DayStar Filters SolaREDi Handbuch - Seite 7

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Filaments

appear as large, dark eye-

brows across the surface of the Sun.

With a brightness of about 10% of the

disk due to scattering, they appear

dark on the surface, but on the limb,

show as a prominence. Active Region

Filaments (ARF) differ from Quiescent Region Filaments (QRF). ARF are darker, small-

er and have more coherent fibril structure along their axis. A sheared magnetic field

runs parallel to this axis, permitting a sizeable flare. QRF may produce a big Coronal

Mass Ejection (CME). An ARF may erupt and reform several times.

Plages:

Most of the active region area is occupied by plage. Considerable atmos-

pheric heating takes place in the

plage. It is bright in everything from

Halpha to the Calcium H and K lines.

This heating is thought to account for

an absence of spicule. While absent

over plage, spicule are prominent

around its edges.

Elerman Bomb:

A remarkable feature

of Emerging Flux Regions is the

Ellerman bomb. Bright points with very

broad H-alpha wings (±5Å) that are

low in the atmosphere so they are not

visible on H alpha centerline. Called 'moustaches' for their appearance on spectro-

graph, they appear spectroscopically like wide moustaches with a gap in the mid-

dle. This strange and tiny feature typically occurs at the center of the EFR or in the

edges of spots - where the field is breaking the surface.

Solar Flares

are intense, abrupt releases of energy which occur in areas where the

magnetic field is changing by flux

emergence

sunspot

motion.

Stresses in lines of force build up slow-

ly and are released in flares. They

occur most frequently at neutral lines

where a filament is supported by hor-

izontal sheared field lines. This event

can only take place along a magnetic inversion line. When many lines of force are

involved, two ribbons of emission appear, brightening simultaneously.

Emerging Flux Regions:

An area on the Sun where a magnetic dipole, or "flux tube"

is surfacing on the disk, eventually producing a bipolar sunspot group. Each pole of

an EFR is often marked by pores or

small developing sunspots. Surges or

even small solar flares can sometimes

occur in EFRs. An EFR emerges with

small bright H region with little surges,

then weak arch filaments (AFS) over

bright plage connect small spots on each dipole. Growth is rapid, forming in just a

few hours.

Operating temperature:

The SolaREDi is operable on-band in a tempera-

ture range of approximately 40°F. In climate conditions below the minimum

operating temperature of the SolaREDi, the filter will not operate on-band.

A heating strip can be applied at the barrel section containing the black

screw. This will allow users to increase the operative temperature range of

the instrument. DayStar filters recommends the Kendrick Astro Systems

product line, in particular, the Kendrick Firelite heater is a compact, inex-

pensive and effective accessory.

The SolaREDi telescope assembly may also change temperature and

require settling time when first removed from its storage and placed into

use.

Also, during the day, as the temperature of your SolaREDi telescope

increases, you may need to adjust the tuning action in order to stay at

6562.8Å.

Tuning / Tilting action:

The optical filter assembly stack is located in the

eyepiece barrel before the eye-

piece. It is mounted on pivot

points which allow the assembly

to tilt. The red headed thumb-

screw on the side of this barrel

will cause the optical assembly

to tilt, and change the wave-

length of light exiting the filter.

Your optical image will not

move or need re-focusing with

this tilt.

Filtration and safety:

The optical solar filter stack is mounted at the rear, eye-

piece end of the SolaREDi alpha telescope. Alone, it provides off-band

rejection density greater than 6.0 from X-ray to beyond 2 microns. This means

that it is safe to look directly into the rear of a properly assembled SolaREDi

alpha telescope without an eyepiece.

requires no additional blocking filters or special diagonals or eyepieces and

unless it is disassembled with tools, the telescope cannot be rendered unsafe.

Should any element of the filter age or degrade, that degradation would

cause a darkening of the image and not an unsafe filtration.

The SolaREDi alpha telescope