Re: xrt_co: - Draft proposal

[Ed Deluca <edeluca@cfa.harvard.edu>]

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
>> ===================================================================
>
> -- 
>
>
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> Dr. Leon Golub; Harvard-Smithsonian Center for Astrophysics
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