#全球天文月# 太阳日
SunDay: Observing the Sun with the World’s Largest Solar Telescope
When: Apr 25, 2021 from 5:00 PM to 7:00 PM (UTC)
In celebration of Global Astronomy Month's annual SunDay join our guest speakers Claire Raftery and John Williams from the National Solar Observatory in Boulder, Colorado as they delve into the details from the worlds highest resolution image of the Sun. The Inouye Solar Telescope is the worlds largest, and is set to start operations later this year. They will discuss the challenges of focusing a 4-meter solar telescope, and review different solar features and how best to observe them from home.
Check out more information on the National Solar Observatory （ https://t.cn/A6cWszcr ）
SunDay: Observing the Sun with the World’s Largest Solar Telescope
When: Apr 25, 2021 from 5:00 PM to 7:00 PM (UTC)
In celebration of Global Astronomy Month's annual SunDay join our guest speakers Claire Raftery and John Williams from the National Solar Observatory in Boulder, Colorado as they delve into the details from the worlds highest resolution image of the Sun. The Inouye Solar Telescope is the worlds largest, and is set to start operations later this year. They will discuss the challenges of focusing a 4-meter solar telescope, and review different solar features and how best to observe them from home.
Check out more information on the National Solar Observatory （ https://t.cn/A6cWszcr ）
☔️️｜写给星星的情书｜☔️️
我有一颗星星
她距离我420光年
我想给她 全宇宙的宠爱
@THE9-刘雨昕
给✨✨的匣子：
《昕河以赠·终章》
https://t.cn/A6cpR5pR
《昕河以赠·序曲》
https://t.cn/A6tdc2fQ
《她说》
https://t.cn/A6c5dxNs
《宠爱》
https://t.cn/A6cC0ahZ
「花信计划·题诗」
https://t.cn/A6cWTlKL
「2.14KP·朝暮思君」
https://t.cn/A6cWTlKU
「4.20KP·隔空相聚」
https://t.cn/A6cWTlKy
《光》
https://t.cn/A6qla0TN
「花信生辰·合集」
https://t.cn/A6cNx2YT
《寻昕启示》
https://t.cn/A6GuNdk6
《小日斤&滚滚们的一天》
https://t.cn/A6GCMw0w
我有一颗星星
她距离我420光年
我想给她 全宇宙的宠爱
@THE9-刘雨昕
给✨✨的匣子：
《昕河以赠·终章》
https://t.cn/A6cpR5pR
《昕河以赠·序曲》
https://t.cn/A6tdc2fQ
《她说》
https://t.cn/A6c5dxNs
《宠爱》
https://t.cn/A6cC0ahZ
「花信计划·题诗」
https://t.cn/A6cWTlKL
「2.14KP·朝暮思君」
https://t.cn/A6cWTlKU
「4.20KP·隔空相聚」
https://t.cn/A6cWTlKy
《光》
https://t.cn/A6qla0TN
「花信生辰·合集」
https://t.cn/A6cNx2YT
《寻昕启示》
https://t.cn/A6GuNdk6
《小日斤&滚滚们的一天》
https://t.cn/A6GCMw0w
花花送给你~~ MATLAB Code
n=800;
r=linspace(0,1,n);
theta=linspace(0,2*pi,n);
[R,THETA]=ndgrid(r,theta);
% define the number of petals we want per cycle. Violets have 5!
petalNum=5;
x = 1 - (1/2)*((5/4)*(1 - mod(petalNum*THETA, 2*pi)/pi).^2 - 1/4).^2;
% update the formula for phi to stop the spiralling effect
phi = (pi/2)*exp(-2*pi/(8*pi));
y = 1.95653*(R.^2).*(1.27689*R - 1).^2.*sin(phi);
R2 = x.*(R.*sin(phi) + y.*cos(phi));
X=R2.*sin(THETA);
Y=R2.*cos(THETA);
Z=x.*(R.*cos(phi)-y.*sin(phi));
% color code for blueviolet RGB 138,43,226
% Indigo rgb value (75,0,130)
mapSize=20;
blue_map=linspace(138,75,mapSize)';
blue_map(:,2)=linspace(43,0,mapSize)';
blue_map(:,3)=linspace(226,130,mapSize)';
% and a pretty bit in the middle
gold_map=[255 215 0; 250 210 0];
% combine to form a full flower map
violet_map=[gold_map; blue_map];
% Now lets plot it and try and pick an attractive angle
surf(X,Y,Z,'LineStyle','none')
colormap(violet_map/255)
view([-12.700 81.200])
n=800;
r=linspace(0,1,n);
theta=linspace(0,2*pi,n);
[R,THETA]=ndgrid(r,theta);
% define the number of petals we want per cycle. Violets have 5!
petalNum=5;
x = 1 - (1/2)*((5/4)*(1 - mod(petalNum*THETA, 2*pi)/pi).^2 - 1/4).^2;
% update the formula for phi to stop the spiralling effect
phi = (pi/2)*exp(-2*pi/(8*pi));
y = 1.95653*(R.^2).*(1.27689*R - 1).^2.*sin(phi);
R2 = x.*(R.*sin(phi) + y.*cos(phi));
X=R2.*sin(THETA);
Y=R2.*cos(THETA);
Z=x.*(R.*cos(phi)-y.*sin(phi));
% color code for blueviolet RGB 138,43,226
% Indigo rgb value (75,0,130)
mapSize=20;
blue_map=linspace(138,75,mapSize)';
blue_map(:,2)=linspace(43,0,mapSize)';
blue_map(:,3)=linspace(226,130,mapSize)';
% and a pretty bit in the middle
gold_map=[255 215 0; 250 210 0];
% combine to form a full flower map
violet_map=[gold_map; blue_map];
% Now lets plot it and try and pick an attractive angle
surf(X,Y,Z,'LineStyle','none')
colormap(violet_map/255)
view([-12.700 81.200])
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