The
Chromosphere
Chromospheric structures visible in Ha emission (filtergram)
• Region of
sun’s atmosphere just above
the photosphere.
• Visible, UV, and X-ray lines from highly ionized gases
• Temperature increases gradually from ≈ 4500 K to ≈ 10,000 K, then jumps to ≈ 1 million K
Transition region
Filaments
