arjan
New Member
Posts: 14
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Post by arjan on Feb 27, 2011 18:46:12 GMT
Thanks Dr Svalgaard. That makes it perfectly clear. So i did miss something completely  Earth's north is actually a magnetic southpole. Now it makes sence. |
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Post by lsvalgaard on Feb 27, 2011 22:10:39 GMT
Thanks Dr Svalgaard. That makes it perfectly clear. So i did miss something completely Earth's north is actually a magnetic southpole. Now it makes sence. Yes, we define the Earth's northern magnetic pole as that which attracts the north pole of a compass needle, hence that northern magnetic pole must have south polarity. |
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Post by sigurdur on Feb 28, 2011 2:34:30 GMT
Thanks Dr Svalgaard. That makes it perfectly clear. So i did miss something completely Earth's north is actually a magnetic southpole. Now it makes sence. Yes, we define the Earth's northern magnetic pole as that which attracts the north pole of a compass needle, hence that northern magnetic pole must have south polarity. Till they switch......correct? Do I understand that there have been times that the polarity of the poles has switched 180 degrees in a short time span? And if that is correct, what causes the switch? |
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Post by lsvalgaard on Feb 28, 2011 2:59:07 GMT
Yes, we define the Earth's northern magnetic pole as that which attracts the north pole of a compass needle, hence that northern magnetic pole must have south polarity. Till they switch......correct? Do I understand that there have been times that the polarity of the poles has switched 180 degrees in a short time span? And if that is correct, what causes the switch? Geologocally short, long in human terms [thousands of years]. The dynamo that produces the field actually produces a very complicated pattern of magnetic fields in the core. It is only when looked at the great distance of thousands of kilometers that the resulting field looks dipolar. |
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Post by elbuho on Mar 3, 2011 22:51:19 GMT
Dear Dr. Are we enter in solar maximum?  Thanks. |
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Post by mancow on Mar 4, 2011 0:10:35 GMT
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Post by lsvalgaard on Mar 4, 2011 0:55:56 GMT
Dear Dr. Are we enter in solar maximum? The maximum may only be a year or at most two away if my speculation about the polar fields are halfway correct, but right now that is just a WAG. Weak cycles have very erratic behavior, e.g. cycle 14:  |
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Post by uwe2358 on Mar 5, 2011 11:01:45 GMT
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Post by lsvalgaard on Mar 5, 2011 15:15:16 GMT
It is a planet. Mercury I think. The other bright object is Mars. The 'lines' through the objects are instrumental saturation. |
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Post by uwe2358 on Mar 6, 2011 13:32:58 GMT
It is a planet. Mercury I think. The other bright object is Mars. The 'lines' through the objects are instrumental saturation. Thank you very much , that puts a lot of speculation to rest even though the ' lines ' are a very intriguing aspect and seem to affect only Mars in such a prominent way |
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bradk
Level 3 Rank
Posts: 199
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Post by bradk on Mar 6, 2011 13:54:53 GMT
uwe2358- Here is a discussion of blooming and the type of exuipment used on SOHO and the SDO, www.badastronomy.com/bad/misc/planetx/soho.htmlThe lines are caused by the same effect you would have if you took a picture with a long exposure of any other bright object, saturation of the light gathering entity. |
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Post by jcarels on Mar 6, 2011 15:11:06 GMT
Thank you very much , that puts a lot of speculation to rest even though the ' lines ' are a very intriguing aspect and seem to affect only Mars in such a prominent way The object with the lines is Mercury. The one to the right is Mars. Mercury is closer to the sun (and the spacecraft), so it is brighter. Thats the reason why it has "lines". |
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Post by lsvalgaard on Mar 6, 2011 21:04:28 GMT
Thank you very much , that puts a lot of speculation to rest even though the ' lines ' are a very intriguing aspect and seem to affect only Mars in such a prominent way The object with the lines is Mercury. The one to the right is Mars. Mercury is closer to the sun (and the spacecraft), so it is brighter. Thats the reason why it has "lines". Very bright objects saturate or overload the detector [which was designed to detect weak emission from the corona]. The overload causes the lines, because the image is the result of the sky being scanned in lines back and forth. |
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Post by skypilot on Mar 7, 2011 16:35:51 GMT
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Post by walterdnes on Mar 8, 2011 3:06:17 GMT
Was that an instrument problem at Penticton, or did we have one bleep of a powerful flare today?
20110307 170000 2455628.197 2107.702 0151.9 0149.6
20110307 200000 2455628.322 2107.707 0938.6 0924.4
20110307 230000 2455628.447 2107.711 0162.3 0159.9
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Earth's north is actually a magnetic southpole. Now it makes sence.
