越障: 16'01'' christeen改一下原文吧,有一大部分文字反复出现了一次....
(容我照着笔记写)
99549
Scope: solar magnetic/activity cycle
MI: new finding (suggested by recent 2 studies):
asymmetry in the reversal of solar magnetic field
Background:solar cycle: 11 years
association: It is well known that the flip of solar magnetic field coincides with maximum of solar activity, called "solar max"
New finding: ASYMMETRYNow, the mag at N pole is close to 0, whereas the mag at S pole just begin to decrease.
WHY? no one knows.
The new finding comes from two recently-published studies:
#1. H study (done in Japan): use a Solar Optical Telescope to look at the
magnetic field DIRECTLY#2. a new method:
use microwave to track changes in magnetic fieldCharacteristic of the two studies:
1. they
share the same assumption as said above: It is well known that the flip of solar magnetic field coincides with maximum of solar activity, called "solar max"
2. they agree that the magnetic switch is imminent at N pole, which is far earlier than the expected "solar max" at 2013
3. Especially suggested in #1 study, other models are in need
(now the author goes into details)
Challenge - when we look at the Sun from earth, we mainly focus on the equator, and thus we have difficulties to precisely know what happens at the poles.
How to overcome this challenge? two studies have two different approaches.
in #1, map the magnetic field using a specific Telescope
in #2, (indirect approach) measure microwaves
This is an application of a 2003 discovery, which established the correlation:
as solar activity is going from the lowest to the zenith, the so-called P eruption moves from equator to pole.
According to G, the scholar who lead this study, their results were (as above mentioned): Now, the mag at N pole is close to 0, whereas the mag at S pole just begin to decrease.
(then the author comes back to #1 study)
This study was carried out in Japan, and the result was ground-breaking.
cite a comment from a scientist: this is the
1st direct evidence that magnetic field reversal is asymmetrical.
According to T, a scientist in Palo Alto, California (I remember this because it's close to where I live
), this study is astonishing! Scientists need to come up with new model to explain this, to significantly modify our current models.
-- by 会员 babybearmm (2012/4/25 10:52:08)