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Home Forums Observing and Imaging Group Rainbows and other sky phenomena

This topic contains 40 replies, has 6 voices, and was last updated by  Andy Sawers 4 months, 3 weeks ago.

Viewing 11 posts - 31 through 41 (of 41 total)
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  • #9266

    Tej
    Participant
    Topics: 38
    Replies: 593

    Ah brilliant, well explained, Mike. You certainly did think it through. I feel like Marty Mcfly “you’re not thinking fourth dimensionally”…Heavy, doc.

    Its a brilliant capture now that I got the whole picture and surely one that will be hard to repeat!

    #9267

    Andy Sawers
    Moderator
    Topics: 122
    Replies: 600

    Given the forensic analysis on this forum we could do CSI Astronomy…

    #11566

    Andy Sawers
    Moderator
    Topics: 122
    Replies: 600

    Ages ago we were talking about rainbows, etc.

    This photo is, it’s claimed, a ‘hailbow’ – a rainbow effect created by curtains of hail. I found it on a website that was discussing a recent hail storm so bad it severely damaged the windscreen of an airliner and smashed the nose cone, which protects the weather radar.

    Hail bow

    #11617

    Mike Meynell
    Moderator
    Topics: 119
    Replies: 754

    This photo is, it’s claimed, a ‘hailbow’

    Is this any different to a regular rainbow, I wonder? Surely, it’s formed by the same process (sunlight interacting with a spherical raindrop), and forms in the same part of the sky (42° from the antisolar point)?

    Unless I’m missing something here?

    If it’s formed by ice crystals, then it would be a halo (22° from the Sun).

    It’s not clear from the picture whether this is a rainbow or a halo… though can I see crepuscular rays on the right hand side? If this is the case, then this is definitely a 22° solar halo.

    #11618

    Andy Sawers
    Moderator
    Topics: 122
    Replies: 600

    Nope, don’t reckon it’s fundamentally different at all. I think that it was just unusual to see a rainbow made by a curtain of chunks of ice rather than a fine mist of rain.

    #12564

    Andy Sawers
    Moderator
    Topics: 122
    Replies: 600

    Ever heard of a circumzenithal? Also known as a Bravais? What about an upside-down rainbow?

     

    • This reply was modified 2 years, 8 months ago by  Andy Sawers. Reason: typo
    #12566

    Mike Meynell
    Moderator
    Topics: 119
    Replies: 754

    Ever heard of a circumzenithal? Also known as a Bravais? What about an upside-down rainbow?

    Nice spot. They’re relatively common, by all accounts, but I’m racking my brains to remember if I’ve ever seen one.

    The, related, circumhorizontal arc is something we will rarely see in this country, as we’re too far north. It can only be seen more commonly at latitudes of less than 50-degrees from the equator. See here for some graphs on how many days per year it may be seen from different geographical locations.

    These arcs appear below the Sun, 46-degrees minimum deviation, so the Sun has to be very high… 58-degrees minimum. The arc is always parallel to the horizon. Never seen one from the UK.

    #13072

    Mike Meynell
    Moderator
    Topics: 119
    Replies: 754

    Seems to have been a spate of double rainbows over the south-east of England today, judging by the photos I’m seeing on Twitter.

    Not to be outdone, after a particularly sharp shower, I popped out into the garden to take this:

    Double rainbow over Blackheath by Mike Meynell[/url], on Flickr

    The double rainbow only lasted about 2-3 minutes, but it was quite bright at one stage.

    #14295

    Andy Sawers
    Moderator
    Topics: 122
    Replies: 600
    #14342

    Andy Sawers
    Moderator
    Topics: 122
    Replies: 600

    And now, fog bows!

    • This reply was modified 1 year, 10 months ago by  Andy Sawers.
    #17345

    Andy Sawers
    Moderator
    Topics: 122
    Replies: 600

    Rainbows and gold.

    xkcd

    • This reply was modified 4 months, 3 weeks ago by  Andy Sawers.
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