English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Despite the fact that pulsars have been observed for almost half a century,many questions have remained unanswered. We use the analysis of X-rayobservations in order to study the polar cap region of radio pulsars. The sizeof the hot spots implies that the magnetic field configuration just above thestellar surface differs significantly from a purely dipole one. We can estimatethe surface magnetic field as of the order of $10^{14}\,{\rm G}$. On the otherhand, the temperature of the hot spots is about a few million Kelvins. Based onthese two facts the Partially Screened Gap (PSG) model was proposed to describethe Inner Acceleration Region (IAR). The PSG model assumes that the temperatureof the actual polar cap is equal to the so-called critical value, i.e. thetemperature at which the outflow of thermal ions from the surface screens thegap completely.  We have found that, depending on the conditions above the polar cap, thegeneration of high energetic photons in IAR can be caused either by CurvatureRadiation (CR) or by Inverse Compton Scattering (ICS). This results in twodifferent scenarios of breaking the acceleration gap: the so-called PSG-offmode for CR-dominated gaps and the PSG-on mode ICS-dominated gaps. Theexistence of two different mechanisms of gap breakdown naturally explains themode-changing and the pulse nulling. Furthermore, the mode changes of the IARmay explain the anti-correlation of radio and X-ray emission in very recentobservations of PSR B0943+10 (Hermsen et al., 2013).  Simultaneous analysis of X-ray and radio properties have allowed to develop amodel which explains the drifting subpulse phenomenon. According to this modelthe drift takes place when the charge density in IAR differs from theGoldreich-Julian co-rotational density. The proposed model allows to verifyboth the radio drift parameters and X-ray efficiency of the observed pulsars.

Non-dipolar magnetic field at the polar cap of neutron stars and the physics of pulsar radiation