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Appendices 13-3 – BendixKing KHF 990 User Manual

Page 197

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radio bursts or SID observed or expected.

Moderate: Eruptive regions on the solar disk; fewer than five
class M x-ray events with centimetric radio bursts and SID
observed or expected.

High: Active regions on the solar disk; several class M x-ray
events with centimetric radio bursts and strong SID; and/or one
or two importance 2 chromospheric flares or class X x-ray
events observed or expected.

Very high: Region capable of producing protons on the sun;
one or more chromospheric flares of importance 2 or greater
with outstanding centimetric radio bursts (500 flux units or
greater), class x-ray bursts and major SID observed or
expected.

X-ray events:

Class C-any solar x-ray burst with a peak flux of 1-8 Å of
less than 10

-5

Watts M

-2

Class M-a solar x-ray burst with a peak flux at 1-8 Å greater
than or equal to 10

-5

but less than 10

-4

Watts M

-2

Class X-a solar x-ray burst with a peak flux at 1-8 Å greater
than or equal to 10

-4

Watts M

-2

B.2. Geomagnetic Field:

Quiet: A-Index

7; usually no K-indices >2

Unsettled: 7 < A-Index < 15; usually no K-indices > 3

Active: 15

A-Index < 30; a few K-indices of 4

B.3. Geomagnetic Storm:

Minor: 30

A-Index < 50; K-indices mostly 4 and 5

Major: A-Index

50; solar K-indices of 6 or greater

B.4. Major Solar Flare: A flare of optical importance

2B with a

centimetric radio burst of 500 flux units or more; or an X x-ray
event of duration

180 min. regardless of optical flare

importance.

B.5. Proton Flare: Protons by satellite detectors (or polar cap

absorption by riometer) have been observed in time
association with a chromospheric flare.

Appendices

13-3

KHF 950/990 Pilots Guide

Rev. 0
Dec/96