. Boltzman Oscillation

    What is the difference between PCM and quantization?

    Summary
  2. J

    Point Charge above an Infinite Plate

    Merged thread deleted first post next post is the first post.
  3. S

    A Focal length and focus point

    First of all, Let me present some of the things I found from research. (considering convex lens) Interpretation 1 => Focal length is the distance from the center of the lens to the point where all rays converge. Interpretation2 => Focal length is the distance from the point of convergence to...
  4. navneet9431

    B Can Prism form image?

    Do Prism form image? If they do form image, then what is the nature of the image formed?
  5. navneet9431

    B Where will the image be formed?

    Suppose light rays from an object fall perpendicular to the surface of the plane mirror. Will the image be formed at +infinity(a virtual image) or -infinity(a real image)? I will be thankful for help!
  6. Akash47

    The size of the image of the Sun

    Homework Statement The focal length of a concave mirror is f=20 cm. It is directed towards the sun and the sun makes an angle= 1° at the pole of the mirror. What is the size of the image of the sun? Homework Equations 1/u +1/v =1/f .....(i) ,magnification= v/u= l2/l1 where l1 =size of the...
  7. W

    Image formed by photons

    General question regarding how images are formed. As you move your eye "detector" around a illuminated room. The is image of lets say "a book" is in every position in the room at a given time correct--even before you "look" at it? The photons reflected off the book have formed an image of the...
  8. P

    Focal Length given M and distance between obj and img

    Homework Statement The distance between an object and its upright image is 28.0 cm. If the magnification is 0.550, what is the focal length of the lens that is being used to form the image? Homework Equations 1/f = 1/so + 1/si M= -si/so The Attempt at a Solution See included image...
  9. shihab-kol

    Optics:Plane mirror and inverted image

    So,does a plane mirror(or a group of plane mirrors) ever form an inverted i.e. upside down image ? According to my own understanding, no. But in our home work this question was asked. So, is it possible??
  10. P

    A Can you generate an image to fit the following features?

    Currently I am generating an ID from an image by using K-Means to seperate brightness levels into 8 levels (clusters) and order them brightest to darkest. For each cluster I calculate: 1) Their center points as a percentage of image size (using average pixel coordinates) 2) Average distance of...
  11. Tareq Naushad

    How mirror/camera/tv work without human eye like system?

    Mirror/camera/TV etc. don't have a complex visual cortex system/perception like our eyes. Human eyes use rod,cone,neuron and above all perception of brain to make image. How come these devices create the same clear images/scenes at their surfaces by themselves without having the advance...
  12. S

    Concave mirror: Reflected rays do not meet at one point

    I have drawn a diagram of the incident and reflected rays of an object by the concave mirror. Red color shows the incident rays, black color shows the normals drawn from the center of curvature, while green color shows the reflected rays. Shouldn't all the reflected rays meet at one point. Any...
  13. S

    Image formation by convex lens

    What will happen if look at(or in the direction of) a distant object through a convex lens?
  14. Siddharth Venu

    Convex lens problem

    A screen is placed 90cm from a object. The image of the object on the screen is formed by a convex lens at two different locations separated by 30cm. The focal length of the lens is what?
  15. B

    Finding Image Distance Relative to the Eyepiece

    Homework Statement The focal length of the objective lens is 25 mm, that of the eyepiece lens is 73 mm , and the two lenses are 200 mm apart. The object is 30 mm away from the objective lens. What is the image distance relative to the eyepiece lens? What is the overall magnification of this...
  16. Alpharup

    Can I post my worked-out problems in my notebook?

    I am a self-learner using textbooks. For example, I am using Spivak Calculus. I am working out a textbook problem in my notebook or I am writing down the intricacies of the proofs in the notebook. I have the Camscanner Android app in my mobile. I take photos of my working-out and edit it using...
  17. J

    How human eye works

    I can't understand how eye actually works. From what I understand when I look at 2 objects of the same size The object that is further is smaller in the final image because light rays reflected from it take smaller surface at the retina (Here B is smaller than A because rays take less surface at...
  18. M

    Creating an image in Emacs

    Alright, so I programmed a fractal in emacs and used the terminal on my mac to compile it and it compiles and everything but it outputs the coordinates. I want to output a image from my fractal program so could you guys help me out with that? Any advice would be awesome
  19. R

    Physically what is phase of an Image?

    Hello everyone,I want to ask very basic question related to multidimentional signals like an image or a video signal. Physically what is phase of an Image? Also what is its physical significance of phase compared to magnitude of an image?
  20. C

    MATLAB Matlab STM file

    Hello everyone, I just started learning Matlab and I am trying to figure out how to image analyze an STM file. Where do I begin? Thank you, Michelle
  21. A

    Using Red Light to Reduce Effect of Ambient Light

    Hello, I have heard many times that red lighting is good for imaging applications where the effect of ambient light needs to be reduced to a minimum. What is the theory behind this? Why does red light (vs. other colors) reduce the effect of ambient light? Thank you.
  22. J

    Term to express a range of fluctuation

    I am trying to make a term for a function equipped on an image sensor. The term is to express "the upper limit of fluctuation allowance in image size which is specified in %" The value of percentage does not express the ratio of the enlarged image size compared to the original image size, so...
  23. P

    Image of a Matrix and symmetric matrix

    Hi, Well I hope it's not a thread that already is in the storage here. I want to understand the image of a matrix. not only calculating it but also why I'm doing that. Here are my questions: 1) They say d = Lx has a solution if d ∈ ImL. I know that the image of a matrix is calculated by Lx = x...
  24. P

    How to find matrix with a given image or kernel rather than vice versa?

    I'm interested in learning how to solve a relatively general sort of problem that comes up a lot in my problem sets and will presumably come up in future exams. I'm asked to give an example of a matrix or linear transformation that has a given image or kernel. Here are some examples...
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