Identification

Title

Constraints imposed by the square-root spin-down law on coronal wind parameters

Abstract

We derive an explicit expression for the coronal wind mass-loss rate in terms of either the surface field or the surface rotation rate. This result is based on a currently used generalized torque interpolation formula (per unit rotational velocity) expressed as a product of known monomials, separately for the magnetic field and the mass-loss rate. The latter is assumed here to be given by an unknown monomial power of the magnetic field. This yields a torque dependent solely on the magnetic field that must yield the square-root spin-down law. A monomial field-rotation relation, defining the rotational power index for the field, is derived from the congruity of the decay with age of the observed Ca ii emission luminosity (with an arbitrary magnetic field power dependence) with the decay with age of the rotational velocity. This allows one to express the mass-loss rate power index in terms of the rotational index. We apply this constraining equation to a variety of observations. We find that even though there is considerable scatter in the data, there is sufficient observational evidence for the reality of a linear field-rotation relation associated with a linear temporal decay of the mass-loss rate.

Resource type

document

Resource locator

Unique resource identifier

code

http://n2t.net/ark:/85065/d7474dxc

codeSpace

Dataset language

eng

Spatial reference system

code identifying the spatial reference system

Classification of spatial data and services

Topic category

geoscientificInformation

Keywords

Keyword set

keyword value

Text

originating controlled vocabulary

title

Resource Type

reference date

date type

publication

effective date

2016-01-01T00:00:00Z

Geographic location

West bounding longitude

East bounding longitude

North bounding latitude

South bounding latitude

Temporal reference

Temporal extent

Begin position

End position

Dataset reference date

date type

publication

effective date

2019-06-11T00:00:00Z

Frequency of update

Quality and validity

Lineage

Conformity

Data format

name of format

version of format

Constraints related to access and use

Constraint set

Use constraints

Limitations on public access

None

Responsible organisations

Responsible party

contact position

OpenSky Support

organisation name

UCAR/NCAR - Library

full postal address

PO Box 3000

Boulder

80307-3000

email address

opensky@ucar.edu

web address

http://opensky.ucar.edu/

name: homepage

responsible party role

pointOfContact

Metadata on metadata

Metadata point of contact