Solar Ultraviolet Imaging Telescope (SUIT): Instrument on board Aditya-L1 Spacecraft has successfully captured the first full-disk images of the Sun in 200-400 nm Wavelength range SUIT captures images of the Sun's Photosphere and Chromosphere in this wavelength range using various Filters 20 November 2023: SUIT payload was powered ON Successful pre-commissioning phase 6 December 2023: SUIT captured its first light science images Images: Taken using 11 different Filters (Slide 4), include the first-ever full-disk representations of the Sun in Wavelengths ranging from 200 to 400 nm, excluding Ca II h Notable Features: Sunspots, Plage (Chromosphere variant of Faculae), Limb Darkening, and Quiet Regions of Sun, as marked in Mg II h image (Slide 7), provide scientists with insights into the intricate details of Sun's Photosphere and Chromosphere SUIT observations will help scientists study the dynamic coupling of magnetized solar atmosphere and assist them in determining the effects of solar radiation on Earth's climate DISCLAIMER All material (Text, Images, Graphics etc.) in these slides have been procured from publicly available sources of ISRO and other agencies, which includes ISRO partners. There are selected images from NASA also, where relevant, also procured from freely available public resources. Instead of individually acknowledging each image they have been collectively credited through this Disclaimer page. The author makes no copyright claims on any material. They have been sorted, edited as relevant, collated and inserted to align them with the sequence of the slides, as deemed fit by the author. They have been posted with academic altruism in mind, for those interested in Astrophysics and Astronomy and related technology, like the author. There is no commercial or promotional motivation involved anywhere. The author is not an Astrophysicist or an Astronomer. The author does not work for ISRO, NASA or any tech company. The author is a nerd who loves technology, Astrophysics and Astronomy and who dabbles in related developments of ISRO, NASA etc. during his spare time as an intellectual hobby. Thus, he satiates his academic appetite, learns in the process and wishes to share them with like-minded people. At the time of publication, all material has been updated and is deemed to be accurate. If any errors are detected by the reader(s), I shall be happy to be corrected. The responsibility for any errors are solely mine and not that of the parent organizations. Here’s is wishing everyone a happy armchair space exploration on this occasion of New Year 2024!

1. ADITYA-L1 SUIT IMAGES – ISRO
COMPILED BY SANJOY SANYAL

2. DISCLAIMER
All material (Text, Images, Graphics etc.) in these slides have been procured from publicly available sources of ISRO and other
agencies, which includes ISRO partners. There are selected images from NASA also, where relevant, also procured from freely
available public resources. Instead of individually acknowledging each image they have been collectively credited through this
Disclaimer page. The author makes no copyright claims on any material.
They have been sorted, edited as relevant, collated and inserted to align them with the sequence of the slides, as deemed fit by
the author. They have been posted with academic altruism in mind, for those interested in Astrophysics and Astronomy and
related technology, like the author. There is no commercial or promotional motivation involved anywhere.
The author is not an Astrophysicist or an Astronomer. The author does not work for ISRO, NASA or any tech company. The author
is a nerd who loves technology, Astrophysics and Astronomy and who dabbles in related developments of ISRO, NASA etc. during
his spare time as an intellectual hobby. Thus, he satiates his academic appetite, learns in the process and wishes to share them
with like-minded people.
At the time of publication, all material has been updated and is deemed to be accurate. If any errors are detected by the
reader(s), I shall be happy to be corrected. The responsibility for any errors are solely mine and not that of the parent
organizations.
Here’s is wishing everyone a happy armchair space exploration on this occasion of New Year 2024!

3. SUIT PAYLOAD
Solar Ultraviolet Imaging Telescope (SUIT):
• Instrument on board Aditya-L1 Spacecraft has
successfully captured the first full-disk images of
the Sun in 200-400 nm Wavelength range
• SUIT captures images of the Sun's Photosphere
and Chromosphere in this wavelength range
using various Filters
20 November 2023: SUIT payload was powered ON
Successful pre-commissioning phase
6 December 2023: SUIT captured its first light
science images
Images: Taken using 11 different Filters (Slide 4),
include the first-ever full-disk representations of
the Sun in Wavelengths ranging from 200 to 400
nm, excluding Ca II h
Notable Features: Sunspots, Plage, and Quiet
Regions of Sun, as marked in Mg II h image (Slide
7), provide scientists with insights into the intricate
details of Sun's Photosphere and Chromosphere
SUIT observations will help scientists study the dynamic coupling of
magnetized solar atmosphere and assist them in determining the effects
of solar radiation on Earth's climate

