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Stargazing For those aurora chasers -- a heads up

  1. Oct 19, 2017 #41

    davenn

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    well sadly the geo storming and aurora didn't eventuate

    But there are 2 other coronal holes that may cause some activity over the net 2 to 6 days respectively
     
  2. Oct 19, 2017 #42

    davenn

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    a chance for more activity

    from Spaceweather.com

    CO-ROTATING INTERACTION REGION: NOAA forecasters estimate a 55% chance of polar geomagnetic storms on Oct. 21st when a co-rotating interaction region (CIR) is expected to hit Earth's magnetic field. CIRs are transition zones between fast- and slow-moving solar wind streams. Solar wind plasma piles up in these regions, producing density gradients and shock waves that do a good job of sparking auroras.

    keep an eye on the skies :smile:


    Dave
     
  3. Oct 21, 2017 #43

    davenn

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    And yet some more probable activity in several days
    with a reasonably large coronal hole now in a geo-effective position

    171021 coronal hole1.jpg


    Dave
     
  4. Oct 22, 2017 #44
    The aurora for the last couple of nights has been present, but relatively weak. I live at latitude 61.5°N, so I get a pretty good view on clear nights.

    Live_10202017042321-XL.jpg

    Live_10212017001828-XL.jpg

    Source: The Aurora Chasers, Alaska Aurora Cam.com
     
  5. Oct 29, 2017 #45

    davenn

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    heads up for the high latitude dwellers :smile:

    there's a reasonable sized coronal hole that is now geo-effective
    It's effects should be felt in around 2 - 3 day (~ 1 - 2 of Nov)

    20171030 CH.JPG

    Dave
     
  6. Nov 8, 2017 #46

    DrClaude

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    Finally got to see some northern lights yesterday evening! I'll try to post a picture later.
     
  7. Nov 8, 2017 #47

    DrClaude

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    Not the best picture ever, but proof of what I saw...
    DSCN9881.jpg
     
  8. Nov 8, 2017 #48

    davenn

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    awesome, better than nothing, well done :smile:
    continue to keep a look out over the next couple of days. The coronal hole responsible for the current burst of activity
    is an elongated one and so should provide extended period of auroral activity

    as far as your camera settings go ( not knowing what they were) ... some considerations

    open aperture as wide as possible for the lens you are using .... eg f2.8, 3.5 not way up the other end f10, 13 etc
    up the ISO setting try around 800 to 1600
    and finally an exposure of around 10 seconds

    those settings should get more light captured :smile:


    Dave
     
    Last edited: Nov 8, 2017
  9. Nov 8, 2017 #49

    davenn

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    latest released geomagnetic alert

    SUBJ: SWS GEOMAGNETIC DISTURBANCE WARNING 17/55
    ISSUED AT 2313UT/08 NOVEMBER 2017
    BY THE AUSTRALIAN SPACE FORECAST CENTRE.

    The Earth is currently under the influence of high speed solar
    wind streams associated with the recurrent coronal hole. On the
    subsequent two days (9-10 November) Active to Major Storm conditions
    may occur provided IMF Bz will turn southward for a prolonged
    period.

    INCREASED GEOMAGNETIC ACTIVITY EXPECTED
    DUE TO CORONAL HOLE HIGH SPEED WIND STREAM
    FROM 09-10 NOVEMBER 2017
    _____________________________________________________________

    GEOMAGNETIC ACTIVITY FORECAST
    09 Nov: Storm Levels
    10 Nov: Active

    that's Nov 9 and 10 UT dates
    and my usual comment
    "tho released by the AUSTRALIAN SPACE FORECAST CENTRE.
    it is applicable for both northern and southern hemispheres"



    Dave
     
  10. Nov 9, 2017 #50

    DrClaude

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    The problem is that my main camera wouldn't turn on (hope it was just an empty battery), so I had to use a point-and-shoot instead. Also, I took pictures from my backyard, not the best view (hence the trees in the picture) and had to find a spot of sky where I would not catch any artificial light.
     
  11. Nov 12, 2017 #51

    davenn

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    2017-11-12 and the is exiting a solar wind stream that caused a number of nights of aurora for high latitude observers on both nthrn and sthrn hemispheres.
    But the respite will be brief and 2 new coronal holes are going to cause another number of days of activity. This is likely to start around the 14th of Nov.

    1171112 coronal holes.JPG
     
  12. Nov 15, 2017 #52

    davenn

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    The 2 coronal hole regions shown above didn't produce any significantly large auroral displays.

    In another 24 hours another, this time centrally located coronal hole may have a better chance in producing some
    higher speed solar wind and resulting in better auroral displays ... we live in hope :biggrin:

    that burst of faster solar wind should arrive around the 18 - 19th Nov. ..... stay tuned :smile:



    Dave
     
  13. Dec 16, 2017 #53

    davenn

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    Aurora alert for those in high latitudes, 45 or greater deg N or S

    My usual comment ... tho this is from a Southern Hemisphere warning centre, it is applicable to both nthrn and sthrn hemispheres

    SWS GEOMAGNETIC DISTURBANCE WARNING 17/61
    ISSUED AT 2258UT/15 DECEMBER 2017
    BY THE AUSTRALIAN SPACE FORECAST CENTRE.

    A high speed stream from a recurrent positive equatorial coronal
    hole is expected to start affecting earth from UT day 17 Dec.
    The geomagnetic activity is expected reach active levels on UT
    day 17 and 18 December and at times may reach up to minor storm
    levels. There is some possibility that aurora may be visible
    on the local night of 17 December from Tasmania and southern
    parts of Victoria, Australia.

    INCREASED GEOMAGNETIC ACTIVITY EXPECTED
    DUE TO CORONAL HOLE HIGH SPEED WIND STREAM
    FROM 17-18 DECEMBER 2017
    _____________________________________________________________

    GEOMAGNETIC ACTIVITY FORECAST
    17 Dec: Active
    18 Dec: Unsettled

    Space Weather Services email: asfc@bom.gov.au
    Bureau of Meteorology
    PO Box 1386 WWW: http://www.sws.bom.gov.au
    Haymarket NSW 1240 AUSTRALIA FTP: ftp://ftp-out.sws.bom.gov.au
    tel: +61 2 9213 8010 fax: +61 2 9213 8060
     
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