High Altitude Hazes

By Candy on 2017-12-28 UT

Our first PJ1 images showed a high altitude cloud extending above the terminator.  Other images show bands of haze.


  1. comment by Maquet-80 on 2020-02-12 16:47 UT

    Attached is a more detailed description of how to find the limb in an image, how to rectify it, and how to get an idea about the structure of the hazes along the limb.

  2. comment by Philosophia-47 on 2018-09-25 22:10 UT

    Here is our abstract for my talk given at the EPSC in Berlin in 2018 September, summarising the main patterns of haze bands in both hemispheres:

    'Jupiter’s high-latitude hazes as mapped by JunoCam'

  3. comment by Maquet-80 on 2018-08-11 13:53 UT

    The subcomments of this comment will be used for a more complete survey of Jupiter's limb. The rectification algorithm is refined, and uses the mean brightness of the zone of the steepest brightness slope as a definition for limb.

    Attached is a PJ12 survey. Considered are only close-up RGB images with the terminator outside the field of view.

    • comment by Maquet-80 on 2018-08-11 13:56 UT

      Limb surveys for PJ12, PJ13, and PJ14.

    • comment by Maquet-80 on 2018-08-14 14:03 UT

      Limb surveys for PJ09, PJ10, and PJ11.

    • comment by Maquet-80 on 2018-11-26 22:48 UT

      Limb surveys for PJ15 and PJ16.

    • comment by Maquet-80 on 2019-03-05 14:38 UT

      Limb surveys for PJ17 and PJ18.

    • comment by Maquet-80 on 2020-02-10 14:38 UT

      Limb surveys for PJ01 to PJ08

    • comment by Maquet-80 on 2020-02-10 14:43 UT

      Limb surveys for PJ19 to PJ23.

      Note, that all PJ19 images are south polar outbound. 

  4. comment by Maquet-80 on 2018-08-11 01:45 UT

    In PJ12, image #87, there is a section of a limb showing two layers of presumably detached haze. This might hint towards four stacked separate weather systems, three of which forming their own inversion layer. On Earth, inversion layers form when warm air is layered above cold air. For Jupiter, it's usually assumed, that temperature is decreasing with altitude. This assumption would suggest hazes of different chemical composition resublimating for specific temperature and pressure conditions, which gradually change with altitude. 

  5. comment by Maquet-80 on 2018-08-05 17:05 UT

    A more complete survey of the Jupiter's limb during PJ14.

    • comment by Maquet-80 on 2018-08-05 17:09 UT

      And here a survey of the first derivative (difference quotients) of the square-root encoded PJ14 limb profiles.

  6. comment by Maquet-80 on 2018-08-04 14:27 UT

    Here a crop of the brightness gradient, where a detached haze layer occurs.

  7. comment by Maquet-80 on 2018-08-04 14:25 UT

    The attached zip file shows an approach to analyse Jupiter's haze layer by observing the limb.

    is a draft processing of Perijove 14 image #23, JNCE_2018197_14C00023_V01.

    The green lines in image file
    show the automatically detected limb.

    This limb is used for the limb rectification shown in image file

    Along vertical sections of this rectified view, brightness values can be plotted into diagrams like indicated in file

    The first derivative of the brightness plot shows the structure of the haze layer more distincly. This is shown in file

    The same method can be applied for each of the three color channels separately:

    A large number of sections can be visualized by compiling the diagrams into a movie:

    Note especially the time between 00:15 and 0:35, where there is forming a detached haze layer. But also continuous appearing haze can vary in its brightness gradient.

  8. comment by Philosophia-47 on 2018-04-28 10:52 UT

    For an account of the hazes at PJ12, including a remarkable map of the northern hemisphere hazes seen at high phase angle, please see Part I of the report I've posted on the PJ12 thread.

    --John Rogers.