4. ADITYA-L1 SUIT PARTNERS
Collaborative effort under leadership of Inter-University
Centre for Astronomy and Astrophysics (IUCAA), Pune.
This includes ff.
• Indian Space Research Organization (ISRO)
• Manipal Academy of Higher Education (MAHE)
• Centre for Excellence in Space Science Indian (CESSI),
IISER, Kolkata
• Indian Institute of Astrophysics (IIA), Bengaluru
• Udaipur Solar Observatory (USO)-Physics Research
Laboratory (PRL)
• Tezpur University Assam

5. FILTERS USED BY SUIT PAYLOAD – ISRO
Name of Filter (Emission Lines) Wavelength (nm) Features
NB1 214 Photosphere, Sunspot, Plages, Limb Darkening
NB2 276 Photosphere, Sunspot, Plages, Limb Darkening
NB3 (Mg II k) 279 Chromosphere, Sunspots, Plages, Quiet Sun, Filaments
NB4 (Mg II h) 280 Chromosphere, Sunspots, Plages, Quiet Sun, Filaments
NB5 283 Photosphere, Sunspot, Plages, Limb Darkening
NB6 300 Photosphere, Sunspot, Plages, Limb Darkening
NB7 388 Photosphere, Sunspot, Limb Darkening
NB8 (Ca II h) 396.8 Chromosphere, Sunspots, Plages, Quiet Sun,
BB1 200-242 Photosphere, Limb Darkening, Plages, Sunspots
BB2 242-300 Photosphere, Limb Darkening, Plages, Sunspots
• These illustrative images, taken using 11 different filters, include the first-ever full-disk representations of the Sun in
wavelengths ranging from 200 to 400 nm, excluding Ca II h. Full disk images of the Sun in Ca II h Wavelength have been
studied from other observatories
• Among the notable features revealed are Sunspots, Plage, Limb Darkening and Quiet Regions of Sun
• The decrease in intensity at visible wavelengths from the center of the Sun to the Limb (Edge) of the Sun’s Disk is called Limb
Darkening. The reason why the Limb appears darker compared to that of the center of the disks is that Stars have a
temperature gradient from the core to the surface

6. SUIT SHUTTER OPERATION – ISRO

7. SUN WITH NB1 – NB2 FILTERS
• Filter (Emission Lines): NB1, NB2
• Wavelength = 214 nm, 276 nm respectively
• Features: Photosphere, Sunspot, Plages, Limb Darkening

8. SUN WITH NB4 FILTER
• Filter (Emission Lines): NB4 (Mg II h)
• Wavelength = 280 nm
• Features: Chromosphere, Sunspot, Plages, Quiet Sun, Filaments

9. SUN WITH NB3 – NB8 FILTERS
• Filter (Emission Lines): NB3 (Mg II k), NB8 (Ca II h)
• Wavelength = 279 nm, 396.8 nm respectively
• Features: Chromosphere, Sunspot, Plages, Quiet Sun, Filaments

10. SUN WITH NB5 – NB6 FILTERS
• Filter (Emission Lines): NB5, NB6
• Wavelength = 283 nm, 300 nm respectively
• Features: Photosphere, Sunspot, Plages, Limb Darkening

11. SUN WITH BB1 – BB2 FILTERS
• Filter (Emission Lines): BB1, BB2
• Wavelength = 200-242 / 242-300 nm respectively
• Features: Photosphere, Limb Darkening, Plages, Sunspots

12. SUN WITH NB7 – BB3 FILTERS
• Filter (Emission Lines): NB7, BB3
• Wavelength = 388 nm, 320-360 nm respectively
• Features: Photosphere, Sunspot, Limb Darkening

13. FACULAE – SUNSPOTS – 2019 NASA
1st Pic: Sun seen in White Light (true color); 8 May 2019; 2nd Pic: Enlarged Rectangle
A. SUNSPOTS: 2 in Pic [Dark Areas of intense Magnetic Field]
• AR 2740 (Right Sunspot)
• AR 2741 (Left Sunspot)
B. FACULAE:
• Bright Areas; Seen near Limb or Edge of Solar Disk with High Zoom (1st Pic)
• Mechanism: Concentrations of Magnetic Field Lines
• Magnetic Field Lines are in smaller bundles than in Sunspots
• Make Sun look Brighter; Sunspots are Darker
 Appear in high concentrations during Solar Activity, w-/w-out Sunspots
 Faculae / Sunspots contribute noticeably to variations in ‘Solar Constant’
C. PLAGE: Chromosphere counterpart of Facula
D. GRANULES: Convection Cells across its surface (2nd Pic – Zoomed view)
E. WHITE SPOTS: Near AR 2741 (Left Sunspot; 2nd Pic)
F. LIMB DARKENING: Seen on Edge of Solar Disk with High Zoom (1st Pic)
AR 2741
AR 2740
White Spots (Faculae /
Plages)
Convection Cell
Granules all over