Uploaded August 2026 | Updated September 2026, 3 hours ago
- This animation demonstrates one of the most interesting features that can be revealed by tuning a hydrogen-alpha solar filter away from the center of the H-alpha line: an Ellerman bomb.
The sequence fades between two views of the same active region. One image was deliberately tuned into the wing of the H-alpha spectral line, while the other was taken on-band, near the H-alpha line center.
Watch the marked bright feature carefully.
In the off-band view, it appears as a conspicuous bright point. As the image fades into the on-band view, the feature becomes much less obvious and nearly disappears. When the off-band image returns, the bright feature becomes prominent again.
Ellerman bombs are small, transient brightenings associated with magnetic reconnection in the lower solar atmosphere, close to the photosphere. Because of where they form, they are most easily detected in the wings of H-alpha, while the H-alpha line center is dominated by structures higher in the chromosphere.
This is why tuning matters so much in solar imaging. Moving an H-alpha filter only a small distance in wavelength can dramatically change what layer of the Sun we are seeing and which structures become visible.
The same active region can therefore look very different depending on whether the filter is tuned:
- on the H-alpha line center
- into the blue wing
- or into the red wing
That ability to move through different parts of the spectral line is one of the things that makes narrowband solar observing so fascinating.
Captured in H-alpha by Mark Johnston / @azastroguy
🔭 Setup: TEC160FL/ERF/4x/solar spectrum 0.3A etalon/Player One IMX174 camera
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https://astroworldtelescopes.com?sca_...
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- This animation demonstrates one of the most interesting features that can be revealed by tuning a hydrogen-alpha solar filter away from the center of the H-alpha line: an Ellerman bomb.
The sequence fades between two views of the same active region. One image was deliberately tuned into the wing of the H-alpha spectral line, while the other was taken on-band, near the H-alpha line center.
Watch the marked bright feature carefully.
In the off-band view, it appears as a conspicuous bright point. As the image fades into the on-band view, the feature becomes much less obvious and nearly disappears. When the off-band image returns, the bright feature becomes prominent again.
Ellerman bombs are small, transient brightenings associated with magnetic reconnection in the lower solar atmosphere, close to the photosphere. Because of where they form, they are most easily detected in the wings of H-alpha, while the H-alpha line center is dominated by structures higher in the chromosphere.
This is why tuning matters so much in solar imaging. Moving an H-alpha filter only a small distance in wavelength can dramatically change what layer of the Sun we are seeing and which structures become visible.
The same active region can therefore look very different depending on whether the filter is tuned:
- on the H-alpha line center
- into the blue wing
- or into the red wing
That ability to move through different parts of the spectral line is one of the things that makes narrowband solar observing so fascinating.
Captured in H-alpha by Mark Johnston / @azastroguy
🔭 Setup: TEC160FL/ERF/4x/solar spectrum 0.3A etalon/Player One IMX174 camera
☀️ TAKE YOUR SOLAR OBSERVING TO THE NEXT LEVEL
The Solar Observer’s Handbook is my comprehensive, critically acclaimed guide to viewing, capturing, and processing the Sun.
📖 Available now in softcover, personally signed softcover, and PDF:
azastroguy.com/solar-handbook
🔔 SUBSCRIBE & JOIN THE CHANNEL
Subscribe for more solar time-lapses, tutorials, equipment discussions, and deep dives into our nearest star!
⭐ Become a YouTube Member for exclusive perks:
• Early access to new videos
• Live demonstrations & Q&A
• Discounts & preferred consideration for new content topics
👉 Click the "Join" button above to support the channel!
🔭 SOLAR EQUIPMENT LINKS
If you are considering buying a solar telescope or astronomy gear, using my affiliate links below supports this channel at no extra cost to you. I may receive a small commission from qualifying purchases:
• Agena Astro: bit.ly/3qfWaZS
• High Point Scientific: bit.ly/4p7f7HA
• Lunt Solar Systems: https://luntsolarsystems.com/?rfsn=87...
For Player One cameras and filters, I recommend AstroWorldTelescopes:
https://astroworldtelescopes.com?sca_...
☕ SUPPORT EDUCATIONAL CONTENT
Buy Me a Coffee: buymeacoffee.com/azastroguy
#SolarAstronomy #SolarImaging #Astrophotography #Telescope #Sun
