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Re: xrt_co: - Draft proposal
Sorry, I actually used 15 m/sec in the calculation; I just mistyped it
in my message. The motion is ~15 m/sec X 86,000 sec per day, so it's
15X86 km = 1290 km per day.
Ed Deluca wrote:
> The meridional circulation is ~15m/s not 15km/s!!
>
> This is going to be hard to see.
>
> Ed
> On Aug 20, 2008, at 4:01 PM, Leon Golub wrote:
>
>> Ed
>>
>> OK, our visitor has given me his A&A paper, so this is a follow-up on
>> my previous message. (Sorry about sending that to everybody; I hit the
>> wrong button.) Again, I would think that you should stay away from the
>> 7-day lifetime regions, even though they may not rotate with a
>> different differential coefficient. They will, however, become fairly
>> large, so that defining their location might become difficult.
>>
>> So, what can you do with one-day lifetime regions? At a speed of 15
>> km/sec, the latitudinal motion will amount to about 1300 km per day.
>> That's about 2 arcsec, and I think is probably about equal to the best
>> you could expect in terms of locating a central position for each XBP.
>> That's not so terrible if you measure, say, 100 of them and figure
>> that the statistics go as N^1/2. I'd say you have a chance of succeeding.
>>
>>
>> By the way, you will only have a few 1-day regions regions each day.
>> If you go for 2-day regions (might as well, while you're at it) there
>> won't be many of them.
>>
>> Leon
>>
>>
>> Ed Deluca wrote:
>>> Attached is a draft proposal for a set of observations designed to
>>> measure the
>>> meridional circulation from XBPs. It is a difficult and time
>>> consuming task,
>>> so please review and comment on the feasibility and science value. If
>>> we think this is worthwhile I will present it to the SSC in September.
>>> Ed
>>> ------------------------------------------------------------------------
>>> ===================================================================
>>> Dr. Edward E. DeLuca Smithsonian Astrophysical
>>> Observatory
>>> edeluca@cfa.harvard.edu MS 58
>>> Office 617 496 7725 60 Garden Street
>>> Fax 617 496 7577 Cambridge, MA 02138
>>> Cell 508 728 5424 USA
>>> ===================================================================
>>
>> --
>>
>>
>> ***********************************************************
>> Dr. Leon Golub; Harvard-Smithsonian Center for Astrophysics
>> 60 Garden Street, Cambridge MA 02138
>> Ph: 617 495 7177; Fax: 617 496 7577
>> e-mail: lgolub@cfa.harvard.edu
>> http://hea-www.harvard.edu/~golub/HomePage.html
>> ***********************************************************
>
--
***********************************************************
Dr. Leon Golub; Harvard-Smithsonian Center for Astrophysics
60 Garden Street, Cambridge MA 02138
Ph: 617 495 7177; Fax: 617 496 7577
e-mail: lgolub@cfa.harvard.edu
http://hea-www.harvard.edu/~golub/HomePage.html
***********************************************************