Characteristics of chromospheric Ca II jets

1
Characteristics of chromospheric Ca II
jets guessed from line-profiles
Purpose Relation among chromospheric
jet-like phenomena, magnetic reconnection and
coronal heating
Jet-like phenomena
1) Small cusp-shaped jets in active regions 2)
High-speed jet-like phenomena in the upper
chromosphere at quiet region 3) Jets on the limb
(macro-spicules, surges)
2
(1) Small cusp-shaped jets in active regions
Spatial position (19.4 14.1Mm)
Time (467 s)011327 - 012074
3
Hida/DST (VS) Ca II HSpectroheliogramCa II h3 -
0.5 Å
HINODE/SOT Ca II H
4
Guessed atmospheric structure of fitted
line-profile(bold curves jet, thin curves
quiet region)
5
(2) High-speed jet-like phenomena in the
upper chromosphere at quiet region
2007. 08. 15023827 UT (X,Y)(523,-31)
Yellow square FOV of SOT/Ca H Filtergram

• - High frequency in the quiet region
• High transversal velocity ( 100 km/s)
• Short lifetime (0.5 - 2 min)
• At the higher layer, the contrast is also
  higher.

6
Spectrum line-profile at the brightest point in
the jet(bold curve jet, thin curve quiet
region)
Jet (?) ???????????MULTI ??? ?????????
- Fitted profile calculated with MULTI-code
Observed profiles
- The profile of this phenomenon mostly has the
similar shape to this. - At the photosphere (at
the wing), the profile is almost the same as
the quiet-region profile.
7
Guessed atmospheric structure of fitted
line-profile (thin curves jet, bold curves
quiet region)
Doppler Velocity
upward
ReconnectionPoint ?
downward

• Downflow is shown in entire chromosphere (max
  25 km/s).
• Physical values except for the velocity are not
  greatly different from quiet region.
• Magnetic reconnection occurs at further higher
  atmosphere?
• gt More analyses of EIS, XRT etc. are needed.

8
(3) Jets on the limb (macro-spicules, surges)
2007-08-06 003710 UT
HINODE/SOT Ca II H
Spatial position (24.2 17.5Mm)
Time (903 s)002840 - 004343
9
Hida/DST Ca II H Spectroheliogram (line center)
2007.08.06 003715 - 003953 UT
003715
003739
003918
003942
003953
10
Time variation of Doppler velocity map(from Ca
II H spectroheliograms)
Time variation of Doppler width map(from Ca II H
spectroheliograms)