19 ms·

Can anyone find a scale for the photo? How big is this vortex?

bookofjoe 3y ago
>First Direct Imaging of a Kelvin–Helmholtz Instability by PSP/WISPR https://iopscience.iop.org/article/10.3847/1538-4357/ad2208 https://iopscience.iop.org/article/10.3847/1538-4357/ad2208 >To characterize the spatial scales involved (e.g., radial size, width, and separation of the eddies) we use exclusively observations from WISPR-I, the only instrument where the eddies were discernible. >From the GCS reconstruction, we estimated that the CME propagated radially in a direction with a Carrington longitude of 20° and latitude of 10°. >Since all the features exhibited a rather elliptical shape, to characterize the typical scales involved, we measured the length of the major and minor axes (the major axis is along the propagation direction, while the minor axis is perpendicular to this direction). > From the time-lapse considered, we estimate that the lifetime of the eddies (i.e., the temporal period) is less than 30 minutes. >Table 1. Average Sizes (in Mm) of the Minor (top row) and Major (lower row) Axis of Observed Eddies https://iopscience.iop.org/0004-637X/964/2/139/suppdata/apjad2208t1_ascii.txt?doi=10.3847/1538-4357/ad2208 https://iopscience.iop.org/0004-637X/964/2/139/suppdata/apja... https://content.cld.iop.org/journals/0004-637X/964/2/139/revision1/apjad2208t1_lr.gif https://content.cld.iop.org/journals/0004-637X/964/2/139/rev... https://content.cld.iop.org/journals/0004-637X/964/2/139/revision1/apjad2208f6_lr.jpg https://content.cld.iop.org/journals/0004-637X/964/2/139/rev...
- Levitating 3y ago
  ELI5?
  - deleted 3y ago
    [deleted]
  - jeroenhd 3y ago
    Average sizes seem to range from 36000km to 174000km. For reference: the earth is almost 13000km in diameter.
    - JumpCrisscross 3y ago
      3 to 13 Earth diameters.
bregma 3y ago
Unfortunately the banana froze and carbonized at the same time.
- justinclift 3y ago
  It's probably need a very large number of bananas to even show up as a pixel in the video. :)

>First Direct Imaging of a Kelvin–Helmholtz Instability by PSP/WISPR https://iopscience.iop.org/article/10.3847/1538-4357/ad2208 https://iopscience.iop.org/article/10.3847/1538-4357/ad2208 >To characterize the spatial scales involved (e.g., radial size, width, and separation of the eddies) we use exclusively observations from WISPR-I, the only instrument where the eddies were discernible. >From the GCS reconstruction, we estimated that the CME propagated radially in a direction with a Carrington longitude of 20° and latitude of 10°. >Since all the features exhibited a rather elliptical shape, to characterize the typical scales involved, we measured the length of the major and minor axes (the major axis is along the propagation direction, while the minor axis is perpendicular to this direction). > From the time-lapse considered, we estimate that the lifetime of the eddies (i.e., the temporal period) is less than 30 minutes. >Table 1. Average Sizes (in Mm) of the Minor (top row) and Major (lower row) Axis of Observed Eddies https://iopscience.iop.org/0004-637X/964/2/139/suppdata/apjad2208t1_ascii.txt?doi=10.3847/1538-4357/ad2208 https://iopscience.iop.org/0004-637X/964/2/139/suppdata/apja... https://content.cld.iop.org/journals/0004-637X/964/2/139/revision1/apjad2208t1_lr.gif https://content.cld.iop.org/journals/0004-637X/964/2/139/rev... https://content.cld.iop.org/journals/0004-637X/964/2/139/revision1/apjad2208f6_lr.jpg https://content.cld.iop.org/journals/0004-637X/964/2/139/rev...

Levitating 3y ago
ELI5?
- deleted 3y ago
  [deleted]
- jeroenhd 3y ago
  Average sizes seem to range from 36000km to 174000km. For reference: the earth is almost 13000km in diameter.
  - JumpCrisscross 3y ago
    3 to 13 Earth diameters.

bregma 3y ago

Unfortunately the banana froze and carbonized at the same time.

justinclift 3y ago
It's probably need a very large number of bananas to even show up as a pixel in the video. :)