The evershed flow in the solar photosphere, chromosphere and chromosphere-corona transition region

Title:

The evershed flow in the solar photosphere, chromosphere and chromosphere-corona transition region

Creator:

Alissandrakis, C. E., Dialetis, D., Mein, P., Schmieder, B., and Simon, G.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:2f463d2f-e8da-470a-9daa-a957c2303ae7
uuid:2f463d2f-e8da-470a-9daa-a957c2303ae7

Subject:

astrophysics, sunspot regions, and evershed flow

Type:

model:article and TEXT

Format:

bez média and svazek

Description:

We have studied the height dependent characteristics of the Evershed flow in the photosphere, chromosphere and chromosphere-corona transition region. We have used the Multichannel Subtractive Double Pass Spectrograph (MSDP) to obtain line of sight velocity maps in Hα, the Meudon magnetograph for mapping the photospheric velocity field and the Ultraviolet Spectrometer and Polarimeter (UVSP) on the Solar Maximum Mission (SMM) spacecraft to obtain line of sight velocities in C IV, in sunspot regions. Our emphasis was on the large scale, quasi-stationary characteristics of the flow. In the photosphere the velocity is low above the umbra and shows a maximum above the penumbra. In addition to the reversal of the flow in the chromosphere both the characteristic scale of the flow and the velocity are larger; the velocity maximum is located outside the photospheric penumbra. In the chromosphere-corona transition region there is a clear tendency for a chromospheric-type Evershed effect with a predominantly horizontal flow. The velocity is greater than in the chromosphere, but the characteristic scale of the flow is about the same. In addition to the Evershed flow, C IV observations show upflows above the umbra with a velocity of about 15 km/sec.

Language:

Czech

Rights:

http://creativecommons.org/publicdomain/mark/1.0/
policy:public

Coverage:

147-151

Source:

Publications of the Astronomical Institute of the Academy of Sciences of the Czech Republic | 1987 Volume:63-70 | Number:66

Harvested from:

CDK

Metadata only:

false