Ha' Doppler Imaging with a P.S.T.
Image: 01
Imaging Hydrogen Alfa line is imortant to the better understanding the nature of the Solar phenomena near the Solar Corona. More important than imaging the Sun in Ha' , is to image the Sun in the near Ha' areas. That is why the Doppler imaging of the Sun in Ha' is really important.
In the image: 01 you can see a tipycal combination image of the Doppler images. Doppler Effect can saw us how spesific parts of the solar Chromosphere move and with what speed.
The importance to that is that by studying the movement and the speed of the chromospheric phenomena we can learn more about the energetic situation of the Chromosphere and how this may affect parts of the Solar Corona.
In the image: 01 you can see a tipycal combination image of the Doppler images. Doppler Effect can saw us how spesific parts of the solar Chromosphere move and with what speed.
The importance to that is that by studying the movement and the speed of the chromospheric phenomena we can learn more about the energetic situation of the Chromosphere and how this may affect parts of the Solar Corona.
How to Observe Ha' Doppler ???
Image: 02
On the image: 02 you can see a typical image of the chromosphere obtained at the facilities of the Elizabeth Observatory at 21st of Aprill 2010. This is how an active area is recorded through a Ha' filter like the P.S.T.
This is the zero speed level of the solar chromosphere. As we see the Sun in 2D most do not understand what they see through the Doppler imaging. While imaging the Sun in the "pure" Ha' line can saw us a few movements of the Sun in X'X & Ψ'Ψ axis of the 2D Sun.
But if we really like to study the Sun in 3D then it really is important to study the 3rd axis of Space (Z'Z) which can not be really seen but it can be recorded by Doppler imaging.
This is the zero speed level of the solar chromosphere. As we see the Sun in 2D most do not understand what they see through the Doppler imaging. While imaging the Sun in the "pure" Ha' line can saw us a few movements of the Sun in X'X & Ψ'Ψ axis of the 2D Sun.
But if we really like to study the Sun in 3D then it really is important to study the 3rd axis of Space (Z'Z) which can not be really seen but it can be recorded by Doppler imaging.
Tunning your System for that kind of imaging
While playing with the "Fine Tunner" of your telescope you are going to see the image of the Sun to change and different things will be revealed to you in every movement you make. The center of the Ha' line becomes vissible when you see the image with the best Contrast. Befour that and after that you observe the RED and BLUE wings of the Ha' line. To measure that you are going to need a spectrograph with high resolution behind your instrument. A verry good example of what the observer will witness is the above photo-gallery.
After measuring my system I am able to set it to multiple parts of the Ha' line starting from 6560.0 Angstrem untill the 6564.0 Angstrem. This can show us velocities from 100km/sec (towards the Earth) untill -100km/sec (moving away from Earth) with steps of 0.5 to 1.0 Angstrem.
After measuring my system I am able to set it to multiple parts of the Ha' line starting from 6560.0 Angstrem untill the 6564.0 Angstrem. This can show us velocities from 100km/sec (towards the Earth) untill -100km/sec (moving away from Earth) with steps of 0.5 to 1.0 Angstrem.
Finaly Doppler
6560.0 Angstrem
Image: 03
In the image: 03 you can see how the sun looks like at the 6560.0 Angstrem. In this part of the Ha' line every pixel you see has a speed of 100km/sec towards the Earth.
6562.8 Angstrem
Image: 04
In the image: 04 you can see the zero speed level of the Chromosphere. This is the center of the Ha' line were there is no movement in the axis conecting the Earth - Sun system. Everey movement you see in this part of the Ha' spectrum is in the 2D Sun (in the X'X and Ψ'Ψ axis).
6564.0 Angstrem
Image: 05
In the image: 05 you can see the part of the Chromosphere moving away from us with a speed of about -100km/sec.
Having the data of all the above images combined in one single image (image:01) you can create a speed map of the Solar Chromosphere and reveal a part of the Sun you haven't seen untill now. Special interest in this kind of imaging have the large prominences and filaments, also interesting and helpfull to the better understanding of how phenomena like Sunspots vissible in the Ha' are created.