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Showing 1 to 20 of 38 for “"Solar Cycle"”.
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The variation of coronal holes with solar cycle
… of the open magnetic flux and the high-speed solar wind. In EUV and X-ray emission lines, coronal holes are seen as the regions with reduced emission due to lower temperatures and electron density than the surrounding quiet sun. Observing the evolution of coronal holes over the course of a …
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The Effect of the Solar Cycle on Satellite Orbital Lifetime
… Low Earth Orbit (LEO) is affected by the 11-year solar cycle. At a fixed altitude, increasing solar activity increases atmospheric density which leads to an increase in drag, and a decrease in mission lifetime without using propulsion to recover altitude. Satellites may have longer orbital …
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On the Variation of Gravity Wave Activity through the Solar Cycle at the South Pole
… driver of atmospheric dynamics. The 11-year solar cycle of the sun has had a noticeable effect on the overall climate of the earth in the past. More recent work has seen the diurnal tides being directly influenced by the change in solar energy over the solar cycle at the South Pole. The …
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Characterisation of ionospheric TEC variations over the equatorial and polar regions during solar cycle 24
The TEC variations in the equatorial and polar region are known to be high compared to the mid latitude region. Investigation on ionospheric TEC at individual regions has been carried out by many studies but the investigation between these regions simultaneously is still lacking. TEC values from …
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Chemistry-climate modelling studies of decadal and interdecadal variability in stratospheric ozone and climate: The 11-year solar cycle and future ozone recovery
… to the atmospheric response to the 11-year solar cycle forcing and future stratospheric ozone recovery. Firstly, following recent improvements in the model, the atmospheric response to the solar cycle forcing simulated in UMUKCA is discussed. It is shown that while some features show a broad …
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SOLAR MODULATION OF GALACTIC COSMIC RAYS: TECHNIQUES & APPLICATIONS (SHOCK ACCELERATION, ANTIPROTONS)
… the time-dependent, spherically-symmetric, solar modulation of galactic cosmic rays. A numerical technique was introduced for the solution of this problem. A model for the solar-cycle variation in cosmic-ray intensity illustrated this method, using enhanced particle scattering regions. This …
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Data management of geostationary communication satellite telemetry and correlation to space weather observations
… (SEUs). We first compare SSPA anomalies to the solar and geomagnetic cycle. We find most SSPA anomalies occur as solar activity declines, and when geomagnetic activity is low. We compare GOES 2 MeV electron flux and SSPA current for two weeks surrounding each anomaly. Seventeen of the 26 SSPA …
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Policy and Design Courses of Action to Improve Resilience of Proliferated Low Earth Orbit Constellations Against Adverse Solar Weather
… proliferation alter resilience to adverse solar weather? And 3) How do increasing levels of constellation proliferation alter the effectiveness of courses of action to improve resilience? In order to answer these questions, solar weather effects are modeled using a unique process of …
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Statistical study of oxygen+ transport from the cusp to the plasmasheet
… the combination of the convection driven by the solar wind and the coupling with the ionosphere. By comparing the normalized distributions of the cusp outflow and the streaming O+ in the magnetotail we show that the increase in the energy of the streaming O+ in the tail lobes is mainly due to the …
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Synoptic variability of a CIR-driven open-closed boundary during solar minimum
… year 2008 marked a historically quiet period of solar activity during the declining phase of solar cycle 23. Such quiet time has permitted researchers to clearly distinguish the spectral signature of a corotating interaction region's (CIR) impact on the open-closed boundary (OCB) of the …
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Detection of Solar Prominences using Automated Methods and Analysis of their Dynamic Pre-Eruptive Behaviour
Solar prominences, or filaments when viewed on the disk, are cool, dense plasma structures in the solar corona. Prominences are of great interest for space weather and can be seen as a natural laboratory to explore concepts of plasma physics and magnetism. The eruption of prominences can have a …
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Peramalan jumlah kandungan elektron menggunakan kaedah suapan ke hadapan rangkaian neural di Semenanjung Malaysia
… over Peninsular Malaysia, which is ascending solar cycle on solar cycle 24. TEC values and the factors that influence its variability as dependent and independent variable respectively, the capabilities of NN for TEC modelling were investigated. For this purpose, TEC was modelled as a function …
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Searching for planets
… data, in an effort to find evidence for extra-solar planets.Although no such evidence was found we do find that about one half of the HF programstars show significant secular trends in their radial velocities, which may indicate signalsat periods longer than we are currently sensitive to. …
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Geomagnetically induced currents and its presence in the Eskom transmission network
… due to geomagnetic activity during the previous solar cycle peak.
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ΔΥΝΑΜΙΚΟΙ ΚΑΙ ΦΥΣΙΚΟΙ ΠΑΡΑΓΟΝΤΕΣ ΠΟΥ ΔΙΑΜΟΡΦΩΝΟΥΝ ΤΗΝ ΗΜΕΡΗΣΙΑ ΚΥΜΑΝΣΗ ΤΗΣ ΠΙΕΣΗΣ ΚΟΝΤΑ ΣΤΟ ΕΔΑΦΟΣ ΣΤΟΝ ΕΛΛΗΝΙΚΟ ΧΩΡΟ
… THE RESULTS ARE EXTENDED USING THE TOTAL SOLAR RADIATION, THE HUMIDITY OF THE TROPOSPHERE, THE LATENT HEAT OF CONDENSATION AND MANY LOCAL PHENOMENA. THE RELATION BETWEEN SEA BREEZE AND 1ST HARMONIC IS EXAMINED. FINALLY THE VARIATION OF DAILY MARCHING OF PRESSURE WITH ALTITUDE IS STUDIED. …
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Planetary Wave Activity Observed in Polar Mesospheric Clouds
<p>In this paper, the Solar Backscatter UV spectrometer (SBUV) Polar Mesospheric Cloud (PMC) dataset was investigated for planetary wave activity following the earlier study by <em>Merkel </em>[2002]. To counter the sparse nature of the data, four separate methods of analysis are used in …
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Solar eclipse observation on may 21, 2012 from JVLA
The annular solar eclipse occurred on May 21, 2012 is studied using the radio data from the Jansky Very Large Array (JVLA), Sorrocco, Mexico. The eclipse is observed in the solar minimum activity period of solar cycle 24. The centimeter wavelength observation of the Sun's surface during the solar …
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The Interstellar Transport of Galactic Cosmic Rays
… These results cover observations during two solar minimum periods of the solar cycle, the most recent of which exhibited very low levels of solar activity and the highest galactic cosmic-ray intensities of the space era. Observations of secondary cosmic-ray species, those produced primarily …
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Magnetic reconnection in small and large scales on the sun
Almost all solar activities observed are related to the solar magnetic field, especially the topological restructuring of magnetic fields, the so-called magnetic reconnection in solar physics. They are occurring at different scales related to various phenomena, during minimum or maximum of the …
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Molecular Mechanisms of Melatonin Action on the Rat Suprachiasmatic Nucleus: An in Vitro Analysis
… and metabolism are synchronized to the solar cycle by the suprachiasmatic nucleus (SCN) of the mammalian brain. Cells of the SCN undergo a near 24-hour pattern of cellular events that convey time-of-day information to target organs. The endogenous nature of this dock is based in a …
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