อภิธานศัพท์ฟิสิกส์ (อวกาศ)


อภิธานศัพท์ฟิสิกส์ (อวกาศ)
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H

H-ALPHA

This ABSORPTION LINE of neutral hydrogen falls in the red part of > the visible spectrum and is convenient for solar observations. The H-alpha line is universally used for patrol observations of solar flares.

H-component of the Geomagnetic Field

See GEOMAGNETIC ELEMENTS.

HIGH ENERGY EVENT

Flares (class two or more) with outstanding Centimetric Bursts and SID. High Energy Protons are reported at the Earth in case of most of these events occurring on the western part of solar disk. (Class X flares)

HIGH FREQUENCY (HF)

That portion of the radio frequency spectrum between between 3 and 30 MHz.

HIGH LATITUDES

With specific reference to zones of geomagnetic activity, "high latitudes" refers to 50o to 80o geomagnetic.

HIGH-SPEED STREAM

A feature of the SOLAR WIND having velocities that are about double average solar wind values.

HOMOLOGOUS FLARES

Solar flares that occur repetitively in the same ACTIVE REGION, with essentially the same position and with a common pattern of development.

HYDER FLARE

A FILAMENT-associated TWO-RIBBON FLARE, often occurring in spotless regions. The flare presumably results from the impact on the CHROMOSPHERE of infalling FILAMENT material.