 The Sun in white light, 2005 April 16, a single 1/15-s exposure with a Canon-EOS 300D Digital Rebel AstroCamera (modified for astrophotography by Hutech) at ASA 100 through a Unitron 102-mm refractor at f/14.7 and a Thousand Oaks solar filter and unsharp masked by Frederick A. Ringwald.
|  Solar observing at the Vintage Days Fair, 2005 April 16, snapshot by Frederick A. Ringwald.  The Sun in H alpha light, 2005 April 16, full-color Registax stack of 70 (out of 328) x 1/30-s Philips ToUcam II exposures through a Coronado Helios 1 (70mm, f/5.7, 0.8nm bandpass) solar telescope and unsharp masked by Frederick A. Ringwald.
|  The Sun in H alpha light, 2005 April 16, full-color Registax stack of 71 (out of 321) x 1/30-s Philips ToUcam II exposures through a Coronado Helios 1 (70mm, f/5.7, 0.8nm bandpass) solar telescope and unsharp masked by Frederick A. Ringwald.
|  The Sun with three large sunspot groups in 2003 November, 1/8-s white-light exposure on 200-speed Kodak Gold 35-mm film through an Orion 90mm refractor and an Orion full-aperture glass solar filter at f/10 and unsharp-masked by Frederick A. Ringwald.
|  The Helios-1 solar telescope, 2008 April 19, with the Central Valley Astronomers during Vintage Days at Fresno State, snapshot by Frederick A. Ringwald.
|  The Sun with two sunspot groups on 2006 December 1, average of ten (out of 114) 1/160-s white-light exposures with a Canon-EOS 300D Digital Rebel AstroCamera (modified for astrophotography by Hutech) at ASA 100 through an Orion 90mm refractor and an Orion full-aperture glass solar filter at f/10 and wavelet processed by Frederick A. Ringwald.
|  The active Sun in H alpha, 2012 June 8, Registax composite of 169 (out of 305) exposures, with the prominences shot separately with 10x longer exposures, with a Lumenera SKYnyx 2-2 monochrome USB camera through a Coronado Helios 1 (70mm, f/5.7, 0.8nm bandpass) solar telescope and wavelet processed and colorized by Frederick A. Ringwald.
|  The active Sun in H alpha shown in a different color scheme, 2012 June 8, Registax composite of 169 (out of 305) exposures, with the prominences shot separately with 10x longer exposures, with a Lumenera SKYnyx 2-2 monochrome USB camera through a Coronado Helios 1 (70mm, f/5.7, 0.8nm bandpass) solar telescope and wavelet processed and colorized by Frederick A. Ringwald.
|  The Sun's atmosphere awakens as the Sun comes out of solar minimum, 2022 April 30 image in H alpha light, Registax composite of 529 exposures with the prominences shot separately with longer exposures with a Lumenera SKYnyx 2-2 monochrome USB camera through a Coronado Helios 1 (70mm, f/5.7, 0.8nm bandpass) solar telescope and wavelet processed and colorized by Frederick A. Ringwald.
|  The quiet Sun's lower chromosphere, 2009 July 6, full-color Registax stack from 300 x 1/12-s Orion Starshoot III exposures through a Coronado Ca K (70mm, f/5.7, 0.22nm bandpass centered at 393.4nm) solar telescope and wavelet processed by Frederick A. Ringwald.
|  The active Sun's lower chromosphere, 2012 June 5, full-color Registax stack of 300 x 1/12-s Orion Starshoot III exposures through a Coronado Ca K (70mm, f/5.7, 0.22nm bandpass centered at 393.4nm) solar telescope and wavelet processed by Frederick A. Ringwald.
|  Transit of Venus, 2012 June 5, full-color Registax stack of 300 x 1/12-s Orion Starshoot III exposures through a Coronado Ca K (70mm, f/5.7, 0.22nm bandpass centered at 393.4nm) solar telescope and wavelet processed by Frederick A. Ringwald.
|  The active Sun's lower chromosphere, 2012 July 2, Registax stack of 300 exposures with a Lumenera SKYnyx 2-2 monochrome USB camera through a Coronado Ca K (70mm, f/5.7, 0.22nm bandpass centered at 393.4nm) solar telescope and wavelet processed and colorized by Frederick A. Ringwald.
|  The biggest sunspot group in years in the light of Ca K, 2012 July 10, Registax stack of 300 exposures with a Lumenera SKYnyx 2-2 monochrome USB camera through a Coronado Ca K (70mm, f/5.7, 0.22nm bandpass centered at 393.4nm) solar telescope and wavelet processed and colorized by Frederick A. Ringwald.
|  The biggest sunspot group in years in white light, 2012 July 10, mosaic of four Registax stacks of 300 exposures with a Lumenera SKYnyx 2-2 monochrome USB camera through an Orion 90mm refractor and an Orion full-aperture glass solar filter at f/10 and wavelet processed and colorized by Frederick A. Ringwald.
|  The active Sun's chromosphere, 2024 April 20, Registax composite of over 300 exposures with the prominences shot separately with shorter exposures with a Lumenera SKYnyx 2-2 color USB camera through a Coronado Helios 1 (70mm, f/5.7, 0.8nm bandpass) solar telescope and wavelet processed by Frederick A. Ringwald.
|  The active Sun's lower chromosphere, 2024 April 20, Registax composite of over 300 exposures, with a Lumenera SKYnyx 2-2 color USB camera through a Coronado Ca K (70mm, f/5.7, 0.22nm bandpass centered at 393.4nm) solar telescope and wavelet processed by Frederick A. Ringwald.
|  The active Sun's photosphere, 2024 April 20, Registax stack of over 300 exposures with a Lumenera SKYnyx 2-2 color USB camera through an Orion 70mm f/7.1 White-Light Solar Refractor Telescope and wavelet processed by Frederick A. Ringwald.
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Last updated 2024 May 19. Web page by Professor Ringwald (ringwald[at]csufresno.edu and replace [at] with @)
Department of Physics, California State University, Fresno. Please read this disclaimer.