NATURAL ELECTROMAGNETIC OSCILLATIONS IN 4–12 HZ FREQUENCY RANGE AS MEASURED BY SWARM SATELLITES AND CARISMA MAGNETOMETER NETWORK
Journal Title: Solar-Terrestrial Physics - Year 2023, Vol 9, Issue 3
Abstract
We examine magnetic field variations at 4–12 Hz frequencies in the upper ionosphere and on Earth. The ground response to the coherent oscillations at two SWARM satellites near and above the high frequency boundary of the nominal Pc1 range is studied. We use CARISMA data to analyze ground pulsations. Ionospheric oscillations are predominantly registered at geomagnetic latitudes above 65°, i. e. from the auroral zone to the polar cusp-cleft region. The oscillations at the same frequencies are recorded at auroral and subauroral ground stations at distances from 1500 to 3000 km from satellite footprint. Ratio RGI of the oscillation amplitude on Earth to that in the ionosphere retrieved from the observed data is compared to the values calculated for a finite radius Alfvén beam incident onto a quasi-real ionosphere. [Fedorov et al., 2018]. Radial distribution of RGI depends on the oscillation frequency and the altitude distribution of ionospheric parameters controlled mostly by season and local time. The most probable values of RGI range from 10–3 to 10–1. The RGI values obtained from the observed data agree with model ones at incident beam radius of about several hundred kilometers.
Authors and Affiliations
Yagova N. V. , Fedorov E. N. , Pilipenko V. A. , Mazur N. G.
Keywords
Related Articles
- EP ID EP722187
- DOI 10.12737/stp-93202314
- Views 53
- Downloads 0
CLASSIFICATION OF MAGNETOSPHERIC RESPONSES TO INTERACTION WITH DIAMAGNETIC STRUCTURES OF SLOW SOLAR WIND
We propose a possible classification of the responses of the magnetosphere to the interaction with diamagnetic structures (DS), which form the basis of the slow solar wind. The main determinants of the classification are...
RELATIONSHIP OF THE ASY-H INDEX WITH INTERPLANETARY MEDIUM PARAMETERS AND AURORAL ACTIVITY IN MAGNETIC STORM MAIN PHASES DURING CIR AND ICME EVENTS
In this study, we examine the relationship of the ASY-H index characterizing the partial ring current intensity with interplanetary medium parameters and auroral activity during the main phase of magnetic storms, induced...
CHARACTERISTICS OF DOUBLE SODIUM LAYER OVER HAIKOU, CHINA (20.0° N, 110.1° E)
We study the property of double sodium layer structures (DSLs) in the mesosphere and lower thermosphere (MLT) by a lidar at the low-latitude location of Haikou (20.0° N, 110.1° E), China. From April 2010 to December 2013...
IONOSPHERIC EFFECTS OF TWO SOLAR FLARES IN THE MAXIMUM OF SOLAR CYCLE 23 AND IN THE MINIMUM OF SOLAR CYCLE 24
Using data from the GPS and GLONASS navigation satellite systems, we analyze the responses of the mid-latitude ionosphere to the extreme solar flares that occurred at the maximum of solar cycle 23 (October 28, 2003) and...
PARTIAL PONDEROMOTIVE FORCES OF ALFVÉN WAVES IN NEAR-EARTH PLASMA
In the study of the ponderomotive action of Alfvén waves on near-Earth plasma, the general formula for ponderomotive forces, known in classical electrodynamics of continuous media, was previously used. The formula does n...