วันพฤหัสบดี, 25 เมษายน 2024, 2:11AM
เว็บไซต์: Moodle - Open-source learning platform | Moodle.org
รายวิชา: Moodle in Thailand (Moodle in Thailand)
อภิธานศัพท์: อภิธานศัพท์ฟิสิกส์ (อวกาศ)
M
M 3000 The optimum HIGH FREQUENCY radio wave with a 3000 km range, which
reflects only once from the IONOSPHERE (single hop transmission).
|
MAGFLARE A geomagnetic and/or cosmic storm has been associated with this
flare.
|
MAGNETIC BAY A relatively smooth excursion of the H (horizontal) component
(see GEOMAGNETIC ELEMENTS) of the geomagnetic field away from and
returning to quiet levels.
|
MAGNETOGRAM Solar magnetograms are a graphic representation of solar mag-
netic field strengths and polarity.
|
MAGNETOPAUSE The boundary layer between the SOLAR WIND and the MAGNETO-
SPHERE.
|
MAGNETOSPHERE The magnetic cavity surrounding the earth, carved out of the
passing SOLAR WIND by virtue of the GEOMAGNETIC FIELD, which pre-
vents, or at least impedes, the direct entry of the SOLAR WIND
PLASMA into the cavity.
|
MAJORFLARE This flare is the basis for the forecast of geomagstorm, cosmic
storm and/or protons in the earth's vicinity.
|
MEDIUM FREQUENCY. (MF) That portion of the radio frequency spectrum from 0.3
to 3 MHz.
|
MeV Mega (million) electronvolt. A unit of energy used to describe the
total energy carried by a particle or photon.
|
MICROWAVE BURST A radiowave signal associated with optical and/or X-ray
FLAREs.
|
MIDDLE LATITUDES With specific reference to zones of geomagnetic activity,
"middle latitudes" refers to 20 deg. to 50 deg. geomagnetic.
|
MOUNT WILSON MAGNETIC CLASSIFICATIONS
Alpha. Denotes a unipolar SUNSPOT group.
Beta. A sunspot group having both positive and negative mag-
netic polarities, with a simple and distinct division between
the polarities.
Beta-Gamma. A sunspot group that is bipolar but in which no
continuous line can be drawn separating spots of opposite
polarities.
Delta. A complex magnetic configuration of a solar sunspot
group consisting of opposite polarity UMBRAe within the same
PENUMBRA.
Gamma. A complex ACTIVE REGION in which the positive and nega-
tive polarities are so irregularly distributed as to prevent
classification as a bipolar group.
|