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  1. #1
    Brian Tung's Avatar
    Brian Tung Guest

    Default hydrogen-alpha observing report (from Friday)



    4:10 p.m. 10 June 2005 PDT (2005-06-10-2310 UT)

    Sun was pretty active today. The most immediately noticeable feature
    was a rolling prominence on the preceding limb, like a roll of barbed
    wire, arching off the disc of the Sun. It was about 12 Earths long
    and at its tallest was probably about 3 or 4 Earths in height. (For
    reference, one Earth is a bit less than a percent of the Sun's width.)
    To its south along the limb was a short prominence, probably about an
    Earth in height. (An hour or so later, there would be three of them,
    clustered in the same place.)

    Possibly related to it was a long (maybe 15 Earths long), moderately
    dark filament, that seemed to wind toward the point on the limb where
    the little prominence was.

    There were two main sunspot groups, both near the center of the disc.
    One was a single main spot with only very tiny companions, surrounded
    by a bright plage to the south, and a modestly bright one to its north.
    Interior to these but still outside the spot were two small filaments,
    one darker one to the north of the spot, and one not so dark following
    the spot.

    That spot was somewhat to the leading side of the disc center. Closer
    to that center was the second group, consisting of one dark spot,
    followed by one small spot and a third spot, only modestly dark. They
    were all followed by a small faintly dark area (but not a spot).

    On the following limb of the disc were three sets of prominences. The
    northernmost was a tall jet, perhaps 8 or so Earths in height, with a
    secondary jet to its north, starting at about 4 Earths in altitude and
    also extending upward. To the south of this pair were 3 or 4 jets in
    a group, fainter, starting from about 3 Earths in altitude and reaching
    upward by another 3 Earths. Finally, the southernmost group was a
    small bunch, perhaps 3 Earths in height at its northern edge and fading
    downward toward its southern edge, a few Earths away.

    Seeing was mediocre for daytime, probably about 3 arcseconds and fast.
    One measure of the transparency was that the sky reached about half its
    maximum saturation of blue about 30 degrees from the Sun.

    Brian Tung <brian@isi.edu>
    The Astronomy Corner at http://astro.isi.edu/
    Unofficial C5+ Home Page at http://astro.isi.edu/c5plus/
    The PleiadAtlas Home Page at http://astro.isi.edu/pleiadatlas/
    My Own Personal FAQ (SAA) at http://astro.isi.edu/reference/faq.txt

  2. #2
    Larry Stedman's Avatar
    Larry Stedman Guest

    Default hydrogen-alpha observing report (from Friday)

    Nice report... with good detail.

    Did you observe the sunspots only with H-alpha or also a white light
    filter?

    What was the scope/filter combination you were using?

    It's been HOT, hazy, cloudy, and humid in upstate NY... not great sun
    gazing weather.

    Larry Stedman
    Vestal

  3. #3
    Brian Tung's Avatar
    Brian Tung Guest

    Default hydrogen-alpha observing report (from Friday)

    Larry Stedman wrote:

    At one end of the tuning, the filter behaves more or less as a white
    light filter (although the spots still don't show up quite as large as
    they do in a white light filter). I started there, but only glanced
    at the disc before moving to the center of the passband.


    Heh, weren't you there? Sorry about leaving that out. It's a Tele
    Vue Ranger, a 70 mm refractor, stopped to 40 mm with the Coronado
    SolarMax 40 filter set. I do get a few dropped jaws when I mention
    that the filter set cost me almost four times as much as the scope
    (which I bought used). I usually mention the PST afterward, though,
    and some people get a curious, excited look on their faces...

    Brian Tung <brian@isi.edu>
    The Astronomy Corner at http://astro.isi.edu/
    Unofficial C5+ Home Page at http://astro.isi.edu/c5plus/
    The PleiadAtlas Home Page at http://astro.isi.edu/pleiadatlas/
    My Own Personal FAQ (SAA) at http://astro.isi.edu/reference/faq.txt

  4. #4
    Larry Stedman's Avatar
    Larry Stedman Guest

    Default hydrogen-alpha observing report (from Friday)

    Thanks, Brian. (I was there in spirit only...) Sounds like a winning
    combo... the PST gives pretty amazing views, too. I've seen a great
    prominence photo with Earths put in to show the scale and SIZE of the
    outbursts. Pretty amazing.

    Larry Stedman
    Vestal

 

 

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