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2012 Jan 28 Sun - East limb Eruption flare

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發表於 2012-2-11 23:27:50 | 顯示全部樓層 |閱讀模式
本帖最後由 PTS 於 2012-2-11 23:44 編輯

Hi,
Here is a subset of the sequence of eruption flare on the east limb of the solar disc on Jan 28, 2012, from ~12:30 to ~16:00.

Telescope: Astrophysics Starfire EDT 155mm f/9, with 4X telecentric lens (f/36)
Filter: Solar Spectrum SO1.5/0.3A, with Baader CERF prefilter
Camera: Imperx 4M15.

note the time stamp given by the filename:
ayyyymmddhhmmsssss

yyyy=2012
mm=01
dd=28
hh=hour
mm=minute
sssss=second and millisecond


pts
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發表於 2012-2-12 08:44:15 | 顯示全部樓層
Just interested to know how do you know it's a solar flare instead of a straight pillar prominence?
 樓主| 發表於 2012-2-12 10:58:29 | 顯示全部樓層
本帖最後由 PTS 於 2012-2-12 11:00 編輯

回復 2# oldfield

Firstly, I use the term flare liberally with no specific physical meanings.  Secondly, if you inspect the images closely, especially near the limb, you'll see many flare-like changes.  In comparison, the "pillar" did not change that much.

I have more than 300 images for this event, and just select a few for posting here (you do not expect me to put them all here as single frames, do you?)

I am now processing another set of "flare" images (this set should really be called prominences as it is a complicated loop structure) take on the same day (Jan 28) but on the western limb.  There are more than 1600 frames lasting over 4 hours, and changes are by the minute.  I am seriously considering how to make it into a "movie clip", but it seems I don't know how.

pts
發表於 2012-2-12 16:33:52 | 顯示全部樓層
thank you for your clarifications.
發表於 2012-2-13 00:40:46 | 顯示全部樓層
回復 2# oldfield
要了解是耀斑還是日珥,可以對比 SOHO EIT 與上述照片拍攝當日及前一日和後一日該位置的太陽活動變化便可知道。有時日珥的形態描述亦因出現時與觀測者相對位置有不同 (見下圖) 而有分別。

發表於 2012-2-13 10:17:02 | 顯示全部樓層
回復  oldfield
要了解是耀斑還是日珥,可以對比  與上述照片拍攝當日及前一日和後一日該位置的太陽活動變 ...
WCYue 發表於 2012-2-13 00:40


Agree... I just wonder how pts could judge simply from those shots.
 樓主| 發表於 2012-2-19 11:46:59 | 顯示全部樓層
回復 6# oldfield

It is difficult to tell a flare from a single image.  You must follow the active region for some time.
See this post:
http://www.hkastroforum.net/viewtopic.php?t=24113
and this:
http://www.scholarpedia.org/article/Solar_Activity

You can see flare and filament or even prominence are closely related.
Surely from limb images, it is difficult to tell the occurrence of a flare.  However, the changes in the morphology and motion of the plasma, there should definitely be some flare acitivity.

pts
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